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(MESS) cat.c: significantly updated the IAI Swyft driver: added preliminary guru-style readme of the swyft pcb, prepared for hooking up the VIAs [Lord Nightmare, Sandy Bumgarner, Dwight Elvey]
This commit is contained in:
Jonathan Gevaryahu
parent
2f2e8e1c0c
commit
04e1e0b551
@ -129,6 +129,7 @@ enum
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XTAL_15MHz = 15000000, /* Sinclair QL */
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XTAL_15_36MHz = 15360000, /* Visual 1050 */
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XTAL_15_468MHz = 15468480, /* Bank Panic h/w, Sega G80 */
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XTAL_15_8976MHz = 15897600, /* IAI Swyft */
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XTAL_16MHz = 16000000, /* Extremely common, used on 100's of PCBs */
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XTAL_16_384MHz = 16384000,
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XTAL_16_9344MHz = 16934400, /* Usually used to drive 90's Yamaha OPL/FM chips (44100 * 384) */
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@ -159,7 +159,43 @@ X2: 3.579545Mhz, used by the DTMF generator chip AMI S2579 at IC40
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X3: 2.4576Mhz, used by the modem chip AMI S35213 at IC37
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IAI Swyft:
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<insert guru-diagram here once drawn>
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Board name: 950-0001C
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"INFORMATION APPLIANCE INC. COPYRIGHT 1985"
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_________________|||||||||_____________________________________________________________________________
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| video out [unknown IDC connector]____ |
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| / \ |
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<4 pin edge) 74LS107 |PB1 | uA339 MC3403 |
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| 7407 \____/ |
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| Y1 "TIMING B" 74LS132 74LS175 |
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| ____________ |
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| TMS4256 74LS161 "DECODE E" "DISK 3.5C" | | 4N37 |
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| | MC6850P | -----|
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| TMS4256 74LS166 74HCT259 74LS299 '------------' MC3403 MC3403 LINE =
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| ___________________ ___________________ -----|
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| TMS4256 74LS373 | | | | PHONE=
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| | MC68008P8 | | R6522P | -----|
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| TMS4256 74F153 '-------------------' '-------------------' MN4053 MN4053 .-----|
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| (jumper E1) |J1 =
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| TMS4256 74F153 74HCT08 __________ ___________________ MC14412 DS1489 | B =
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| | | | | || | R =
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| TMS4256 74F153 74HC4040E | 27C256 | | R6522P | || | E =
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| '----------' '-------------------' || | A =
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| TMS4256 74F153 "VIDEO 2B" .----------. J4 | K =
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| | 27C256 | 74HC02 74HC374 || | O =
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| TMS4256 74F153 74LS393 |__________| || UM95089 Y2 | U =
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|_____________________________________(j9)________________________________________________________|_T___=
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"TIMING B" - AMPAL16R4APC (marked on silkscreen "TIMING PAL")
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"DECODE E" - AMPAL16L8 (marked on silkscreen "DECODE PAL")
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"VIDEO 2B" - AMPAL16RAPC (marked on silkscreen "VIDEO PAL")
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"DISK 3.5C" - AMPAL16R4PC (marked on silkscreen "DISK PAL")
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4N37 (marked on silkscreen "4N35")
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74F153 (marked on silkscreen "74ALS153")
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TMS4256-15NL - 262144 x 1 DRAM
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PB1 - piezo speaker
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Crystals:
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Y1: 15.8796Mhx, main clock?
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Y2: 3.579545Mhz, used by the DTMF generator chip UM95089?
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ToDo:
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@ -256,6 +292,7 @@ ToDo:
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#include "cpu/m68000/m68000.h"
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#include "machine/n68681.h"
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#include "machine/6850acia.h"
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#include "machine/6522via.h"
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#include "machine/nvram.h"
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class cat_state : public driver_device
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@ -264,8 +301,7 @@ public:
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enum
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{
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TIMER_KEYBOARD,
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TIMER_COUNTER_6MS,
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TIMER_SWYFT_RESET
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TIMER_COUNTER_6MS
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};
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cat_state(const machine_config &mconfig, device_type type, const char *tag)
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@ -274,6 +310,8 @@ public:
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//m_nvram(*this, "nvram"), // merge with svram?
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m_duart(*this, "duartn68681"),
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m_acia(*this, "acia6850"),
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m_via0(*this, "via6522_0"),
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m_via1(*this, "via6522_1"),
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//m_speaker(*this, "speaker"),
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m_svram(*this, "svram"), // nvram
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m_p_videoram(*this, "p_videoram"),
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@ -292,6 +330,8 @@ public:
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//optional_device<nvram_device> m_nvram;
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optional_device<duartn68681_device> m_duart; // only cat uses this
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optional_device<acia6850_device> m_acia; // only swyft uses this
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optional_device<via6522_device> m_via0; // only swyft uses this
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optional_device<via6522_device> m_via1; // only swyft uses this
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DECLARE_WRITE_LINE_MEMBER(cat_duart_irq_handler);
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DECLARE_WRITE_LINE_MEMBER(cat_duart_txa);
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DECLARE_READ8_MEMBER(cat_duart_input);
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@ -360,7 +400,6 @@ public:
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//TIMER_CALLBACK_MEMBER(keyboard_callback);
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TIMER_CALLBACK_MEMBER(counter_6ms_callback);
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TIMER_CALLBACK_MEMBER(swyft_reset);
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IRQ_CALLBACK_MEMBER(cat_int_ack);
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protected:
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@ -720,20 +759,20 @@ ADDRESS_MAP_END
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a23 a22 a21 a20 a19 a18 a17 a16 a15 a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a4 a3 a2 a1 (a0 via UDS/LDS)
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? ? ? ? 0 0 ? ? * * * * * * * * * * * * * * * a R ROM (a=0 is low, a=1 is high)
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? ? ? ? 0 1 * * * * * * * * * * * * * * * * * a RW RAM
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? ? ? ? 1 1 ?0? ?1? ? ? ? ? ? ? ? ? ? ? ? ? * * * * R ? status of something?
