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+/*
+ MESS Driver for the Myarc Geneve 9640.
+
+ The Geneve has two operation modes. One is compatible with the TI-99/4a,
+ the other is not.
+
+
+ General architecture:
+
+ TMS9995@12MHz (including 256 bytes of on-chip 16-bit RAM and a timer),
+ V9938, SN76496 (compatible with TMS9919), TMS9901, MM58274 RTC, 512 kbytes
+ of 1-wait-state CPU RAM (expandable to almost 2 Mbytes), 32 kbytes of
+ 0-wait-state CPU RAM (expandable to 64 kbytes), 128 kbytes of VRAM
+ (expandable to 192 kbytes).
+
+
+ Memory map:
+
+ 64-kbyte CPU address space is mapped to a 2-Mbyte virtual address space.
+ 8 8-kbyte pages are available simultaneously, out of a total of 256.
+
+ Page map (regular console):
+ >00->3f: 512kbytes of CPU RAM (pages >36 and >37 are used to emulate
+ cartridge CPU ROMs in ti99 mode, and pages >38 through >3f are used to
+ emulate console and cartridge GROMs in ti99 mode)
+ >40->7f: optional Memex RAM (except >7a and >7c that are mirrors of >ba and
+ >bc?)
+ >80->b7: PE-bus space using spare address lines (AMA-AMC)? Used by RAM
+ extension (Memex or PE-Bus 512k card).
+ >b8->bf: PE-bus space (most useful pages are >ba: DSR space and >bc: speech
+ synthesizer page; other pages are used by RAM extension)
+ >c0->e7: optional Memex RAM
+ >e8->ef: 64kbytes of 0-wait-state RAM (with 32kbytes of SRAM installed,
+ only even pages (>e8, >ea, >ec and >ee) are available)
+ >f0->f1: boot ROM
+ >f2->fe: optional Memex RAM? (except >fa and >fc that are mirrors of >ba
+ and >bc?)
+ >ff: always empty?
+
+ Page map (genmod console):
+ >00->39, >40->b9, >bb, >bd->ef, f2->fe: Memex RAM (except >3a, >3c, >7a,
+ >7c, >fa and >fc that are mirrors of >ba and >bc?) (I don't know if
+ >e8->ef is on the Memex board or the Geneve motherboard)
+ >ba: DSR space
+ >bc: speech synthesizer space
+ >f0->f1: boot ROM
+ >ff: always empty?
+
+ >00->3f: switch-selectable(?): 512kbytes of onboard RAM (1-wait-state DRAM)
+ or first 512kbytes of the Memex Memory board (0-wait-state SRAM). The
+ latter setting is incompatible with TI mode.
+
+ Note that >bc is actually equivalent to >8000->9fff on the /4a bus,
+ therefore the speech synthesizer is only available at offsets >1800->1bff
+ (read port) and >1c00->1fff (write port). OTOH, if you installed a FORTI
+ sound card, it will be available in the same page at offsets >0400->7ff.
+
+
+ Unpaged locations (ti99 mode):
+ >8000->8007: memory page registers (>8000 for page 0, >8001 for page 1,
+ etc. register >8003 is ignored (this page is hard-wired to >36->37).
+ >8008: key buffer
+ >8009->800f: ???
+ >8010->801f: clock chip
+ >8400->9fff: sound, VDP, speech, and GROM registers (according to one
+ source, the GROM and sound registers are only available if page >3
+ is mapped in at location >c000 (register 6). I am not sure the Speech
+ registers are implemented, though I guess they are.)
+ Note that >8020->83ff is mapped to regular CPU RAM according to map
+ register 4.
+
+ Unpaged locations (native mode):
+ >f100: VDP data port (read/write)
+ >f102: VDP address/status port (read/write)
+ >f104: VDP port 2
+ >f106: VDP port 3
+ >f108->f10f: VDP mirror (used by Barry Boone's converted Tomy cartridges)
+ >f110->f117: memory page registers (>f110 for page 0, >f111 for page 1,
+ etc.)
+ >f118: key buffer
+ >f119->f11f: ???
+ >f120: sound chip
+ >f121->f12f: ???
+ >f130->f13f: clock chip
+
+ Unpaged locations (tms9995 locations):
+ >f000->f0fb and >fffc->ffff: tms9995 RAM
+ >fffa->fffb: tms9995 timer register
+ Note: accessing tms9995 locations will also read/write corresponding paged
+ locations.
