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-// license:BSD-3-Clause
-// copyright-holders:F. Ulivi
-/*********************************************************************
-
- hp_taco.cpp
-
- HP TApe COntroller (5006-3012)
-
-*********************************************************************/
-
-// This device has been reverse engineered entirely through documents & study of HP software.
-// I had no access to the real device to experiment.
-// Available documentation on the internal working of TACO chip is close to nothing. The best
-// I could find is [1] (see below) where all that's described is a (too) brief summary of registers and little else.
-// In other words, no description of the commands that can be issued to TACO chips.
-// So, my main source of information was the careful study of HP software, especially the 9845 system test ROM (09845-66520).
-// The second half of this ROM holds a comprehensive set of tape drive tests.
-// The main shortcomings of my approach are:
-// * I could indentify only those TACO commands that are actually used by the software. I managed
-// to identify 17 out of 32 possible commands. The purpose of the rest of commands is anyone's guess.
-// * I could only guess the behavior of TACO chips in corner cases (especially behavior in various error/abnormal
-// conditions)
-//
-// Documentation I used:
-// [1] HP, manual 64940-90905, may 80 rev. - Model 64940A tape control & drive service manual
-// [2] US patent 4,075,679 describing HP9825 system (this system had a discrete implementation of tape controller). The
-// firmware listing was quite useful in identifying sequences of commands (for example how to find a specific sector etc.).
-// [3] http://www.hp9845.net site
-// [4] April 1978 issue of HP Journal. There is a one-page summary of TACO chip on page 20.
-
-// This is an overview of the TACO/CPU interface.
-//
-// Reg. | R/W | Content
-// =====================
-// R4 | R/W | Data register: words read/written to/from tape pass through this register
-// R5 | R/W | Command and status register (see below)
-// R6 | R/W | Tachometer register. Writing it sets a pulse counter that counts up on either tachometer pulses or IRGs, depending
-// | | on command. When the counter rolls over from 0xffff to 0 it typically ends the command. It's not clear to me
-// | | what value could be read from this register, if it's just the same value that was written last time or the internal
-// | | counter or something else entirely.
-// R7 | R | Checksum register. Reading it clears it.
-// R7 | W | Timing register. It controls somehow the encoding and decoding of bits. For now I completely ignore it because its
-// | | content it's totally unknown to me. It seems safe to do so, anyway. I can see that it's always set to 0x661d before
-// | | writing to tape and to 0x0635 before reading.
-//
-// Format of TACO command/status register (R5)
-// Bit R/W Content
-// ===============
-// 15 RW Tape direction (1 = forward)
-// 14..10 RW Command (see the "enum" below)
-// 9 RW ? Drive ON according to [1], the actual use seems to be selection of gap length
-// 8 RW ? Size of gaps according to [1], N/U in my opinion
-// 7 RW Speed of tape (1 = 90 ips, 0 = 22 ips)
-// 6 RW Option bit for various commands
-// 5 R Current track (1 = B)
-// 4 R Gap detected (1)
-// 3 R Write protection (1)
-// 2 R Servo failure (1)
-// 1 R Cartridge out (1)
-// 0 R Hole detected (1)
-
-// Here's a summary of the on-tape format of HP9845 systems.
-// * A tape has two independent tracks (A & B).
-// * Each track holds 426 sectors.
-// * Each sector has an header and 256 bytes of payload (see below)
-// * Sectors are separated by gaps of uniform magnetization called IRGs (Inter-Record Gaps)
-// * The basic unit of data I/O are 16-bit words
-// * Bits are encoded by different distances between magnetic flux reversals
-// * The structure of tracks is:
-// - Begin of tape holes
-// - The deadzone: 350x 0xffff words
-// - 1" of IRG
-// - Sector #0 (track A) or #426 (track B)
-// - 1" of IRG (2.5" on track A)
-// - Sector #1 (track A) or #427 (track B)
-// - 1" of IRG
-// - Sector #2 (track A) or #428 (track B)
-// - ...and so on up to sector #425/#851
-// - 6" of final gap
-// - Non-recorded tape
-// - End of tape holes
-// * Sector #0 is not used
-// * Sectors #1 and #2 hold the first copy of tape directory
-// * Sectors #3 and #4 hold the second/backup copy of tape directory
-// * User data are stored starting from sector #5
-// * There is no "fragmentation" map (like file allocation table in FAT filesystem): a file
-// spanning more than 1 sector always occupy a single block of contiguous sectors.
-//
-// A sector is structured like this:
-// Word 0: Invisible preamble word (always 0). Preamble comes from 9825, don't know if it's
-// actually there in TACO encoding. I assumed it is.
-// Word 1: Format/sector in use and other unidentified bits.
-// Word 2: Sector number
-// Word 3: Sector length and other bits
-// Word 4: Checksum (sum of words 1..3)
-// Words 5..132: Payload
-// Word 133: Checksum (sum of words 5..132)
-//
-// Physical encoding of words is borrowed from 9825 as I wasn't able
-// to gather any info on the actual encoding of TACO chips.
-// This is how 9825 encodes words on tape:
-// - the unit of encoding are 16-bit words
-// - each word is encoded from MSB to LSB
-// - each word has an extra invisible "1" encoded at the end
-// - tape is read/written at slow speed only (21.98 ips)
-// - a 0 is encoded with a distance between flux reversals of 1/35200 s
-// (giving a maximum density of about 1600 reversals per inch)
-// - a 1 is encoded with a distance that's 1.75 times that of a 0
-//
-// This driver is based on the following model of the actual TACO/tape system:
-// * Tape immediately reaches working speed (no spin-up time)
-// * Inversion of tape direction and change of speed are immediate as well
-// * Time & distance to stop the tape are modeled, though. Firmware is upset by
-// a tape with null braking time/distance.
-// * Speed of tape is exceptionally accurate. Real tape was controlled by a closed loop
-// with something like 1% accuracy on speed.
-// * Storage is modeled by one "map" data structure per track. Each map maps the tape position
-// to the 16-bit word stored at that position. Gaps are modeled by lack of data in the map.
-// There is no model of the physical encoding of bits (except to compute how long each word
-// is on tape).
-// * Read threshold is ignored. Real tapes could be read with either a low or high threshold.
-// * "Flag" bit is used as a busy/ready signal in real TACO. Here I assumed the device is
-// always ready, so Flag is always active.
-// * I tried to fill the (many) gaps on chip behavior with "sensible" solutions. I could only
-// validate my solutions by running the original firmware in MAME, though (no real hw at hand).
