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nec/pc88va.cpp: preliminary C-Bus slot hookup
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angelosa
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8fdb48c203
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16817fba26
@ -3,57 +3,55 @@
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// thanks-to: Fujix
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/**************************************************************************************************
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PC-88VA (c) 1987 NEC
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PC-88VA (c) 1987 NEC
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Here be dragons, a mostly compatible PC-8801 with extra V3 Mode for superset.
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Here be dragons, a mostly compatible PC-8801 with extra V3 Mode for superset.
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preliminary driver by Angelo Salese
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Special thanks to Fujix for his documentation translation help
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TODO:
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- pc88va (stock version) has two bogus opcodes.
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One is at 0xf0b15 (0x0f 0xfe), another at 0xf0b31 (br 1000h:0c003h).
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Latter will make the program flow to jump to lalaland.
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This also happens if you load a regular V1/V2 game assuming you have FDC PIO properly
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hooked up, is the first opcode actually a Z80 mode switch?
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- pc88va is also known to have a slightly different banking scheme and
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regular YM2203 as default sound board.
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- video emulation is lacking many features, cfr. pc88va_v.cpp;
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- keyboard runs on undumped MCU, we currently stick irqs together on
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selected keys in order to have an easier QoL while testing this.
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- Backport from PC-8801 main map, apply supersets where applicable;
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\- IDP has EMUL for upd3301
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\- In emulation mode HW still relies to a i8214, so it bridges thru
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main ICU in cascaded mode via IRQ7;
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\- beeper or dac1bit (to be confirmed);
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\- (other stuff ...)
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- Convert FDC usage to pc88va2_fd_if_device, we also need PIO comms for sorcer anyway;
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- irq dispatch needs to be revisited, too many instances of sound irq failing for example.
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The current hook-ups aren't legal, V50 core bug?
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- Very inconsistent SW boot behaviours, either down to:
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\- the current hack in FDC PIO port returning RNG;
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\- V50 timings;
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\- FDC;
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- Every PC Engine OS boot tries to write TVRAM ASCII data on every boot to
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$exxxx ROM region, banking bug?
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- all N88 BASIC entries tries to do stuff with EMM, more banking?
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- Convert SASI from PC-9801 to a shared C-Bus device, apparently it's same i/f;
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- Is C-Bus I/O space shifted by +$200, as per micromus MIDI access at $e2d2?
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TODO:
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- pc88va (stock version) has two bogus opcodes.
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One is at 0xf0b15 (0x0f 0xfe), another at 0xf0b31 (br 1000h:0c003h).
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Latter will make the program flow to jump to lalaland.
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This also happens if you load a regular V1/V2 game assuming you have FDC PIO properly
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hooked up, is the first opcode actually a Z80 mode switch?
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- pc88va is also known to have a slightly different banking scheme and
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regular YM2203 as default sound board.
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- video emulation is lacking many features, cfr. pc88va_v.cpp;
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- keyboard runs on undumped MCU, we currently stick irqs together on
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selected keys in order to have an easier QoL while testing this.
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- Backport from PC-8801 main map, apply supersets where applicable;
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\- IDP has EMUL for upd3301
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\- In emulation mode HW still relies to a i8214, so it bridges thru
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main ICU in cascaded mode via IRQ7;
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\- beeper or dac1bit (to be confirmed);
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\- (other stuff ...)
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- Convert FDC usage to pc88va2_fd_if_device, we also need PIO comms for sorcer anyway;
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- irq dispatch needs to be revisited, too many instances of sound irq failing for example.
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The current hook-ups aren't legal, V50 core bug?
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- Very inconsistent SW boot behaviours, either down to:
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\- the current hack in FDC PIO port returning RNG;
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\- V50 timings;
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\- FDC;
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- Every PC Engine OS boot tries to write TVRAM ASCII data on every boot to
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$exxxx ROM region, banking bug?
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- all N88 BASIC entries tries to do stuff with EMM, more banking?
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- Convert SASI from PC-9801 to a shared device, apparently it's same i/f;
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- Implement bus slot, which should still be PC-8801 EXPansion bus.