+
+
+ GROM emulator:
+
+ The GPL interface is accessible only in TI99 mode. GPL data is fetched
+ from pages >38->3f. It uses a straight 16-bit address pointer. The
+ address pointer is incremented when the read data and write data ports
+ are accessed, and when the second byte of the GPL address is written. A
+ weird consequence of this is the fact that GPL data is always off by one
+ byte, i.e. GPL bytes 0, 1, 2... are stored in bytes 1, 2, 3... of pages
+ >38->3f (byte 0 of page >38 corresponds to GPL address >ffff).
+
+ I think that I have once read that the geneve GROM emulator does not
+ emulate wrap-around within a GROM, i.e. address >1fff is followed by >2000
+ (instead of >0000 with a real GROM).
+
+ There are two ways to implement GPL address load and store.
+ One is maintaining 2 flags (one for address read and one for address write)
+ that tell if you are accessing address LSB: these flags must be cleared
+ whenever data is read, and the read flag must be cleared when the write
+ address port is written to.
+ The other is to shift the register and always read/write the MSByte of the
+ address pointer. The LSByte is copied to the MSbyte when the address is
+ read, whereas the former MSByte is copied to the LSByte when the address is
+ written. The address pointer must be incremented after the address is
+ written to. It will not harm if it is incremented after the address is
+ read, provided the LSByte has been cleared.
+
+
+ Cartridge emulator:
+
+ The cartridge interface is in the >6000->7fff area.
+
+ If CRU bit @>F7C is set, the cartridge area is always mapped to virtual
+ page >36. Writes in the >6000->6fff area are ignored if the CRU bit @>F7D
+ is 0, whereas writes in the >7000->7fff area are ignored if the CRU bit
+ @>F7E is 0.
+
+ If CRU bit @>F7C is clear, the cartridge area is mapped either to virtual
+ page >36 or to page >37 according to which page is currently selected.
+ Writing data to address >6000->7fff will select page >36 if A14 is 0,
+ >37 if A14 is 1.
+
+
+ CRU map:
+
+ Base >0000: tms9901
+ tms9901 pin assignment:
+ int1: external interrupt (INTA on PE-bus) (connected to tms9995 (int4/EC)*
+ pin as well)
+ int2: VDP interrupt
+ int3-int7: joystick port inputs (fire, left, right, down, up)
+ int8: keyboard interrupt (asserted when key buffer full)
+ int9/p13: unused
+ int10/p12: third mouse button
+ int11/p11: clock interrupt?
+ int12/p10: INTB from PE-bus
+ int13/p9: (used as output)
+ int14/p8: unused
+ int15/p7: (used as output)
+ p0: PE-bus reset line
+ p1: VDP reset line
+ p2: joystick select (0 for joystick 1, 1 for joystick 2)
+ p3-p5: unused
+ p6: keyboard reset line
+ p7/int15: external mem cycles 0=long, 1=short
+ p9/int13: vdp wait cycles 1=add 15 cycles, 0=add none
+
+ Base >1EE0 (>0F70): tms9995 flags and geneve mode register
+ bits 0-1: tms9995 flags
+ Bits 2-4: tms9995 interrupt state register
+ Bits 5-15: tms9995 user flags - overlaps geneve mode, but hopefully the
+ geneve registers are write-only, so no real conflict happens
+ TMS9995 user flags:
+ Bit 5: 0 if NTSC, 1 if PAL video
+ Bit 6: unused???
+ Bit 7: some keyboard flag, set to 1 if caps is on
+ Geneve gate array + TMS9995 user flags:
+ Bit 8: 1 = allow keyboard clock
+ Bit 9: 0 = clear keyboard input buffer, 1 = allow keyboard buffer to be
+ loaded
+ Bit 10: 1 = geneve mode, 0 = ti99 mode
+ Bit 11: 1 = ROM mode, 0 = map mode
+ Bit 12: 0 = Enable cartridge paging
+ Bit 13: 0 = protect cartridge range >6000->6fff
+ Bit 14: 0 = protect cartridge range >7000->7fff
+ bit 15: 1 = add 1 extra wait state when accessing 0-wait-state SRAM???
+
+
+ Keyboard interface:
+
+ The XT keyboard interface is described in various places on the internet,
+ like (http://www-2.cs.cmu.edu/afs/cs/usr/jmcm/www/info/key2.txt). It is a
+ synchronous unidirectional serial interface: the data line is driven by the
+ keyboard to send data to the CPU; the CTS/clock line has a pull up resistor
+ and can be driven low by both keyboard and CPU. To send data to the CPU,
+ the keyboard pulses the clock line low 9 times, and the Geneve samples all
+ 8 bits of data (plus one start bit) on each falling edge of the clock.
