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author Robbbert <robbbert@users.noreply.github.com>2014-03-04 11:57:46 +0000
committer Robbbert <robbbert@users.noreply.github.com>2014-03-04 11:57:46 +0000
commit174b7aa57eb9852a162440aa01a545ac613e6fcc (patch)
tree0184016909b9b66df69b1ac1c125f58f60bf3d5b /src
parentb50d6fff9ddece0e8d11162799d5db9e5421e759 (diff)
(MESS) SOL20 : added partial support for SVT format (used in Solace emulator) [Robbbert]
Diffstat (limited to 'src')
-rw-r--r--src/lib/formats/sol_cas.c377
-rw-r--r--src/lib/formats/sol_cas.h15
-rw-r--r--src/lib/lib.mak1
-rw-r--r--src/mess/drivers/ptcsol.c75
4 files changed, 428 insertions, 40 deletions
diff --git a/src/lib/formats/sol_cas.c b/src/lib/formats/sol_cas.c
new file mode 100644
index 00000000000..67c7c4ba4dc
--- /dev/null
+++ b/src/lib/formats/sol_cas.c
@@ -0,0 +1,377 @@
+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/********************************************************************
+
+Support for SOL-20 cassette images
+
+
+SOL20 tapes consist of these sections:
+1. A high tone whenever idle
+2. A header
+3. The data, in blocks of 256 bytes plus a CRC byte
+4. The last block may be shorter, depending on the number of bytes
+ left to save.
+
+Each byte has 1 start bit, 8 data bits (0-7), 2 stop bits.
+
+The default speed is 1200 baud, which is what we emulate here.
+A high bit is 1 cycle of 1200 Hz, while a low bit is half a cycle
+of 600 Hz.
+
+Formats:
+SVT - The full explanation may be found on the Solace web site,
+ however this is a summary of what we support.
+ C (carrier) time in decaseconds
+ D (data bytes) in ascii text
+ H (header) tape header info
+ Multiple programs
+ Unsupported:
+ B (set baud rate) B 300 or B 1200
+ F load ENT file
+ S (silence) time in decaseconds
+ bad-byte symbols
+ escaped characters
+
+********************************************************************/
+
+#include "sol_cas.h"
+
+#define WAVEENTRY_LOW -32768
+#define WAVEENTRY_HIGH 32767
+
+#define SOL20_WAV_FREQUENCY 4800
+
+// image size
+static UINT32 sol20_image_size;
+static bool level;
+static UINT8 sol20_cksm_byte;
+static UINT32 sol20_byte_num;
+static UINT8 sol20_header[16];
+
+static int sol20_put_samples(INT16 *buffer, int sample_pos, int count)
+{
+ if (buffer)
+ {
+ for (int i=0; i<count; i++)
+ buffer[sample_pos + i] = level ? WAVEENTRY_LOW : WAVEENTRY_HIGH;
+
+ level ^= 1;
+ }
+
+ return count;
+}
+
+static int sol20_output_bit(INT16 *buffer, int sample_pos, bool bit)
+{
+ int samples = 0;
+
+ if (bit)
+ {
+ samples += sol20_put_samples(buffer, sample_pos + samples, 2);
+ samples += sol20_put_samples(buffer, sample_pos + samples, 2);
+ }
+ else
+ {
+ samples += sol20_put_samples(buffer, sample_pos + samples, 4);
+ }
+
+ return samples;
+}
+
+static int sol20_output_byte(INT16 *buffer, int sample_pos, UINT8 byte)
+{
+ int samples = 0;
+ UINT8 i;
+
+ /* start */
+ samples += sol20_output_bit (buffer, sample_pos + samples, 0);
+
+ /* data */
+ for (i = 0; i<8; i++)
+ samples += sol20_output_bit (buffer, sample_pos + samples, (byte >> i) & 1);
+
+ /* stop */
+ for (i = 0; i<2; i++)
+ samples += sol20_output_bit (buffer, sample_pos + samples, 1);
+
+ return samples;
+}
+
+// Calculate checksum
+static UINT8 sol20_calc_cksm(UINT8 cksm, UINT8 data)
+{
+ data -= cksm;
+ cksm = data;
+ data ^= cksm;
+ data ^= 0xff;
+ data -= cksm;
+ return data;
+}
+
+// Ignore remainder of line
+static void sol20_scan_to_eol(const UINT8 *bytes)
+{
+ bool t = 1;
+ while (t)
+ {
+ if (sol20_byte_num >= sol20_image_size)
+ {
+ sol20_byte_num = 0;
+ t = 0;
+ }
+ else
+ if (bytes[sol20_byte_num] == 0x0d)
+ t = 0;
+ else
+ sol20_byte_num++;
+ }
+}
+
+// skip spaces and symbols looking for a hex digit