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(old notes, to be reordered)
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- fdc "intelligent mode" has 0x7f as irq vector ... 0x7f is ld a,a and it IS NOT correctly
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hooked up by the current z80 core
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- Fix floppy motor hook-up (floppy believes to be always in even if empty drive);
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- Support for PC8801 compatible mode & PC80S31K (floppy interface);
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(old notes, to be reordered)
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- fdc "intelligent mode" has 0x7f as irq vector ... 0x7f is ld a,a and it IS NOT correctly
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hooked up by the current z80 core
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- Fix floppy motor hook-up (floppy believes to be always in even if empty drive);
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- Support for PC8801 compatible mode & PC80S31K (floppy interface);
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Notes:
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- hold F8 at POST to bring software dip settings menu
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- PC-88VA-91 is a ROM upgrade kit for a PC-88VA -> VA2/VA3.
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Has four roms, marked by VAEG as VUROM00.ROM, VUROM08.ROM, VUROM1.ROM, VUDIC.ROM.
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Notes:
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- hold F8 at POST to bring software dip settings menu
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- PC-88VA-91 is a ROM upgrade kit for a PC-88VA -> VA2/VA3.
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Has four roms, marked by VAEG as VUROM00.ROM, VUROM08.ROM, VUROM1.ROM, VUDIC.ROM.
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References:
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- PC-88VAテクニカルマニュアル
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- http://www.pc88.gr.jp/vafaq/view.php/articlelist/88va/vafaq
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References:
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- PC-88VAテクニカルマニュアル
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- http://www.pc88.gr.jp/vafaq/view.php/articlelist/88va/vafaq
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- I/O magazine 1987 08 (schematics)
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===================================================================================================
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@ -62,15 +60,15 @@ ICU
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irq 0 - 08h - timer 1
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irq 1 - 09h - keyboard irq
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irq 2 - 0Ah - VRTC
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irq 3 - 0Bh - UINT0 (B24)
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irq 3 - 0Bh - UINT0 (B24) C-Bus IR3
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irq 4 - 0Ch - RS-232C
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irq 5 - 0Dh - UINT1 (B25)
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irq 6 - 0Eh - UINT2 (B26)
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irq 5 - 0Dh - UINT1 (B25) C-Bus IR5
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irq 6 - 0Eh - UINT2 (B26) C-Bus IR6
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irq 7 - N/A - Slave (either secondary i8259 or i8214)
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i8259 slave
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irq 8 - 10H - SGP
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irq 9 - 11H - UINT3 (HDD, B27)
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irq 10 - 12H - UINT4 (B28)
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irq 9 - 11H - UINT3 (HDD, B27) C-Bus IR9
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irq 10 - 12H - UINT4 (B28) C-Bus IR10
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irq 11 - 13H - FDC
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irq 12 - 14H - Sound
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irq 13 - 15H - General timer 3 (mouse)
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@ -1120,6 +1118,47 @@ void pc88va_state::machine_reset()
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m_sound_irq_pending = false;
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}
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// TODO: add just a subset for now, all needs to be verified if compatible with C-Bus.
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static void pc88va_cbus_devices(device_slot_interface &device)
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{
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device.option_add("pc9801_55u", PC9801_55U);
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device.option_add("pc9801_55l", PC9801_55L);
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device.option_add("mpu_pc98", MPU_PC98);
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}
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// NOTE: PC-88VA implementation omits some C-Bus lines compared to PC-98.