+ When the key code buffer is full, the Geneve gate array asserts the kbdint*
+ line (connected to 9901 INT8*). The Geneve gate array will hold the
+ CTS/clock line low as long as the keyboard buffer is full or CRU bit @>F78
+ is 0. Writing a 0 to >F79 will clear the Geneve keyboard buffer, and
+ writing a 1 will resume normal operation: you need to write a 0 to >F78
+ before clearing >F79, or the keyboard will be enabled to send data the gate
+ array when >F79 is is set to 0, and any such incoming data from the
+ keyboard will be cleared as soon as it is buffered by the gate array.
+
+ Original version 2003 by Raphael Nabet
+
+ Rewritten 2012 by Michael Zapf
+*/
+
+
+#include "emu.h"
+#include "cpu/tms9900/tms9995.h"
+#include "machine/tms9901.h"
+#include "machine/mm58274c.h"
+#include "sound/sn76496.h"
+
+#include "machine/ti99/genboard.h"
+#include "machine/ti99/peribox.h"
+#include "machine/ti99/videowrp.h"
+
+#include "machine/ti99/joyport.h"
+
+#define VERBOSE 1
+#define LOG logerror
+
+#define SRAM_SIZE 384*1024 // maximum SRAM expansion on-board
+#define DRAM_SIZE 512*1024
+
+class geneve : public driver_device
+{
+public:
+ geneve(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag) { }
+
+ // CRU (Communication Register Unit) handling
+ DECLARE_READ8_MEMBER(cruread);
+ DECLARE_WRITE8_MEMBER(cruwrite);
+
+ // Connections with the system interface TMS9901
+ DECLARE_READ8_MEMBER(read_by_9901);
+ DECLARE_WRITE_LINE_MEMBER(peripheral_bus_reset);
+ DECLARE_WRITE_LINE_MEMBER(VDP_reset);
+ DECLARE_WRITE_LINE_MEMBER(joystick_select);
+ DECLARE_WRITE_LINE_MEMBER(extbus_wait_states);
+ DECLARE_WRITE_LINE_MEMBER(video_wait_states);
+
+ DECLARE_WRITE_LINE_MEMBER(clock_out);
+ DECLARE_WRITE8_MEMBER(external_operation);
+
+ DECLARE_WRITE8_MEMBER(tms9901_interrupt);
+
+ WRITE_LINE_MEMBER( keyboard_interrupt );
+
+ geneve_keyboard_device* m_keyboard;
+ geneve_mouse_device* m_mouse;
+ tms9901_device* m_tms9901;
+ geneve_mapper_device* m_mapper;
+ peribox_device* m_peribox;
+ tms9995_device* m_cpu;
+ joyport_device* m_joyport;
+
+ WRITE_LINE_MEMBER( inta );
+ WRITE_LINE_MEMBER( intb );
+ WRITE_LINE_MEMBER( ext_ready );
+ WRITE_LINE_MEMBER( mapper_ready );
+
+ DECLARE_DRIVER_INIT(geneve);
+
+ void set_tms9901_INT2_from_v9938(v99x8_device &vdp, int state);
+
+ line_state m_inta;
+ line_state m_intb;
+ line_state m_int2;
+ line_state m_keyint;
+ line_state m_video_wait; // reflects the line to the mapper for CRU query
+
+ int m_ready_line, m_ready_line1;
+
+private:
+ int m_joystick_select;
+ // Some values to keep. Rest is on the geneve_mapper.
+};
+
+/*
+ Memory map
+*/
+
+static ADDRESS_MAP_START(memmap, AS_PROGRAM, 8, geneve)
+ AM_RANGE(0x0000, 0xffff) AM_DEVREADWRITE(GMAPPER_TAG, geneve_mapper_device, readm, writem)
+ADDRESS_MAP_END
+
+/*
+ CRU map
+ The TMS9901 is fully decoded, no mirroring, so we have 32 bits for it,
+ and the rest goes to the board (and from there to the PEB)
+ TMS9995 has a full 15-bit CRU bit address space (attached to A0-A14)
+ TODO: Check whether A0-A2 are available for CRU addressing since those
+ bits are usually routed through the mapper first.