-//
-// TODOs/issues:
-// * Some code cleanup
-// * Handling of tape holes seems to be wrong: test "C" of test ROM only works partially
-// * Find out what is read from register R6
-// * Handle device_image_interface::call_display to show state of tape
-// * Find more info on TACO chips (does anyone with a working 9845 or access to internal HP docs want to
-// help me here, please?)
-//
-#include "emu.h"
-#include "hp_taco.h"
-
-// Debugging
-#define VERBOSE 1
-#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
-#define VERBOSE_0 0
-#define LOG_0(x) do { if (VERBOSE_0) logerror x; } while (0)
-
-// Macros to clear/set single bits
-#define BIT_MASK(n) (1U << (n))
-#define BIT_CLR(w , n) ((w) &= ~BIT_MASK(n))
-#define BIT_SET(w , n) ((w) |= BIT_MASK(n))
-
-// Timers
-enum {
- TAPE_TMR_ID,
- HOLE_TMR_ID
-};
-
-// Constants
-#define CMD_REG_MASK 0xffc0 // Command register mask
-#define STATUS_REG_MASK 0x003f // Status register mask
-#define TACH_TICKS_PER_INCH 968 // Tachometer pulses per inch of tape movement
-#define TAPE_POS_FRACT 1024 // 10 bits of fractional part in tape_pos_t
-#define ONE_INCH_POS (TACH_TICKS_PER_INCH * TAPE_POS_FRACT) // Value in tape_pos_t representing 1 inch of tape
-#define TACH_FREQ_SLOW 21276 // Tachometer pulse frequency for slow speed (21.98 ips)
-#define TACH_FREQ_FAST 87196 // Tachometer pulse frequency for fast speed (90.08 ips)
-#define TAPE_LENGTH ((140 * 12 + 72 * 2) * ONE_INCH_POS) // Tape length: 140 ft of usable tape + 72" of punched tape at either end
-#define TAPE_INIT_POS (80 * ONE_INCH_POS) // Initial tape position: 80" from beginning (just past the punched part)
-#define ZERO_BIT_LEN 619 // Length of 0 bits at slow tape speed: 1/(35200 Hz)
-#define ONE_BIT_LEN 1083 // Length of 1 bits at slow tape speed: 1.75 times ZERO_BIT_LEN
-#define QUICK_CMD_USEC 25 // usec for "quick" command execution
-#define FAST_BRAKE_MSEC 73 // Braking time from fast speed to stop (2 ips) in msec (deceleration is 1200 in/s^2)
-#define SLOW_BRAKE_MSEC 17 // Braking time from slow speed to stop in msec
-#define FAST_BRAKE_DIST 3350450 // Braking distance at fast speed (~3.38 in)
-#define SLOW_BRAKE_DIST 197883 // Braking distance at slow speed (~0.2 in)
-#define PREAMBLE_WORD 0 // Value of preamble word
-#define END_GAP_LENGTH (6 * ONE_INCH_POS) // Length of final gap: 6"
-#define MIN_IRG_LENGTH ((tape_pos_t)(0.2 * ONE_INCH_POS)) // Minimum length of IRGs: 0.2" (from 9825, not sure about value in TACO)
-#define NULL_TAPE_POS ((tape_pos_t)-1) // Special value for invalid/unknown tape position
-#define NO_DATA_GAP (17 * ONE_BIT_LEN) // Minimum gap size to detect end of data: length of longest word (0xffff)
-#define FILE_MAGIC 0x4f434154 // Magic value at start of image file: "TACO"
-
-// Parts of command register
-#define CMD_CODE(reg) \
- (((reg) >> 10) & 0x1f)
-#define DIR_FWD(reg) \
- (BIT(reg , 15))
-#define SPEED_FAST(reg) \
- (BIT(reg , 7))
-#define CMD_OPT(reg) \
- (BIT(reg , 6))
-#define UNKNOWN_B9(reg) \
- (BIT(reg , 9))
-#define DIR_FWD_MASK BIT_MASK(15) // Direction = forward
-#define SPEED_FAST_MASK BIT_MASK(7) // Speed = fast
-
-// Commands
-enum {
- CMD_INDTA_INGAP, // 00: scan for data first then for gap
- CMD_UNK_01, // 01: unknown
- CMD_FINAL_GAP, // 02: write final gap
- CMD_INIT_WRITE, // 03: write words for tape formatting
- CMD_STOP, // 04: stop
- CMD_UNK_05, // 05: unknown
- CMD_SET_TRACK, // 06: set A/B track
- CMD_UNK_07, // 07: unknown
- CMD_UNK_08, // 08: unknown
- CMD_UNK_09, // 09: unknown
- CMD_MOVE, // 0a: move tape
- CMD_UNK_0b, // 0b: unknown
- CMD_INGAP_MOVE, // 0c: scan for gap then move a bit further (used to gain some margin when inverting tape movement)
- CMD_UNK_0d, // 0d: unknown
- CMD_CLEAR, // 0e: clear errors/unlatch status bits
- CMD_UNK_0f, // 0f: unknown
- CMD_NOT_INDTA, // 10: scan for end of data
- CMD_UNK_11, // 11: unknown
- CMD_UNK_12, // 12: unknown
- CMD_UNK_13, // 13: unknown
- CMD_UNK_14, // 14: unknown
- CMD_UNK_15, // 15: unknown
- CMD_WRITE_IRG, // 16: write inter-record gap
- CMD_UNK_17, // 17: unknown
- CMD_SCAN_RECORDS, // 18: scan records (count IRGs)
- CMD_RECORD_WRITE, // 19: write record words
- CMD_MOVE_INDTA, // 1a: move then scan for data
- CMD_UNK_1b, // 1b: unknown (for now it seems harmless to handle it as NOP)
- CMD_DELTA_MOVE_HOLE, // 1c: move tape a given distance, intr at end or first hole found (whichever comes first)
- CMD_START_READ, // 1d: start record reading
- CMD_DELTA_MOVE_IRG, // 1e: move tape a given distance, detect gaps in parallel
- CMD_END_READ // 1f: stop reading
-};
-
-// Bits of status register
-#define STATUS_HOLE_BIT 0 // Hole detected
-#define STATUS_CART_OUT_BIT 1 // Cartridge out
-#define STATUS_SFAIL_BIT 2 // Servo failure
-#define STATUS_WPR_BIT 3 // Write protection
-#define STATUS_GAP_BIT 4 // Gap detected
-#define STATUS_TRACKB_BIT 5 // Track B selected
-#define STATUS_CART_OUT_MASK BIT_MASK(STATUS_CART_OUT_BIT) // Cartridge out
-#define STATUS_WPR_MASK BIT_MASK(STATUS_WPR_BIT) // Write protection
-#define STATUS_ERR_MASK (STATUS_CART_OUT_MASK) // Mask of errors in status reg.