+static void sol20_scan_to_hex(const UINT8 *bytes)
+{
+ bool t = 1;
+ while (t)
+ {
+ if (sol20_byte_num >= sol20_image_size)
+ {
+ sol20_byte_num = 0;
+ t = 0;
+ }
+ else
+ {
+ UINT8 chr = bytes[sol20_byte_num];
+ if (chr == 0x0d)
+ t = 0;
+ else
+ if (((chr >= '0') && (chr <= '9')) || ((chr >= 'A') && (chr <= 'F')))
+ t = 0;
+ else
+ sol20_byte_num++;
+ }
+ }
+}
+
+// Turn n digits into hex
+static int sol20_read_hex(const UINT8 *bytes, UINT8 numdigits)
+{
+ int data = 0;
+ UINT8 i,chr;
+
+ for (i = 0; i < numdigits; i++)
+ {
+ chr = bytes[sol20_byte_num];
+ if ((chr >= '0') && (chr <= '9'))
+ {
+ data = (data << 4) | (chr-48);
+ sol20_byte_num++;
+ }
+ else
+ if ((chr >= 'A') && (chr <= 'F'))
+ {
+ data = (data << 4) | (chr-55);
+ sol20_byte_num++;
+ }
+ else
+ i = numdigits;
+ }
+ return data;
+}
+
+// Turn digits into decimal
+static int sol20_read_dec(const UINT8 *bytes)
+{
+ int data = 0;
+
+ while ((bytes[sol20_byte_num] >= '0') && (bytes[sol20_byte_num] <= '9'))
+ {
+ data = data*10 + bytes[sol20_byte_num] - 48;
+ sol20_byte_num++;
+ }
+
+ return data;
+}
+
+static int sol20_handle_cassette(INT16 *buffer, const UINT8 *bytes)
+{
+ UINT32 sample_count = 0;
+ UINT32 i = 0,t = 0;
+ UINT8 c = 0;
+ sol20_byte_num = 1;
+ bool process_d = 0;
+ UINT16 length = 0;
+
+ // 1st line of file must say SVT
+ if ((bytes[0] == 'S') && (bytes[1] == 'V') && (bytes[2] == 'T'))
+ { }
+ else
+ return sample_count;
+
+ // ignore remainder of line
+ sol20_scan_to_eol(bytes);
+
+ // process the commands
+ while (sol20_byte_num)
+ {
+ sol20_byte_num+=2; // bump to start of next line
+ UINT8 chr = bytes[sol20_byte_num]; // Get command
+ if (sol20_byte_num >= sol20_image_size)
+ sol20_byte_num = 0;
+ else
+ {
+ switch (chr)
+ {
+ case 0x0d:
+ break;
+ case 'C': // carrier
+ {
+ if (c) // if this is the next file, clean up after the previous one
+ {
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_cksm_byte); // final checksum if needed
+ c = 0;
+ }
+
+ sol20_byte_num+=2; // bump to parameter
+ t = sol20_read_dec(bytes) * 140; // convert 10th of seconds to number of ones
+ for (i = 0; i < t; i++)
+ sample_count += sol20_output_bit(buffer, sample_count, 1);
+ sol20_scan_to_eol(bytes);
+ break;
+ }
+ case 'H': // header
+ {
+ if (c) // if this is the next file, clean up after the previous one
+ {
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_cksm_byte); // final checksum if needed
+ c = 0;
+ }
+
+ sol20_byte_num+=2; // bump to file name
+ sol20_header[0] = bytes[sol20_byte_num++];
+ sol20_header[1] = bytes[sol20_byte_num++];
+ sol20_header[2] = bytes[sol20_byte_num++];
+ sol20_header[3] = bytes[sol20_byte_num++];
+ sol20_header[4] = bytes[sol20_byte_num++];
+ sol20_header[5] = 0;
+ sol20_scan_to_hex(bytes); // bump to file type
+ sol20_header[6] = sol20_read_hex(bytes, 2);
+ sol20_scan_to_hex(bytes); // bump to length
+ length = sol20_read_hex(bytes, 4);
+ sol20_header[7] = length;
+ sol20_header[8] = length >> 8;
+ sol20_scan_to_hex(bytes); // bump to load-address
+ i = sol20_read_hex(bytes, 4);
+ sol20_header[9] = i;
+ sol20_header[10] = i >> 8;
+ sol20_scan_to_hex(bytes); // bump to exec-address
+ i = sol20_read_hex(bytes, 4);
+ sol20_header[11] = i;
+ sol20_header[12] = i >> 8;
+ sol20_header[13] = 0;
+ sol20_header[14] = 0;
+ sol20_header[15] = 0;
+ sol20_cksm_byte = 0;
+ for (i = 0; i < 16; i++)
+ sol20_cksm_byte = sol20_calc_cksm(sol20_cksm_byte, sol20_header[i]);
+ // write leader
+ for (i = 0; i < 100; i++)
+ sample_count += sol20_output_byte(buffer, sample_count, 0);
+ // write SOH
+ sample_count += sol20_output_byte(buffer, sample_count, 1);
+ // write Header
+ for (i = 0; i < 16; i++)
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_header[i]);
+ // write checksum