+*/
+static ADDRESS_MAP_START(crumap, AS_IO, 8, geneve)
+ AM_RANGE(0x0000, 0x0003) AM_DEVREAD(TMS9901_TAG, tms9901_device, read)
+ AM_RANGE(0x0000, 0x0fff) AM_READ( cruread )
+
+ AM_RANGE(0x0000, 0x001f) AM_DEVWRITE(TMS9901_TAG, tms9901_device, write)
+ AM_RANGE(0x0000, 0x7fff) AM_WRITE( cruwrite )
+ADDRESS_MAP_END
+
+/* TI joysticks. The keyboard is implemented in genboard.c. */
+static INPUT_PORTS_START(geneve)
+
+ PORT_START( "MODE" )
+ PORT_CONFNAME( 0x01, 0x00, "Operating mode" ) PORT_CHANGED_MEMBER(PERIBOX_TAG, peribox_device, genmod_changed, 0)
+ PORT_CONFSETTING( 0x00, "Standard" )
+ PORT_CONFSETTING( GENMOD, "GenMod" )
+
+ PORT_START( "BOOTROM" )
+ PORT_CONFNAME( 0x01, GENEVE_098, "Boot ROM" ) PORT_CONDITION( "MODE", 0x01, EQUALS, 0x00 )
+ PORT_CONFSETTING( GENEVE_098, "Version 0.98" )
+ PORT_CONFSETTING( GENEVE_100, "Version 1.00" )
+
+ PORT_START( "SRAM" )
+ PORT_CONFNAME( 0x03, 0x01, "Onboard SRAM" ) PORT_CONDITION( "MODE", 0x01, EQUALS, 0x00 )
+ PORT_CONFSETTING( 0x00, "32 KiB" )
+ PORT_CONFSETTING( 0x01, "64 KiB" )
+ PORT_CONFSETTING( 0x02, "384 KiB" )
+
+ PORT_START( "GENMODDIPS" )
+ PORT_DIPNAME( GM_TURBO, 0x00, "Genmod Turbo mode") PORT_CONDITION( "MODE", 0x01, EQUALS, GENMOD ) PORT_CHANGED_MEMBER(GMAPPER_TAG, geneve_mapper_device, gm_changed, 1)
+ PORT_CONFSETTING( 0x00, DEF_STR( Off ))
+ PORT_CONFSETTING( GM_TURBO, DEF_STR( On ))
+ PORT_DIPNAME( GM_TIM, GM_TIM, "Genmod TI mode") PORT_CONDITION( "MODE", 0x01, EQUALS, GENMOD ) PORT_CHANGED_MEMBER(GMAPPER_TAG, geneve_mapper_device, gm_changed, 2)
+ PORT_CONFSETTING( 0x00, DEF_STR( Off ))
+ PORT_CONFSETTING( GM_TIM, DEF_STR( On ))
+
+INPUT_PORTS_END
+
+/****************************************************************************
+ CRU handling
+*****************************************************************************/
+
+#define CRU_CONTROL_BASE 0x1ee0
+#define CRU_SSTEP_BASE 0x13c0
+
+WRITE8_MEMBER ( geneve::cruwrite )
+{
+ int addroff = offset << 1;
+
+ // Single step
+ // 13c0 - 13fe: 0001 0011 11xx xxx0
+ if ((addroff & 0xffc0) == CRU_SSTEP_BASE)
+ {
+ int bit = (addroff & 0x003e)>>1;
+ if (VERBOSE>0) LOG("geneve: Single step not implemented; bit %d set to %d\n", bit, data);
+ return;
+ }
+
+ if ((addroff & 0xffe0) == CRU_CONTROL_BASE)
+ {
+ int bit = (addroff & 0x001e)>>1;
+ switch (bit)
+ {
+ case 5:
+ // No one really cares...