-
-// *** Position of tape holes ***
-// At beginning of tape:
-// *START*
-// |<-----24"----->|<---12"--->|<---12"--->|<-----24"----->|
-// O O O O O O O
-// |<->| |<->| |<->|
-// 0.218" 0.218" 0.218"
-// At end of tape:
-// *END*
-// |<-----24"----->|<---12"--->|<---12"--->|<-----24"----->|
-// O O O O
-//
-static const hp_taco_device::tape_pos_t tape_holes[] = {
- (hp_taco_device::tape_pos_t)(23.891 * ONE_INCH_POS), // 24 - 0.218 / 2
- (hp_taco_device::tape_pos_t)(24.109 * ONE_INCH_POS), // 24 + 0.218 / 2
- (hp_taco_device::tape_pos_t)(35.891 * ONE_INCH_POS), // 36 - 0.218 / 2
- (hp_taco_device::tape_pos_t)(36.109 * ONE_INCH_POS), // 36 + 0.218 / 2
- (hp_taco_device::tape_pos_t)(47.891 * ONE_INCH_POS), // 48 - 0.218 / 2
- (hp_taco_device::tape_pos_t)(48.109 * ONE_INCH_POS), // 48 + 0.218 / 2
- 72 * ONE_INCH_POS, // 72
- 1752 * ONE_INCH_POS, // 1752
- 1776 * ONE_INCH_POS, // 1776
- 1788 * ONE_INCH_POS, // 1788
- 1800 * ONE_INCH_POS // 1800
-};
-
-// Device type definition
-const device_type HP_TACO = &device_creator<hp_taco_device>;
-
-// Constructors
-hp_taco_device::hp_taco_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname)
- : device_t(mconfig, type, name, tag, owner, clock, shortname, __FILE__),
- device_image_interface(mconfig , *this),
- m_irq_handler(*this),
- m_flg_handler(*this),
- m_sts_handler(*this),
- m_tape_pos(TAPE_INIT_POS),
- m_image_dirty(false)
-{
- clear_state();
-}
-
-hp_taco_device::hp_taco_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
- : device_t(mconfig, HP_TACO, "HP TACO", tag, owner, clock, "TACO", __FILE__),
- device_image_interface(mconfig , *this),
- m_irq_handler(*this),
- m_flg_handler(*this),
- m_sts_handler(*this),
- m_tape_pos(TAPE_INIT_POS),
- m_image_dirty(false)
-{
- clear_state();
-}
-
-WRITE16_MEMBER(hp_taco_device::reg_w)
-{
- LOG_0(("wr R%u = %04x\n", 4 + offset , data));
-
- // Any I/O activity clears IRQ
- irq_w(false);
-
- switch (offset) {
- case 0:
- // Data register
- m_data_reg = data;
- m_data_reg_full = true;
- break;
-
- case 1:
- // Command register
- start_cmd_exec(data & CMD_REG_MASK);
- break;
-
- case 2:
- // Tachometer register
- m_tach_reg = data;
- break;
-
- case 3:
- // Timing register
- m_timing_reg = data;
- break;
- }
-}
-
-READ16_MEMBER(hp_taco_device::reg_r)
-{
- UINT16 res = 0;
-
- // Any I/O activity clears IRQ
- irq_w(false);
-
- switch (offset) {
- case 0:
- // Data register
- res = m_data_reg;
- break;
-
- case 1:
- // Command & status register
- res = (m_cmd_reg & CMD_REG_MASK) | (m_status_reg & STATUS_REG_MASK);
- break;
-
- case 2:
- // Tachometer register
- res = m_tach_reg;
- break;
-
- case 3:
- // Checksum register: it clears when read
- res = m_checksum_reg;
- m_checksum_reg = 0;
- break;
- }
-
- LOG_0(("rd R%u = %04x\n", 4 + offset , res));
-
- return res;
-}
-
-READ_LINE_MEMBER(hp_taco_device::flg_r)
-{
- return m_flg;
-}
-
-READ_LINE_MEMBER(hp_taco_device::sts_r)
-{
- return m_sts;
-}
-
-// device_config_complete
-void hp_taco_device::device_config_complete()
-{
- LOG(("device_config_complete"));
- update_names();
-}
-
-// device_start
-void hp_taco_device::device_start()
-{
- LOG(("device_start"));
- m_irq_handler.resolve_safe();
- m_flg_handler.resolve_safe();
- m_sts_handler.resolve_safe();
-
- save_item(NAME(m_data_reg));
- save_item(NAME(m_data_reg_full));
- save_item(NAME(m_cmd_reg));
- save_item(NAME(m_cmd_state));
- save_item(NAME(m_status_reg));
- save_item(NAME(m_tach_reg));
- save_item(NAME(m_checksum_reg));
- save_item(NAME(m_timing_reg));
- save_item(NAME(m_irq));
- save_item(NAME(m_flg));
- save_item(NAME(m_sts));
- save_item(NAME(m_tape_pos));
- save_item(NAME(m_start_time));
- save_item(NAME(m_tape_fwd));
- save_item(NAME(m_tape_fast));
- save_item(NAME(m_image_dirty));
- save_item(NAME(m_tape_wr));
- save_item(NAME(m_rw_pos));
- save_item(NAME(m_next_word));
- save_item(NAME(m_rd_it_valid));
- save_item(NAME(m_gap_detect_start));
-
- m_tape_timer = timer_alloc(TAPE_TMR_ID);
- m_hole_timer = timer_alloc(HOLE_TMR_ID);
-}
-
-// device_stop
-void hp_taco_device::device_stop()
-{
-}
-
-// device_reset
-void hp_taco_device::device_reset()
-{
- LOG(("device_reset"));
- clear_state();
-
- m_irq = false;
- m_flg = true;
-
- m_irq_handler(false);
- m_flg_handler(true);
- set_error(false);
-}
-
-void hp_taco_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
-{
- if (CMD_CODE(m_cmd_reg) != CMD_STOP) {
- update_tape_pos();
- }
-
- switch (id) {
- case TAPE_TMR_ID:
- LOG_0(("Tape tmr @%g\n" , machine().time().as_double()));
-
- tape_pos_t length;
-
- switch (CMD_CODE(m_cmd_reg)) {
- case CMD_INDTA_INGAP:
- if (m_cmd_state == 0) {
- m_cmd_state = 1;
- tape_pos_t target = m_tape_pos;
- if (next_n_gap(target, 1, MIN_IRG_LENGTH)) {
- m_tape_timer->adjust(time_to_target(target));
- }
- return;
- }
- break;
-
- case CMD_RECORD_WRITE:
- if (m_cmd_state == 0) {
- if (m_rd_it->second == PREAMBLE_WORD) {
- LOG_0(("Got preamble\n"));
- m_cmd_state = 1;
- // m_rw_pos already at correct position
- m_tape_timer->adjust(fetch_next_wr_word());
- break;
- } else {
- adv_res_t res = adv_it(m_rd_it);
- if (res != ADV_NO_MORE_DATA) {
- m_tape_timer->adjust(time_to_rd_next_word(m_rw_pos));
- }
- // No IRQ
- return;
- }
- }
- // Intentional fall-through
- case CMD_INIT_WRITE:
- write_word(m_rw_pos , m_next_word , length);
- pos_offset(m_rw_pos , length);
- // Just to be sure..