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_cksm_byte);
+
+ sol20_cksm_byte = 0;
+ process_d = 1;
+ sol20_scan_to_eol(bytes);
+ break;
+ }
+ case 'D': // data
+ {
+ sol20_byte_num+=2; // bump to first byte
+ while ((bytes[sol20_byte_num] != 0x0d) && sol20_byte_num && process_d)
+ {
+ t = sol20_read_hex(bytes, 2);
+ sample_count += sol20_output_byte(buffer, sample_count, t);
+ sol20_cksm_byte = sol20_calc_cksm(sol20_cksm_byte, t);
+ c++;
+ length--;
+ if (!length)
+ process_d = 0;
+ if (!c)
+ {
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_cksm_byte);
+ sol20_cksm_byte = 0;
+ }
+ sol20_scan_to_hex(bytes);
+ }
+ }
+ default: // everything else is ignored
+ sol20_scan_to_eol(bytes);
+ break;
+ }
+ }
+ }
+
+ if (c) // reached the end of the svt file
+ sample_count += sol20_output_byte(buffer, sample_count, sol20_cksm_byte); // final checksum if needed
+
+ return sample_count;
+}
+
+
+/*******************************************************************
+ Generate samples for the tape image
+********************************************************************/
+
+static int sol20_cassette_fill_wave(INT16 *buffer, int length, UINT8 *bytes)
+{
+ return sol20_handle_cassette(buffer, bytes);
+}
+
+/*******************************************************************
+ Calculate the number of samples needed for this tape image
+********************************************************************/
+
+static int sol20_cassette_calculate_size_in_samples(const UINT8 *bytes, int length)
+{
+ sol20_image_size = length;
+
+ return sol20_handle_cassette(NULL, bytes);
+}
+
+static const struct CassetteLegacyWaveFiller sol20_legacy_fill_wave =
+{
+ sol20_cassette_fill_wave, /* fill_wave */
+ -1, /* chunk_size */
+ 0, /* chunk_samples */
+ sol20_cassette_calculate_size_in_samples, /* chunk_sample_calc */
+ SOL20_WAV_FREQUENCY, /* sample_frequency */
+ 0, /* header_samples */
+ 0 /* trailer_samples */
+};
+
+static casserr_t sol20_cassette_identify(cassette_image *cassette, struct CassetteOptions *opts)
+{
+ return cassette_legacy_identify(cassette, opts, &sol20_legacy_fill_wave);
+}
+
+static casserr_t sol20_cassette_load(cassette_image *cassette)
+{
+ return cassette_legacy_construct(cassette, &sol20_legacy_fill_wave);
+}
+
+static const struct CassetteFormat sol20_cassette_image_format =
+{
+ "svt",
+ sol20_cassette_identify,
+ sol20_cassette_load,
+ NULL
+};
+
+CASSETTE_FORMATLIST_START(sol20_cassette_formats)
+ CASSETTE_FORMAT(sol20_cassette_image_format)
+CASSETTE_FORMATLIST_END
diff --git a/src/lib/formats/sol_cas.h b/src/lib/formats/sol_cas.h
new file mode 100644
index 00000000000..60388e012ab
--- /dev/null
+++ b/src/lib/formats/sol_cas.h
@@ -0,0 +1,15 @@
+// license:BSD-3-Clause
+// copyright-holders:Robbbert
+/*********************************************************************
+
+ sol_cas.h
+
+ Format code for SOL-20 cassette images
+
+*********************************************************************/
+
+
+#include "cassimg.h"
+
+CASSETTE_FORMATLIST_EXTERN(sol20_cassette_formats);
+
diff --git a/src/lib/lib.mak b/src/lib/lib.mak
index a53e9b002c8..f462fdbdd8f 100644
--- a/src/lib/lib.mak
+++ b/src/lib/lib.mak
@@ -181,6 +181,7 @@ FORMATSOBJS = \
$(LIBOBJ)/formats/sc3000_bit.o \
$(LIBOBJ)/formats/sf7000_dsk.o \
$(LIBOBJ)/formats/smx_dsk.o \
+ $(LIBOBJ)/formats/sol_cas.o \
$(LIBOBJ)/formats/sorc_dsk.o \
$(LIBOBJ)/formats/sorc_cas.o \
$(LIBOBJ)/formats/sord_cas.o \
diff --git a/src/mess/drivers/ptcsol.c b/src/mess/drivers/ptcsol.c
index d9b5f7588e1..921ff7b6ee2 100644
--- a/src/mess/drivers/ptcsol.c
+++ b/src/mess/drivers/ptcsol.c
@@ -71,9 +71,8 @@
correct version of BASIC be loaded first. Paste works, but it is very
very slow. Perhaps we need something faster such as what Solace has.