+ if (VERBOSE>8) LOG("geneve: Set PAL flag = %02x\n", data);
+ // m_palvideo = (data!=0);
+ break;
+ case 7:
+ // m_capslock = (data!=0);
+ if (VERBOSE>8) LOG("geneve: Set capslock flag = %02x\n", data);
+ break;
+ case 8:
+ if (VERBOSE>8) LOG("geneve: Set keyboard clock flag = %02x\n", data);
+ m_keyboard->clock_control((data!=0)? ASSERT_LINE : CLEAR_LINE);
+ break;
+ case 9:
+ if (VERBOSE>8) LOG("geneve: Set keyboard scan flag = %02x\n", data);
+ m_keyboard->send_scancodes((data!=0)? ASSERT_LINE : CLEAR_LINE);
+ break;
+ case 10:
+ if (VERBOSE>8) LOG("geneve: Geneve mode = %02x\n", data);
+ m_mapper->set_geneve_mode(data!=0);
+ break;
+ case 11:
+ if (VERBOSE>8) LOG("geneve: Direct mode = %02x\n", data);
+ m_mapper->set_direct_mode(data!=0);
+ break;
+ case 12:
+ if (VERBOSE>8) LOG("geneve: Cartridge size 8K = %02x\n", data);
+ m_mapper->set_cartridge_size((data!=0)? 0x2000 : 0x4000);
+ break;
+ case 13:
+ if (VERBOSE>8) LOG("geneve: Cartridge writable 6000 = %02x\n", data);
+ m_mapper->set_cartridge_writable(0x6000, (data!=0));
+ break;
+ case 14:
+ if (VERBOSE>8) LOG("geneve: Cartridge writable 7000 = %02x\n", data);
+ m_mapper->set_cartridge_writable(0x7000, (data!=0));
+ break;
+ case 15:
+ if (VERBOSE>8) LOG("geneve: Extra wait states = %02x\n", data==0);
+ m_mapper->set_extra_waitstates(data==0); // let's use the inverse semantics
+ break;
+ default:
+ if (VERBOSE>0) LOG("geneve: set CRU address %04x=%02x ignored\n", addroff, data);
+ break;
+ }
+ }
+ else
+ {
+ m_peribox->cruwrite(addroff, data);
+ }
+}
+
+READ8_MEMBER( geneve::cruread )
+{
+ UINT8 value = 0;
+ int addroff = offset << 4;
+
+ // Single step
+ // 13c0 - 13fe: 0001 0011 11xx xxx0
+ if ((addroff & 0xffc0) == CRU_SSTEP_BASE)
+ {
+ int bit = (addroff & 0x003e)>>1;
+ if (VERBOSE>0) LOG("geneve: Single step not implemented; attempting to read bit %d\n", bit);
+ return value;
+ }
+
+ // TMS9995-internal CRU locations (1ee0-1efe) are handled within the processor
+ // so we just don't arrive here
+
+ // Propagate the CRU access to external devices
+ m_peribox->crureadz(addroff, &value);
+ return value;
+}
+
+/***********************************************************************
+ CRU callbacks
+***********************************************************************/
+
+READ8_MEMBER( geneve::read_by_9901 )
+{
+ int answer = 0;
+
+ switch (offset & 0x03)
+ {
+ case TMS9901_CB_INT7:
+ //
+ // Read pins INT3*-INT7* of Geneve's 9901.
+ // bit 1: INTA status
+ // bit 2: INT2 status
+ // bit 3-7: joystick status
+ //
+ // |K|K|K|K|K|I2|I1|C|
+ // negative logic
+ if (m_inta==CLEAR_LINE) answer |= 0x02;
+ if (m_int2==CLEAR_LINE) answer |= 0x04;
+ answer |= m_joyport->read_port()<<3;
+ break;
+
+ case TMS9901_INT8_INT15:
+ // Read pins INT8*-INT15* of Geneve 9901.
+ //
+ // bit 0: keyboard interrupt
+ // bit 1: unused
+ // bit 2: mouse left button
+ // (bit 3: clock interrupt)
+ // bit 4: INTB from PE-bus
+ // bit 5 & 7: used as output
+ // bit 6: unused
+ if (m_keyint==CLEAR_LINE) answer |= 0x01;
+ if (m_mouse->left_button()==CLEAR_LINE) answer |= 0x04;
+ // TODO: add clock interrupt
+ if (m_intb==CLEAR_LINE) answer |= 0x10;
+ if (m_video_wait==ASSERT_LINE) answer |= 0x20;
+ // TODO: PAL pin 5
+ if (VERBOSE>8) LOG("geneve: INT15-8 = %02x\n", answer);
+ break;
+
+ case TMS9901_P0_P7:
+ // Read pins P0-P7 of TMS9901. All pins are configured as outputs, so nothing here.
+ break;
+
+ case TMS9901_P8_P15:
+ // Read pins P8-P15 of TMS 9901.