- m_tape_pos = m_rw_pos;
- m_tape_timer->adjust(fetch_next_wr_word());
- break;
-
- case CMD_STOP:
- move_tape_pos(m_tape_fast ? FAST_BRAKE_DIST : SLOW_BRAKE_DIST);
- stop_tape();
- break;
-
- case CMD_INGAP_MOVE:
- if (m_cmd_state == 0) {
- m_cmd_state = 1;
- m_tape_timer->adjust(time_to_tach_pulses());
- return;
- }
- break;
-
- case CMD_FINAL_GAP:
- case CMD_WRITE_IRG:
- write_gap(m_rw_pos , m_tape_pos);
- m_hole_timer->reset();
- break;
-
- case CMD_SCAN_RECORDS:
- if (m_cmd_state == 0) {
- m_cmd_state = 1;
- tape_pos_t target = m_tape_pos;
- if (next_n_gap(target, 0x10000U - m_tach_reg, MIN_IRG_LENGTH)) {
- LOG_0(("%u gaps @%d\n" , 0x10000U - m_tach_reg, target));
- m_tape_timer->adjust(time_to_target(target));
- }
- return;
- } else {
- m_hole_timer->reset();
- }
- break;
-
- case CMD_MOVE_INDTA:
- if (m_cmd_state == 0) {
- if (next_data(m_rd_it , m_tape_pos , true)) {
- m_cmd_state = 1;
- m_tape_timer->adjust(time_to_target(farthest_end(m_rd_it)));
- }
- // No IRQ
- return;
- }
- // m_cmd_state == 1 -> IRQ & cmd end
- break;
-
- case CMD_DELTA_MOVE_HOLE:
- case CMD_DELTA_MOVE_IRG:
- // Interrupt at end of movement
- m_hole_timer->reset();
- break;
-
- case CMD_START_READ:
- {
- bool set_intr = true;
- // Just to be sure..
- m_tape_pos = m_rw_pos;
- if (m_cmd_state == 0) {
- set_intr = false;
- if (m_rd_it->second == PREAMBLE_WORD) {
- m_cmd_state = 1;
- }
- LOG_0(("Got preamble\n"));
- } else {
- m_data_reg = m_rd_it->second;
- m_checksum_reg += m_data_reg;
- LOG_0(("RD %04x\n" , m_data_reg));
- }
- adv_res_t res = adv_it(m_rd_it);
- LOG_0(("adv_it %d\n" , res));
- if (res == ADV_NO_MORE_DATA) {
- m_rd_it_valid = false;
- } else {
- if (res == ADV_DISCONT_DATA) {
- // Hit a gap, restart preamble search
- m_cmd_state = 0;
- }
- m_tape_timer->adjust(time_to_rd_next_word(m_rw_pos));
- }
- if (!set_intr) {
- return;
- }
- }
- break;
-
- case CMD_END_READ:
- {
- m_tape_pos = m_rw_pos;
- // Note: checksum is not updated
- m_data_reg = m_rd_it->second;
- LOG_0(("Final RD %04x\n" , m_data_reg));
- adv_res_t res = adv_it(m_rd_it);
- if (res == ADV_NO_MORE_DATA) {
- m_rd_it_valid = false;
- }
- m_hole_timer->reset();
- }
- break;
-
- default:
- // Other commands: just raise irq
- break;
- }
- irq_w(true);
- break;
-
- case HOLE_TMR_ID:
- LOG_0(("Hole tmr @%g\n" , machine().time().as_double()));
-
- BIT_SET(m_status_reg , STATUS_HOLE_BIT);
-
- switch (CMD_CODE(m_cmd_reg)) {
- case CMD_FINAL_GAP:
- case CMD_WRITE_IRG:
- write_gap(m_rw_pos , m_tape_pos);
- m_rw_pos = m_tape_pos;
- break;
-
- case CMD_SCAN_RECORDS:
- case CMD_DELTA_MOVE_HOLE:
- // Cmds 18 & 1c are terminated at first hole
- m_tape_timer->reset();
- irq_w(true);
- // No reloading of hole timer
- return;
-
- case CMD_DELTA_MOVE_IRG:
- // TODO: update r6
- m_hole_timer->adjust(time_to_next_hole());
- // No IRQ at holes
- return;
-
- case CMD_START_READ:
- case CMD_END_READ:
- set_error(true);
- break;
-
- default:
- // Other cmds: default processing (update tape pos, set IRQ, schedule timer for next hole)
- break;
- }
-
- irq_w(true);
- m_hole_timer->adjust(time_to_next_hole());
- break;
-
- default:
- break;
- }
-}
-
-void hp_taco_device::clear_state(void)
-{
- m_data_reg = 0;
- m_data_reg_full = false;
- m_cmd_reg = 0;
- m_status_reg = 0;
- m_tach_reg = 0;
- m_checksum_reg = 0;
- m_timing_reg = 0;
- m_cmd_state = 0;
- // m_tape_pos is not reset, tape stays where it is
- m_start_time = attotime::never;
- m_tape_fwd = false;
- m_tape_fast = false;
- // m_image_dirty is not touched
- m_tape_wr = false;
- m_rw_pos = 0;
- m_next_word = 0;
- m_rd_it_valid = false;
- m_gap_detect_start = NULL_TAPE_POS;
-
- set_tape_present(false);
- set_tape_present(is_loaded());
-}
-
-void hp_taco_device::irq_w(bool state)
-{
- if (state != m_irq) {
- m_irq = state;
- m_irq_handler(state);
- LOG_0(("IRQ = %d\n" , state));
- }
-}
-
-void hp_taco_device::set_error(bool state)
-{
- m_sts = !state;
- m_sts_handler(m_sts);
- LOG_0(("error = %d\n" , state));
-}
-
-unsigned hp_taco_device::speed_to_tick_freq(void) const
-{
- return m_tape_fast ? TACH_FREQ_FAST * TAPE_POS_FRACT : TACH_FREQ_SLOW * TAPE_POS_FRACT;
-}
-
-bool hp_taco_device::pos_offset(tape_pos_t& pos , tape_pos_t offset) const
-{
- if (offset == 0) {
- return true;
- }
-
- if (!m_tape_fwd) {
- offset = -offset;
- }
-
- pos += offset;
-
- // In real life tape would unspool..