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// - doesn't have ir12 and ir13, i.e. covers INT0 to INT4 only
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// - no /CPUKILL pin support
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// cfr. schematics pg. 260, "external bus, videoboard connector"
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void pc88va_state::pc88va_cbus(machine_config &config)
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{
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PC9801CBUS_SLOT(config, m_cbus[0], pc88va_cbus_devices, nullptr);
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m_cbus[0]->set_memspace(m_maincpu, AS_PROGRAM);
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m_cbus[0]->set_iospace(m_maincpu, AS_IO);
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m_cbus[0]->int_cb<0>().set("ir3", FUNC(input_merger_device::in_w<0>));
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m_cbus[0]->int_cb<1>().set("ir5", FUNC(input_merger_device::in_w<0>));
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m_cbus[0]->int_cb<2>().set("ir6", FUNC(input_merger_device::in_w<0>));
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m_cbus[0]->int_cb<3>().set("ir9", FUNC(input_merger_device::in_w<0>));
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m_cbus[0]->int_cb<4>().set("ir10", FUNC(input_merger_device::in_w<0>));
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PC9801CBUS_SLOT(config, m_cbus[1], pc88va_cbus_devices, nullptr);
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m_cbus[1]->set_memspace(m_maincpu, AS_PROGRAM);
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m_cbus[1]->set_iospace(m_maincpu, AS_IO);
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m_cbus[1]->int_cb<0>().set("ir3", FUNC(input_merger_device::in_w<1>));
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m_cbus[1]->int_cb<1>().set("ir5", FUNC(input_merger_device::in_w<1>));
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m_cbus[1]->int_cb<2>().set("ir6", FUNC(input_merger_device::in_w<1>));
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m_cbus[1]->int_cb<3>().set("ir9", FUNC(input_merger_device::in_w<1>));
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m_cbus[1]->int_cb<4>().set("ir10", FUNC(input_merger_device::in_w<1>));
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// TODO: check actual number of slots for each VA iteration
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INPUT_MERGER_ANY_HIGH(config, "ir3").output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ3);
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INPUT_MERGER_ANY_HIGH(config, "ir5").output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ5);
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INPUT_MERGER_ANY_HIGH(config, "ir6").output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ6);
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INPUT_MERGER_ANY_HIGH(config, "ir9").output_handler().set("pic8259_slave", FUNC(pic8259_device::ir1_w));
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INPUT_MERGER_ANY_HIGH(config, "ir10").output_handler().set("pic8259_slave", FUNC(pic8259_device::ir2_w));
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}
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void pc88va_state::pc88va(machine_config &config)
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{
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V50(config, m_maincpu, MASTER_CLOCK); // μPD9002, aka V50 + μPD70008AC (for PC8801 compatibility mode) in place of 8080
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@ -1138,6 +1177,8 @@ void pc88va_state::pc88va(machine_config &config)
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m_maincpu->in_memr_cb().set([this] (offs_t offset) { return m_maincpu->space(AS_PROGRAM).read_byte(offset); });
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m_maincpu->out_memw_cb().set([this] (offs_t offset, u8 data) { m_maincpu->space(AS_PROGRAM).write_byte(offset, data); });
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pc88va_cbus(config);
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// TODO: pc80s31k here
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SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
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@ -14,18 +14,29 @@
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//#include "pc80s31k.h"
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#include "pc88va_sgp.h"
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#include "bus/cbus/pc9801_cbus.h"
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#include "bus/msx/ctrl/ctrl.h"
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#include "cpu/nec/v5x.h"
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#include "cpu/z80/z80.h"
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#include "imagedev/floppy.h"
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#include "machine/bankdev.h"
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#include "machine/i8255.h"
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#include "machine/input_merger.h"
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#include "machine/pic8259.h"
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#include "machine/timer.h"
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#include "machine/upd1990a.h"
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#include "machine/upd765.h"
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#include "sound/ymopn.h"
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//#include "bus/cbus/amd98.h"
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//#include "bus/cbus/pc9801_26.h"
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#include "bus/cbus/pc9801_55.h"
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//#include "bus/cbus/pc9801_86.h"
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//#include "bus/cbus/pc9801_118.h"
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#include "bus/cbus/mpu_pc98.h"
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//#include "bus/cbus/sb16_ct2720.h"
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#include "emupal.h"
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#include "screen.h"
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#include "softlist.h"
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@ -46,6 +57,7 @@ public:
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, m_fdd(*this, "upd765:%u", 0U)
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, m_pic2(*this, "pic8259_slave")
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, m_rtc(*this, "rtc")
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, m_cbus(*this, "cbus%d", 0)
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, m_mouse_port(*this, "mouseport") // labelled "マウス" (mouse) - can't use "mouse" because of core -mouse option
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, m_opna(*this, "opna")
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, m_lspeaker(*this, "lspeaker")
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@ -97,6 +109,9 @@ protected:
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virtual void video_start() override ATTR_COLD;
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void palette_init(palette_device &palette) const;
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protected:
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void pc88va_cbus(machine_config &config);
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private:
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required_device<v50_device> m_maincpu;
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@ -107,6 +122,7 @@ private:
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// required_device<pic8259_device> m_pic1;
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required_device<pic8259_device> m_pic2;
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required_device<upd4990a_device> m_rtc;
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required_device_array<pc9801_slot_device, 2> m_cbus;
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required_device<msx_general_purpose_port_device> m_mouse_port;
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required_device<ym2608_device> m_opna;
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required_device<speaker_device> m_lspeaker;
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