+ // bit 4: mouse left button
+ // video wait is an output; no input possible here
+ if (m_intb==CLEAR_LINE) answer |= 0x04; // mirror from above
+ // TODO: 0x08 = real-time clock int
+ if (m_mouse->left_button()==CLEAR_LINE) answer |= 0x10; // mirror from above
+ if (m_keyint==CLEAR_LINE) answer |= 0x40;
+
+ // Joystick up (mirror of bit 7)
+ if ((m_joyport->read_port() & 0x10)==0) answer |= 0x80;
+ break;
+ }
+ return answer;
+}
+
+/*
+ Write PE bus reset line
+*/
+WRITE_LINE_MEMBER( geneve::peripheral_bus_reset )
+{
+ if (VERBOSE>0) LOG("geneve: peripheral bus reset request; not implemented yet.\n");
+}
+
+/*
+ Write VDP reset line
+*/
+WRITE_LINE_MEMBER( geneve::VDP_reset )
+{
+ if (VERBOSE>0) LOG("geneve: Video reset request; not implemented yet.\n");
+}
+
+/*
+ Write joystick select line. 1 selects joystick 1 (pin 7), 0 selects joystick 2 (pin 2)
+*/
+WRITE_LINE_MEMBER( geneve::joystick_select )
+{
+ m_joyport->write_port((state==ASSERT_LINE)? 1:2);
+}
+
+/*
+ Write external mem cycles (0=long, 1=short)
+*/
+WRITE_LINE_MEMBER( geneve::extbus_wait_states )
+{
+ if (VERBOSE>0) LOG("geneve: external bus wait states set to %d, not implemented yet.\n", state);
+}
+
+/*
+ Write vdp wait cycles (1=add 14 cycles, 0=add none)
+ see above for waitstate handling
+*/
+WRITE_LINE_MEMBER( geneve::video_wait_states )
+{
+ if (VERBOSE>1) LOG("geneve: video wait states set to %d\n", state);
+ m_mapper->set_video_waitstates(state==ASSERT_LINE);
+ m_video_wait = (state!=0)? ASSERT_LINE : CLEAR_LINE;
+}
+
+/*
+ Called by the 9901 core whenever the state of INTREQ and IC0-3 changes.
+ As with the TI-99/4A, the interrupt level is delivered as the offset,
+ but again it is ignored. Anyway, the TMS9995 has only two external inputs
+ (INT1 and INT4).
+*/
+WRITE8_MEMBER( geneve::tms9901_interrupt )
+{
+ /* INTREQ is connected to INT1. */
+ device_execute(m_cpu)->set_input_line(INPUT_LINE_99XX_INT1, data);
+}
+
+/* tms9901 setup */
+const tms9901_interface tms9901_wiring_geneve =
+{
+ TMS9901_INT1 | TMS9901_INT2 | TMS9901_INT8 | TMS9901_INTB | TMS9901_INTC, /* only input pins whose state is always known */
+
+ // read handler
+ DEVCB_DRIVER_MEMBER(geneve, read_by_9901),
+
+ { /* write handlers */
+ DEVCB_DRIVER_LINE_MEMBER(geneve, peripheral_bus_reset),
+ DEVCB_DRIVER_LINE_MEMBER(geneve, VDP_reset),
+ DEVCB_DRIVER_LINE_MEMBER(geneve, joystick_select),
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_DEVICE_LINE_MEMBER(GKEYBOARD_TAG, geneve_keyboard_device, reset_line),
+ DEVCB_DRIVER_LINE_MEMBER(geneve, extbus_wait_states),
+ DEVCB_NULL,
+ DEVCB_DRIVER_LINE_MEMBER(geneve, video_wait_states),
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL
+ },
+
+ /* interrupt handler */
+ DEVCB_DRIVER_MEMBER(geneve, tms9901_interrupt)
+};
+
+/*******************************************************************
+ Signal lines
+*******************************************************************/
+/*
+ inta is connected to both tms9901 IRQ1 line and to tms9995 INT4/EC line.
+*/
+WRITE_LINE_MEMBER( geneve::inta )
+{
+ m_inta = (state!=0)? ASSERT_LINE : CLEAR_LINE;
+ m_tms9901->set_single_int(1, state);
+ device_execute(m_cpu)->set_input_line(INPUT_LINE_99XX_INT4, state);
+}
+
+/*
+ intb is connected to tms9901 IRQ12 line.
+*/
+WRITE_LINE_MEMBER( geneve::intb )
+{
+ m_intb = (state!=0)? ASSERT_LINE : CLEAR_LINE;
+ m_tms9901->set_single_int(12, state);
+}
+
+WRITE_LINE_MEMBER( geneve::ext_ready )
+{
+ if (VERBOSE>6) LOG("ti99_8: READY level (ext) =%02x\n", state);
+ m_ready_line = state;
+ m_cpu->set_ready((m_ready_line == ASSERT_LINE && m_ready_line1 == ASSERT_LINE)? ASSERT_LINE : CLEAR_LINE);
+}
+
+WRITE_LINE_MEMBER( geneve::mapper_ready )
+{
+ if (VERBOSE>6) LOG("geneve: READY level (mapper) = %02x\n", state);
+ m_ready_line1 = state;
+ m_cpu->set_ready((m_ready_line == ASSERT_LINE && m_ready_line1 == ASSERT_LINE)? ASSERT_LINE : CLEAR_LINE);
+}
+
+/*
+ set the state of int2 (called by the v9938 core)
+*/
+void geneve::set_tms9901_INT2_from_v9938(v99x8_device &vdp, int state)
+{
+ m_int2 = (state!=0)? ASSERT_LINE : CLEAR_LINE;
+ m_tms9901->set_single_int(2, state);
+}
+
+/*
+ Interrupt from the keyboard.