- if (pos > TAPE_LENGTH) {
- pos = TAPE_LENGTH;
- return false;
- } else if (pos < 0) {
- pos = 0;
- return false;
- } else {
- return true;
- }
-}
-
-void hp_taco_device::move_tape_pos(tape_pos_t delta_pos)
-{
- tape_pos_t tape_start_pos = m_tape_pos;
- if (!pos_offset(m_tape_pos , delta_pos)) {
- LOG(("Tape unspooled!\n"));
- }
- m_start_time = machine().time();
- LOG_0(("Tape pos = %u\n" , m_tape_pos));
- if (any_hole(tape_start_pos , m_tape_pos)) {
- // Crossed one or more holes
- BIT_SET(m_status_reg , STATUS_HOLE_BIT);
- }
-}
-
-void hp_taco_device::update_tape_pos(void)
-{
- if (m_start_time.is_never()) {
- // Tape not moving
- return;
- }
-
- attotime delta_time(machine().time() - m_start_time);
- LOG_0(("delta_time = %g\n" , delta_time.as_double()));
- // How many tachometer ticks has the tape moved?
- tape_pos_t delta_tach = (tape_pos_t)(delta_time.as_ticks(speed_to_tick_freq()));
- LOG_0(("delta_tach = %u\n" , delta_tach));
-
- move_tape_pos(delta_tach);
-
- // Gap detection
- bool gap_detected = false;
- if (m_gap_detect_start != NULL_TAPE_POS && abs(m_gap_detect_start - m_tape_pos) >= MIN_IRG_LENGTH) {
- tape_pos_t tmp = m_tape_pos;
- pos_offset(tmp , -MIN_IRG_LENGTH);
- gap_detected = just_gap(tmp , m_tape_pos);
- }
- if (gap_detected) {
- BIT_SET(m_status_reg, STATUS_GAP_BIT);
- } else {
- BIT_CLR(m_status_reg, STATUS_GAP_BIT);
- }
-}
-
-void hp_taco_device::ensure_a_lt_b(tape_pos_t& a , tape_pos_t& b)
-{
- if (a > b) {
- // Ensure A always comes before B
- tape_pos_t tmp;
- tmp = a;
- a = b;
- b = tmp;
- }
-}
-
-// Is there any hole in a given section of tape?
-bool hp_taco_device::any_hole(tape_pos_t tape_pos_a , tape_pos_t tape_pos_b)
-{
- ensure_a_lt_b(tape_pos_a , tape_pos_b);
-
- for (tape_pos_t hole : tape_holes) {
- if (tape_pos_a < hole && tape_pos_b >= hole) {
- return true;
- }
- }
-
- return false;
-}
-
-// Position of next hole tape will reach in a given direction
-hp_taco_device::tape_pos_t hp_taco_device::next_hole(void) const
-{
- if (m_tape_fwd) {
- for (tape_pos_t hole : tape_holes) {
- if (hole > m_tape_pos) {
- LOG_0(("next hole fwd @%u = %u\n" , m_tape_pos , hole));
- return hole;
- }
- }
- // No more holes: will hit end of tape
- return TAPE_LENGTH;
- } else {
- for (int i = (sizeof(tape_holes) / sizeof(tape_holes[ 0 ])) - 1; i >= 0; i--) {
- if (tape_holes[ i ] < m_tape_pos) {
- LOG_0(("next hole rev @%u = %u\n" , m_tape_pos , tape_holes[ i ]));
- return tape_holes[ i ];
- }
- }
- // No more holes: will hit start of tape
- return 0;
- }
-}
-
-attotime hp_taco_device::time_to_distance(tape_pos_t distance) const
-{
- // +1 for rounding
- return attotime::from_ticks(distance + 1 , speed_to_tick_freq());
-}
-
-attotime hp_taco_device::time_to_target(tape_pos_t target) const
-{
- return time_to_distance(abs(target - m_tape_pos));
-}
-
-bool hp_taco_device::start_tape_cmd(UINT16 cmd_reg , UINT16 must_be_1 , UINT16 must_be_0)
-{
- m_cmd_reg = cmd_reg;
-
- UINT16 to_be_tested = (m_cmd_reg & CMD_REG_MASK) | (m_status_reg & STATUS_REG_MASK);
- // Bits in STATUS_ERR_MASK must always be 0
- must_be_0 |= STATUS_ERR_MASK;
-
- // It's not an error if the error state is already set (sts false)
- if (((to_be_tested & (must_be_1 | must_be_0)) ^ must_be_1) != 0) {
- set_error(true);
- return false;
- } else {
- bool prev_tape_wr = m_tape_wr;
- bool prev_tape_fwd = m_tape_fwd;
- bool prev_tape_fast = m_tape_fast;
- bool not_moving = m_start_time.is_never();
-
- m_start_time = machine().time();
- m_tape_wr = (must_be_0 & STATUS_WPR_MASK) != 0;
- m_tape_fwd = DIR_FWD(m_cmd_reg);
- m_tape_fast = SPEED_FAST(m_cmd_reg);
- // TODO: remove?