- SVT (Solace Virtual Tape) files are a representation of a cassette,
- usually holding about 4 games, just like a multifile tape. It will
- need a 'format' program to be written to convert it to be loadable
- via the cassette device.
+ usually holding about 4 games, just like a multifile tape. This format
+ is partially supported.
- HEX files appear to be the standard Intel format, and can be loaded
by Solace.
- The remaining formats (OPN, PL, PRN, SMU, SOL, ASM and LIB) appear
@@ -107,6 +106,7 @@
#include "sound/wave.h"
#include "imagedev/cassette.h"
#include "machine/ay31015.h"
+#include "formats/sol_cas.h"
struct cass_data_t {
@@ -134,23 +134,22 @@ public:
};
sol20_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag),
- m_maincpu(*this, "maincpu"),
- m_cass1(*this, "cassette"),
- m_cass2(*this, "cassette2"),
- m_uart(*this, "uart"),
- m_uart_s(*this, "uart_s"),
- m_p_videoram(*this, "videoram"),
- m_iop_arrows(*this, "ARROWS"),
- m_iop_config(*this, "CONFIG"),
- m_iop_s1(*this, "S1"),
- m_iop_s2(*this, "S2"),
- m_iop_s3(*this, "S3"),
- m_iop_s4(*this, "S4"),
- m_cassette1(*this, "cassette"),
- m_cassette2(*this, "cassette2")
- {
- }
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_cass1(*this, "cassette")
+ , m_cass2(*this, "cassette2")
+ , m_uart(*this, "uart")
+ , m_uart_s(*this, "uart_s")
+ , m_p_videoram(*this, "videoram")
+ , m_iop_arrows(*this, "ARROWS")
+ , m_iop_config(*this, "CONFIG")
+ , m_iop_s1(*this, "S1")
+ , m_iop_s2(*this, "S2")
+ , m_iop_s3(*this, "S3")
+ , m_iop_s4(*this, "S4")
+ , m_cassette1(*this, "cassette")
+ , m_cassette2(*this, "cassette2")
+ { }
DECLARE_READ8_MEMBER( sol20_f8_r );
DECLARE_READ8_MEMBER( sol20_f9_r );
@@ -165,12 +164,24 @@ public:
DECLARE_WRITE8_MEMBER( sol20_fd_w );
DECLARE_WRITE8_MEMBER( sol20_fe_w );
DECLARE_WRITE8_MEMBER( kbd_put );
+ DECLARE_DRIVER_INIT(sol20);
+ TIMER_CALLBACK_MEMBER(sol20_cassette_tc);
+ TIMER_CALLBACK_MEMBER(sol20_boot);
+ UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+private:
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
UINT8 m_sol20_fa;
- cass_data_t m_cass_data;
virtual void machine_reset();
virtual void machine_start();
virtual void video_start();
- UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+ UINT8 m_sol20_fc;
+ UINT8 m_sol20_fe;
+ const UINT8 *m_p_chargen;
+ UINT8 m_framecnt;
+ cass_data_t m_cass_data;
+ emu_timer *m_cassette_timer;
+ cassette_image_device *cassette_device_image();
required_device<cpu_device> m_maincpu;
required_device<cassette_image_device> m_cass1;
required_device<cassette_image_device> m_cass2;
@@ -183,24 +194,8 @@ public:
required_ioport m_iop_s2;
required_ioport m_iop_s3;
required_ioport m_iop_s4;
-
-private:
- UINT8 m_sol20_fc;
- UINT8 m_sol20_fe;
- const UINT8 *m_p_chargen;
- UINT8 m_framecnt;
- emu_timer *m_cassette_timer;
required_device<cassette_image_device> m_cassette1;
required_device<cassette_image_device> m_cassette2;
-
-public:
- DECLARE_DRIVER_INIT(sol20);
- TIMER_CALLBACK_MEMBER(sol20_cassette_tc);
- TIMER_CALLBACK_MEMBER(sol20_boot);
- cassette_image_device *cassette_device_image();
-
-protected:
- virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
};
@@ -564,9 +559,9 @@ static const ay31015_config sol20_ay31015_config =
static const cassette_interface sol20_cassette_interface =
{
- cassette_default_formats,
+ sol20_cassette_formats,//cassette_default_formats,
NULL,
- (cassette_state)(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED),
+ (cassette_state)(CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED),
NULL,
NULL
};