+*/
+WRITE_LINE_MEMBER( geneve::keyboard_interrupt )
+{
+ m_keyint = (state!=0)? ASSERT_LINE : CLEAR_LINE;
+ m_tms9901->set_single_int(8, state);
+}
+
+/*
+ scanline interrupt
+*/
+TIMER_DEVICE_CALLBACK( geneve_hblank_interrupt )
+{
+ int scanline = param;
+ geneve *driver = timer.machine().driver_data<geneve>();
+
+ timer.machine().device<v9938_device>(VDP_TAG)->interrupt();
+
+ if (scanline == 0) // was 262
+ {
+ // TODO
+ // The technical docs do not say anything about the way the mouse
+ // is queried. It sounds plausible that the mouse is sampled once
+ // per vertical interrupt; however, the mouse sometimes shows jerky
+ // behaviour. Maybe we should use an autonomous timer with a higher
+ // rate? -> to be checked
+ driver->m_mouse->poll();
+ }
+}
+
+WRITE8_MEMBER( geneve::external_operation )
+{
+ static const char* extop[8] = { "inv1", "inv2", "IDLE", "RSET", "inv3", "CKON", "CKOF", "LREX" };
+ if (VERBOSE>1)
+ if (offset != IDLE_OP) LOG("geneve: External operation %s not implemented on Geneve board\n", extop[offset]);
+}
+
+/*
+ Clock line from the CPU. Used to control wait state generation.
+*/
+WRITE_LINE_MEMBER( geneve::clock_out )
+{
+ m_mapper->clock_in(state);
+}
+
+static TMS9995_CONFIG( geneve_processor_config )
+{
+ DEVCB_DRIVER_MEMBER(geneve, external_operation),
+ DEVCB_NULL, // Instruction acquisition
+ DEVCB_DRIVER_LINE_MEMBER(geneve, clock_out),
+ DEVCB_NULL, // wait
+ DEVCB_NULL, // HOLDA
+ INTERNAL_RAM, // use internal RAM
+ NO_OVERFLOW_INT // The generally available versions of TMS9995 have a deactivated overflow interrupt
+};
+
+static TI_SOUND_CONFIG( sound_conf )
+{
+ DEVCB_DRIVER_LINE_MEMBER(geneve, ext_ready) // READY
+};
+
+static const mm58274c_interface geneve_mm58274c_interface =
+{
+ 1, /* mode 24*/
+ 0 /* first day of week */
+};
+
+static GENEVE_KEYBOARD_CONFIG( geneve_keyb_conf )
+{
+ DEVCB_DRIVER_LINE_MEMBER(geneve, keyboard_interrupt)
+};
+
+static PERIBOX_CONFIG( peribox_conf )
+{
+ DEVCB_DRIVER_LINE_MEMBER(geneve, inta), // INTA
+ DEVCB_DRIVER_LINE_MEMBER(geneve, intb), // INTB
+ DEVCB_DRIVER_LINE_MEMBER(geneve, ext_ready), // READY
+ 0x00000 // Address bus prefix (Mapper will produce prefixes)
+};
+
+static GENEVE_MAPPER_CONFIG( mapper_conf )
+{
+ DEVCB_DRIVER_LINE_MEMBER(geneve, mapper_ready) // READY
+};
+
+static JOYPORT_CONFIG( joyport_60 )
+{
+ DEVCB_NULL,
+ 60
+};
+
+DRIVER_INIT_MEMBER(geneve,geneve)
+{
+}
+
+static MACHINE_START( geneve )
+{
+ geneve *driver = machine.driver_data<geneve>();
+ driver->m_tms9901 = static_cast<tms9901_device*>(machine.device(TMS9901_TAG));
+ driver->m_mapper = static_cast<geneve_mapper_device*>(machine.device(GMAPPER_TAG));
+ driver->m_keyboard = static_cast<geneve_keyboard_device*>(machine.device(GKEYBOARD_TAG));
+ driver->m_peribox = static_cast<peribox_device*>(machine.device(PERIBOX_TAG));
+ driver->m_mouse = static_cast<geneve_mouse_device*>(machine.device(GMOUSE_TAG));
+ driver->m_cpu = static_cast<tms9995_device*>(machine.device("maincpu"));
+ driver->m_joyport = static_cast<joyport_device*>(machine.device(JOYPORT_TAG));
+}
+
+/*
+ Reset the machine.