- BIT_CLR(m_status_reg, STATUS_HOLE_BIT);
-
- if (m_tape_wr) {
- // Write command: disable gap detector
- m_gap_detect_start = NULL_TAPE_POS;
- BIT_CLR(m_status_reg, STATUS_GAP_BIT);
- m_image_dirty = true;
- } else if (not_moving || prev_tape_wr != m_tape_wr || prev_tape_fwd != m_tape_fwd || prev_tape_fast != m_tape_fast) {
- // Tape started right now, switched from writing to reading, direction changed or speed changed: (re)start gap detector
- m_gap_detect_start = m_tape_pos;
- BIT_CLR(m_status_reg, STATUS_GAP_BIT);
- }
- return true;
- }
-}
-
-void hp_taco_device::stop_tape(void)
-{
- m_start_time = attotime::never;
- m_gap_detect_start = NULL_TAPE_POS;
-}
-
-hp_taco_device::tape_track_t& hp_taco_device::current_track(void)
-{
- return m_tracks[ BIT(m_status_reg , STATUS_TRACKB_BIT) ];
-}
-
-// Return physical length of a 16-bit word on tape
-hp_taco_device::tape_pos_t hp_taco_device::word_length(tape_word_t w)
-{
- unsigned zeros , ones;
-
- // pop count of w
- ones = (w & 0x5555) + ((w >> 1) & 0x5555);
- ones = (ones & 0x3333) + ((ones >> 2) & 0x3333);
- ones = (ones & 0x0f0f) + ((ones >> 4) & 0x0f0f);
- ones = (ones & 0x00ff) + ((ones >> 8) & 0x00ff);
-
- zeros = 16 - ones;
-
- return zeros * ZERO_BIT_LEN + (ones + 1) * ONE_BIT_LEN;
-}
-
-hp_taco_device::tape_pos_t hp_taco_device::word_end_pos(const tape_track_t::iterator& it)
-{
- return it->first + word_length(it->second);
-}
-
-void hp_taco_device::adjust_it(tape_track_t& track , tape_track_t::iterator& it , tape_pos_t pos)
-{
- if (it != track.begin()) {
- it--;
- if (word_end_pos(it) <= pos) {
- it++;
- }
- }
-}
-
-// Write a word on current tape track
-void hp_taco_device::write_word(tape_pos_t start , tape_word_t word , tape_pos_t& length)
-{
- tape_track_t& track = current_track();
- tape_track_t::iterator it_low = track.lower_bound(start);
- adjust_it(track , it_low , start);
- length = word_length(word);
- tape_pos_t end_pos = start + length;
- tape_track_t::iterator it_high = track.lower_bound(end_pos);
-
- track.erase(it_low , it_high);
-
- track.insert(it_high , std::make_pair(start, word));
- LOG_0(("WR %04x @ T%u:%u\n" , word , BIT(m_status_reg , STATUS_TRACKB_BIT) , start));
-}
-
-// Write a gap on current track
-void hp_taco_device::write_gap(tape_pos_t a , tape_pos_t b)
-{
- ensure_a_lt_b(a , b);
- tape_track_t& track = current_track();
- tape_track_t::iterator it_low = track.lower_bound(a);
- adjust_it(track , it_low , a);
- tape_track_t::iterator it_high = track.lower_bound(b);
-
- track.erase(it_low, it_high);
-
- LOG_0(("GAP on T%u:[%u,%u)\n" , BIT(m_status_reg , STATUS_TRACKB_BIT) , a , b));
-}
-
-bool hp_taco_device::just_gap(tape_pos_t a , tape_pos_t b)
-{
- ensure_a_lt_b(a , b);
- tape_track_t& track = current_track();
- tape_track_t::iterator it_low = track.lower_bound(a);
- tape_track_t::iterator it_high = track.lower_bound(b);
-
- adjust_it(track, it_low, a);
-
- return it_low == it_high;
-}
-
-hp_taco_device::tape_pos_t hp_taco_device::farthest_end(const tape_track_t::iterator& it) const
-{
- if (m_tape_fwd) {
- return word_end_pos(it);
- } else {
- return it->first;
- }
-}
-
-bool hp_taco_device::next_data(tape_track_t::iterator& it , tape_pos_t pos , bool inclusive)
-{
- tape_track_t& track = current_track();
- it = track.lower_bound(pos);
- if (m_tape_fwd) {
- if (inclusive) {
- adjust_it(track, it, pos);
- }
- return it != track.end();
- } else {
- // Never more than 2 iterations
- do {
- if (it == track.begin()) {
- it = track.end();
- return false;
- }
- it--;
- } while (!inclusive && word_end_pos(it) > pos);
- return true;
- }
-}
-
-hp_taco_device::adv_res_t hp_taco_device::adv_it(tape_track_t::iterator& it)
-{
- tape_track_t& track = current_track();
- if (m_tape_fwd) {
- tape_pos_t prev_pos = word_end_pos(it);
- it++;
- if (it == track.end()) {
- return ADV_NO_MORE_DATA;
- } else {
- adv_res_t res = prev_pos == it->first ? ADV_CONT_DATA : ADV_DISCONT_DATA;
- return res;
- }
- } else {
- if (it == track.begin()) {
- it = track.end();
- return ADV_NO_MORE_DATA;
- } else {
- tape_pos_t prev_pos = it->first;
- it--;
- return prev_pos == word_end_pos(it) ? ADV_CONT_DATA : ADV_DISCONT_DATA;
- }
- }
-}
-
-attotime hp_taco_device::fetch_next_wr_word(void)
-{
- if (m_data_reg_full) {
- m_next_word = m_data_reg;
- m_data_reg_full = false;
- LOG_0(("next %04x (DR)\n" , m_next_word));
- } else {
- // When data register is empty, write checksum word
- m_next_word = m_checksum_reg;
- LOG_0(("next %04x (CS)\n" , m_next_word));
- }
- // Update checksum with new word
- m_checksum_reg += m_next_word;
-
- return time_to_distance(word_length(m_next_word));
-}
-
-attotime hp_taco_device::time_to_rd_next_word(tape_pos_t& word_rd_pos)
-{
- if (m_rd_it_valid) {
- word_rd_pos = farthest_end(m_rd_it);
- return time_to_target(word_rd_pos);
- } else {
- return attotime::never;
- }
-}
-
-/**
- * Scan for next "n_gaps" gaps
- *
- * @param[in,out] pos Start position on input, start of gap on output
- * @param it Pointer to data word where scan is to start
- * @param n_gaps Number of gaps to scan
- * @param min_gap Minimum gap size
- *
- * @return true if n_gaps gaps are found
- */
-bool hp_taco_device::next_n_gap(tape_pos_t& pos , tape_track_t::iterator it , unsigned n_gaps , tape_pos_t min_gap)
-{
- tape_track_t& track = current_track();
- bool done = false;
- tape_track_t::iterator prev_it;
-
- if (m_tape_fwd) {
- tape_pos_t next_pos;
-
- while (1) {
- if (it == track.end()) {