+*/
+static MACHINE_RESET( geneve )
+{
+ geneve *driver = machine.driver_data<geneve>();
+ driver->m_inta = CLEAR_LINE; // flag reflecting the INTA line
+ driver->m_intb = CLEAR_LINE; // flag reflecting the INTB line
+ driver->m_int2 = CLEAR_LINE; // flag reflecting the INT2 line
+ driver->m_keyint = CLEAR_LINE;
+
+ // No automatic wait state (auto wait state is enabled with READY=CLEAR at RESET)
+ driver->m_cpu->set_ready(ASSERT_LINE);
+ driver->m_cpu->set_hold(CLEAR_LINE);
+
+ driver->m_ready_line = driver->m_ready_line1 = ASSERT_LINE;
+
+ driver->m_peribox->set_genmod(machine.root_device().ioport("MODE")->read()==GENMOD);
+
+ driver->m_joyport->write_port(0x01); // select Joystick 1
+}
+
+static MACHINE_CONFIG_START( geneve_60hz, geneve )
+ // basic machine hardware
+ // TMS9995 CPU @ 12.0 MHz
+ MCFG_TMS9995_ADD("maincpu", TMS9995, 12000000, memmap, crumap, geneve_processor_config)
+
+ MCFG_MACHINE_START( geneve )
+ MCFG_MACHINE_RESET( geneve )
+
+ // video hardware
+ // Although we should have a 60 Hz screen rate, we have to set it to 30 here.
+ // The reason is that that the number of screen lines is counted twice for the
+ // interlace mode, but in non-interlace modes only half of the lines are
+ // painted. Accordingly, the full set of lines is refreshed at 30 Hz,
+ // not 60 Hz. This should be fixed in the v9938 emulation.
+ MCFG_TI_V9938_ADD(VIDEO_SYSTEM_TAG, 30, SCREEN_TAG, 2500, 512+32, (212+28)*2, DEVICE_SELF, geneve, set_tms9901_INT2_from_v9938)
+ MCFG_TIMER_ADD_SCANLINE("scantimer", geneve_hblank_interrupt, SCREEN_TAG, 0, 1) /* 262.5 in 60Hz, 312.5 in 50Hz */
+
+ // Main board components
+ MCFG_TMS9901_ADD(TMS9901_TAG, tms9901_wiring_geneve, 3000000)
+ MCFG_GENEVE_MAPPER_ADD(GMAPPER_TAG, mapper_conf)
+ MCFG_MM58274C_ADD(GCLOCK_TAG, geneve_mm58274c_interface)
+
+ // Peripheral expansion box (Geneve composition)
+ MCFG_PERIBOX_GEN_ADD( PERIBOX_TAG, peribox_conf )
+
+ // sound hardware
+ MCFG_TI_SOUND_76496_ADD( TISOUND_TAG, sound_conf )
+
+ // User interface devices
+ MCFG_GENEVE_KEYBOARD_ADD( GKEYBOARD_TAG, geneve_keyb_conf )
+ MCFG_GENEVE_MOUSE_ADD( GMOUSE_TAG )
+ MCFG_GENEVE_JOYPORT_ADD( JOYPORT_TAG, joyport_60 )
+
+MACHINE_CONFIG_END
+
+/*
+ ROM loading
+*/
+
+ROM_START(geneve)
+ /*CPU memory space*/
+ ROM_REGION(0xc000, "maincpu", 0)
+ ROM_LOAD("genbt100.bin", 0x0000, 0x4000, CRC(8001e386) SHA1(b44618b54dabac3882543e18555d482b299e0109)) /* CPU ROMs v1.0 */
+ ROM_LOAD_OPTIONAL("genbt098.bin", 0x4000, 0x4000, CRC(b2e20df9) SHA1(2d5d09177afe97d63ceb3ad59b498b1c9e2153f7)) /* CPU ROMs v0.98 */
+ ROM_LOAD_OPTIONAL("gnmbt100.bin", 0x8000, 0x4000, CRC(19b89479) SHA1(6ef297eda78dc705946f6494e9d7e95e5216ec47)) /* CPU ROMs GenMod */
+
+ ROM_REGION(SRAM_SIZE, SRAM_TAG, 0)
+ ROM_FILL(0x0000, SRAM_SIZE, 0)
+
+ ROM_REGION(DRAM_SIZE, DRAM_TAG, 0)
+ ROM_FILL(0x0000, DRAM_SIZE, 0)
+ROM_END
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */
+COMP( 1987,geneve, 0, 0, geneve_60hz, geneve, geneve, geneve, "Myarc", "Geneve 9640" , 0)