- next_pos = TAPE_LENGTH;
- done = true;
- } else {
- next_pos = it->first;
- }
- if (((next_pos - pos) >= min_gap && --n_gaps == 0) || done) {
- break;
- }
- adv_res_t adv_res;
- do {
- prev_it = it;
- adv_res = adv_it(it);
- } while (adv_res == ADV_CONT_DATA);
- pos = word_end_pos(prev_it);
- }
- } else {
- tape_pos_t next_pos;
-
- while (1) {
- if (it == track.end()) {
- next_pos = 0;
- done = true;
- } else {
- next_pos = word_end_pos(it);
- }
- if (((pos - next_pos) >= min_gap && --n_gaps == 0) || done) {
- break;
- }
- adv_res_t adv_res;
- do {
- prev_it = it;
- adv_res = adv_it(it);
- } while (adv_res == ADV_CONT_DATA);
- pos = prev_it->first;
- }
- }
-
- // Set "pos" where minimum gap size is met
- pos_offset(pos , min_gap);
-
- return n_gaps == 0;
-}
-
-bool hp_taco_device::next_n_gap(tape_pos_t& pos , unsigned n_gaps , tape_pos_t min_gap)
-{
- tape_track_t::iterator it;
- // First align with next data
- next_data(it, pos, true);
- // Then scan for n_gaps
- return next_n_gap(pos, it, n_gaps, min_gap);
-}
-
-void hp_taco_device::clear_tape(void)
-{
- for (unsigned track_n = 0; track_n < 2; track_n++) {
- m_tracks[ track_n ].clear();
- }
-}
-
-void hp_taco_device::dump_sequence(tape_track_t::const_iterator it_start , unsigned n_words)
-{
- if (n_words) {
- UINT32 tmp32;
- UINT16 tmp16;
-
- tmp32 = n_words;
- fwrite(&tmp32 , sizeof(tmp32));
- tmp32 = it_start->first;
- fwrite(&tmp32 , sizeof(tmp32));
-
- for (unsigned i = 0; i < n_words; i++) {
- tmp16 = it_start->second;
- fwrite(&tmp16 , sizeof(tmp16));
- it_start++;
- }
- }
-}
-
-void hp_taco_device::save_tape(void)
-{
- UINT32 tmp32;
-
- fseek(0, SEEK_SET);
-
- tmp32 = FILE_MAGIC;
- fwrite(&tmp32 , sizeof(tmp32));
-
- for (unsigned track_n = 0; track_n < 2; track_n++) {
- const tape_track_t& track = m_tracks[ track_n ];
- tape_pos_t next_pos = (tape_pos_t)-1;
- unsigned n_words = 0;
- tape_track_t::const_iterator it_start;
- for (tape_track_t::const_iterator it = track.cbegin(); it != track.cend(); it++) {
- if (it->first != next_pos) {
- dump_sequence(it_start , n_words);
- it_start = it;
- n_words = 0;
- }
- next_pos = it->first + word_length(it->second);
- n_words++;
- }
- dump_sequence(it_start , n_words);
- // End of track
- tmp32 = (UINT32)-1;
- fwrite(&tmp32 , sizeof(tmp32));
- }
-}
-
-bool hp_taco_device::load_track(tape_track_t& track)
-{
- UINT32 tmp32;
-
- track.clear();
-
- while (1) {
- if (fread(&tmp32 , sizeof(tmp32)) != sizeof(tmp32)) {
- return false;
- }
-
- if (tmp32 == (UINT32)-1) {
- return true;
- }
-
- unsigned n_words = tmp32;
-
- if (fread(&tmp32 , sizeof(tmp32)) != sizeof(tmp32)) {
- return false;
- }
-
- tape_pos_t pos = (tape_pos_t)tmp32;
-
- for (unsigned i = 0; i < n_words; i++) {
- UINT16 tmp16;
-
- if (fread(&tmp16 , sizeof(tmp16)) != sizeof(tmp16)) {
- return false;
- }
-
- track.insert(std::make_pair(pos , tmp16));
- pos += word_length(tmp16);
- }
- }
-}
-
-bool hp_taco_device::load_tape(void)
-{
- UINT32 magic;
-
- if (fread(&magic , sizeof(magic)) != sizeof(magic) ||
- magic != FILE_MAGIC) {
- return false;
- }
-
- for (unsigned track_n = 0; track_n < 2; track_n++) {
- if (!load_track(m_tracks[ track_n ])) {
- LOG(("load_tape failed"));
- clear_tape();
- return false;
- }
- }
-
- LOG(("load_tape done\n"));
- return true;
-}
-
-void hp_taco_device::set_tape_present(bool present)
-{
- if (present) {
- if (is_readonly()) {
- BIT_SET(m_status_reg, STATUS_WPR_BIT);
- } else {
- BIT_CLR(m_status_reg, STATUS_WPR_BIT);
- }
- // STATUS_CART_OUT_BIT is reset by CMD_CLEAR
- } else {
- BIT_SET(m_status_reg, STATUS_CART_OUT_BIT);
- BIT_SET(m_status_reg, STATUS_WPR_BIT);
- }
-}
-
-attotime hp_taco_device::time_to_next_hole(void) const
-{
- return time_to_target(next_hole());
-}
-
-attotime hp_taco_device::time_to_tach_pulses(void) const
-{
- return time_to_distance((tape_pos_t)(0x10000U - m_tach_reg) * TAPE_POS_FRACT);
-}
-
-void hp_taco_device::start_cmd_exec(UINT16 new_cmd_reg)
-{
- LOG(("Cmd = %02x\n" , CMD_CODE(new_cmd_reg)));
-
- update_tape_pos();
-
- attotime cmd_duration = attotime::never;
- attotime time_to_hole = attotime::never;
-
- unsigned new_cmd_code = CMD_CODE(new_cmd_reg);
-
- if (new_cmd_code != CMD_START_READ &&
- new_cmd_code != CMD_END_READ &&
- new_cmd_code != CMD_CLEAR) {
- m_rd_it_valid = false;
- }
-
- switch (new_cmd_code) {
- case CMD_INDTA_INGAP:
- // Errors: CART OUT,FAST SPEED
- if (start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- m_cmd_state = 0;
- if (next_data(m_rd_it , m_tape_pos , true)) {
- cmd_duration = time_to_target(farthest_end(m_rd_it));
- }
- }
- break;
-
- case CMD_FINAL_GAP:
- // Errors: WP,CART OUT
- if (start_tape_cmd(new_cmd_reg , 0 , STATUS_WPR_MASK)) {
- m_rw_pos = m_tape_pos;
- cmd_duration = time_to_distance(END_GAP_LENGTH);
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_CLEAR:
- set_error(false);
- BIT_CLR(m_status_reg, STATUS_HOLE_BIT);
- BIT_CLR(m_status_reg, STATUS_CART_OUT_BIT);
- BIT_CLR(m_status_reg, STATUS_WPR_BIT);
- set_tape_present(is_loaded());
- // This is a special command: it doesn't raise IRQ at completion and it
- // doesn't replace current command
- return;
-
- case CMD_NOT_INDTA:
- // Errors: CART OUT,FAST SPEED
- if (start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- tape_pos_t target = m_tape_pos;
- if (next_n_gap(target, 1, NO_DATA_GAP)) {
- LOG_0(("End of data @%d\n" , target));
- cmd_duration = time_to_target(target);
- }
- // Holes detected?
- }
- break;
-
- case CMD_INIT_WRITE:
- // Errors: WP,CART OUT,fast speed,reverse
- if (start_tape_cmd(new_cmd_reg , DIR_FWD_MASK , STATUS_WPR_MASK | SPEED_FAST_MASK)) {
- m_next_word = PREAMBLE_WORD;
- m_rw_pos = m_tape_pos;
- cmd_duration = time_to_distance(word_length(m_next_word));
- }
- break;
-
- case CMD_STOP:
- if (CMD_CODE(m_cmd_reg) != CMD_STOP) {
- if (m_start_time.is_never()) {
- // Tape is already stopped
- cmd_duration = attotime::from_usec(QUICK_CMD_USEC);
- } else {
- // Start braking timer
- cmd_duration = attotime::from_msec(m_tape_fast ? FAST_BRAKE_MSEC : SLOW_BRAKE_MSEC);
- }
- m_cmd_reg = new_cmd_reg;
- } else {
- // TODO: check if ok
- return;
- }
- break;
-
- case CMD_SET_TRACK:
- // Don't know if this command really starts the tape or not (probably it doesn't)
- if (start_tape_cmd(new_cmd_reg , 0 , 0)) {
- // When b9 is 0, set track A/B
- // When b9 is 1, ignore command (in TACO chip it has an unknown purpose)
- if (!UNKNOWN_B9(new_cmd_reg)) {
- if (CMD_OPT(new_cmd_reg)) {
- BIT_SET(m_status_reg, STATUS_TRACKB_BIT);
- } else {
- BIT_CLR(m_status_reg, STATUS_TRACKB_BIT);
- }
- }
- cmd_duration = attotime::from_usec(QUICK_CMD_USEC);
- }
- break;
-
- case CMD_MOVE:
- if (start_tape_cmd(new_cmd_reg , 0 , 0)) {
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_INGAP_MOVE:
- // Errors: CART OUT,FAST SPEED
- if (start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- m_cmd_state = 0;
- tape_pos_t target = m_tape_pos;
- if (next_n_gap(target, 1, MIN_IRG_LENGTH)) {
- LOG_0(("IRG @%d\n" , target));
- cmd_duration = time_to_target(target);
- }
- // Holes detected?
- }
- break;
-
- case CMD_WRITE_IRG:
- // Errors: WP,CART OUT
- if (start_tape_cmd(new_cmd_reg , 0 , STATUS_WPR_MASK)) {
- m_rw_pos = m_tape_pos;
- cmd_duration = time_to_tach_pulses();
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_SCAN_RECORDS:
- // Errors: CART OUT
- if (start_tape_cmd(new_cmd_reg , 0 , 0)) {
- m_cmd_state = 0;
- if (next_data(m_rd_it , m_tape_pos , true)) {
- cmd_duration = time_to_target(farthest_end(m_rd_it));
- }
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_RECORD_WRITE:
- // Errors: WP,CART OUT,fast speed,reverse
- if (start_tape_cmd(new_cmd_reg , DIR_FWD_MASK , STATUS_WPR_MASK | SPEED_FAST_MASK)) {
- // Search for preamble first
- m_cmd_state = 0;
- m_rd_it_valid = next_data(m_rd_it , m_tape_pos , false);
- cmd_duration = time_to_rd_next_word(m_rw_pos);
- // Holes detected?
- }
- break;
-
- case CMD_MOVE_INDTA:
- // Errors: CART OUT,FAST SPEED
- if (start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- m_cmd_state = 0;
- cmd_duration = time_to_tach_pulses();
- // Holes detected?
- }
- break;
-
- case CMD_UNK_1b:
- if (start_tape_cmd(new_cmd_reg , 0 , 0)) {
- // Unknown purpose, but make it a NOP (it's used in "T" test of test ROM)
- cmd_duration = attotime::from_usec(QUICK_CMD_USEC);
- }
- break;
-
- case CMD_DELTA_MOVE_HOLE:
- case CMD_DELTA_MOVE_IRG:
- if (start_tape_cmd(new_cmd_reg , 0 , 0)) {
- cmd_duration = time_to_tach_pulses();
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_START_READ:
- // Yes, you can read tape backwards: test "C" does that!
- // Because of this DIR_FWD_MASK is not in the "must be 1" mask.
- if (start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- // TODO: check anche m_rw_pos sforato
- if (!m_rd_it_valid) {
- // Search for preamble first
- m_cmd_state = 0;
- m_rd_it_valid = next_data(m_rd_it , m_tape_pos , false);
- }
-
- cmd_duration = time_to_rd_next_word(m_rw_pos);
- time_to_hole = time_to_next_hole();
- }
- break;
-
- case CMD_END_READ:
- // This command only makes sense after CMD_START_READ
- if (CMD_CODE(m_cmd_reg) == CMD_START_READ && m_cmd_state == 1 &&
- start_tape_cmd(new_cmd_reg , 0 , SPEED_FAST_MASK)) {
- LOG_0(("END_READ %d\n" , m_rd_it_valid));
- cmd_duration = time_to_rd_next_word(m_rw_pos);
- time_to_hole = time_to_next_hole();
- }
- break;
-
- default:
- LOG(("Unrecognized command\n"));
- break;
- }
-
- m_tape_timer->adjust(cmd_duration);
- m_hole_timer->adjust(time_to_hole);
-}
-
-bool hp_taco_device::call_load()
-{
- LOG(("call_load %d\n" , has_been_created()));
- if (has_been_created()) {
- clear_tape();
- save_tape();
- } else if (!load_tape()) {
- seterror(IMAGE_ERROR_INVALIDIMAGE , "Wrong format");
- set_tape_present(false);
- return IMAGE_INIT_FAIL;
- }
-
- m_image_dirty = false;
-
- set_tape_present(true);
- return IMAGE_INIT_PASS;
-}
-
-bool hp_taco_device::call_create(int format_type, option_resolution *format_options)
-{
- LOG(("call_create %d\n" , has_been_created()));
- return call_load();
-}
-
-void hp_taco_device::call_unload()
-{
- LOG(("call_unload dirty=%d\n" , m_image_dirty));
- if (m_image_dirty) {
- save_tape();
- m_image_dirty = false;
- }
-
- clear_tape();
- set_tape_present(false);
-}
-
-const char *hp_taco_device::file_extensions() const
-{
- return "hti";
-}