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? ? ? ? 1 1 ?1? ?0? ? 0 0 1 ? ? ? ? ? ? ? ? ? ? ? ? W 6850 acia control reg lives here, gets 0x55 steadystate and 0x57 written to it to reset it
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? ? ? ? 1 1 ?1? ?0? ? 0 1 0 ? ? * * * * ?*? ? ? ? ? ? RW ? i/o kb and floppy as well?\_ io and the modem chip too?
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? ? ? ? 1 1 ?1? ?0? ? 1 0 0 ? ? * * * * ?*? ? ? ? ? ? RW ? i/o kb and floppy as well?/
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? ? ? ? 1 1 ?0? ?1? ? ? ? ? ? ? ? ? ? ? ? ? * * * * R ? status of something? floppy?
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? ? ? ? 1 1 ?1? ?0? ? 0 0 1 ? ? ? ? ? ? ? ? ? ? ? ? ?R?W 6850 acia control reg lives here, gets 0x55 steadystate and 0x57 written to it to reset it
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? ? ? ? 1 1 ?1? ?0? ? 0 1 0 ? ? * * * * ?*? ? ? ? ? ? RW VIA 0
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? ? ? ? 1 1 ?1? ?0? ? 1 0 0 ? ? * * * * ?*? ? ? ? ? ? RW VIA 1
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^ ^ ^ ^ ^
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*/
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static ADDRESS_MAP_START(swyft_mem, AS_PROGRAM, 16, cat_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x000000, 0x00ffff) AM_ROM AM_MIRROR(0xF00000) // 64 KB ROM
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AM_RANGE(0x040000, 0x07ffff) AM_RAM AM_MIRROR(0xF00000) AM_SHARE("p_videoram")
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AM_RANGE(0x040000, 0x07ffff) AM_RAM AM_MIRROR(0xF00000) AM_SHARE("p_videoram") // 256 KB RAM
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//AM_RANGE(0x0d0000, 0x0d000f) AM_READ(unknown_d0004) // status of something? reads from d0000, d0004, d0008, d000a, d000e
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AM_RANGE(0x0e1000, 0x0e1001) AM_DEVWRITE8("acia6850", acia6850_device, control_write, 0xFF00) // 6850 ACIA lives here
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// where are the other 3 acia registers?
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// where are the other 3 acia registers? e1002-e1003, and read/write for each?
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//AM_RANGE(0x0e2000, 0x0e2fff) AM_READWRITE(unknown_e2000) // io area with selector on a9 a8 a7 a6?
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//AM_RANGE(0x0e4000, 0x0e4fff) AM_READWRITE(unknown_e4000) // there's likely a modem chip mapped around somewhere
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ADDRESS_MAP_END
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@ -857,9 +896,6 @@ void cat_state::device_timer(emu_timer &timer, device_timer_id id, int param, vo
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case TIMER_COUNTER_6MS:
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counter_6ms_callback(ptr, param);
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break;
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case TIMER_SWYFT_RESET:
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swyft_reset(ptr, param);
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break;
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default:
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assert_always(FALSE, "Unknown id in cat_state::device_timer");
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}
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@ -934,11 +970,6 @@ UINT32 cat_state::screen_update_cat(screen_device &screen, bitmap_ind16 &bitmap,
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return 0;
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}
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TIMER_CALLBACK_MEMBER(cat_state::swyft_reset)
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{
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//memset(m_maincpu->space(AS_PROGRAM).get_read_ptr(0xe2341), 0xff, 1);
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}
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MACHINE_START_MEMBER(cat_state,swyft)
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{
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//m_6ms_timer = timer_alloc(TIMER_COUNTER_6MS); // CRUDE HACK
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@ -946,7 +977,6 @@ MACHINE_START_MEMBER(cat_state,swyft)
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MACHINE_RESET_MEMBER(cat_state,swyft)
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{
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//timer_set(attotime::from_usec(10), TIMER_SWYFT_RESET);
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//m_maincpu->set_irq_acknowledge_callback(device_irq_acknowledge_delegate(FUNC(cat_state::cat_int_ack),this));
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//m_6ms_timer->adjust(attotime::zero, 0, attotime::from_hz((XTAL_19_968MHz/2)/65536)); // horrible hack
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}
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@ -1040,17 +1070,6 @@ static const duartn68681_config cat_duart_config =
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DEVCB_DRIVER_MEMBER(cat_state, cat_duart_output), /* output port */
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};
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static const acia6850_interface swyft_acia_config =
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{
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3579545, // guess
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3579545, // guess
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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};
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static MACHINE_CONFIG_START( cat, cat_state )
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/* basic machine hardware */
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@ -1078,10 +1097,56 @@ static MACHINE_CONFIG_START( cat, cat_state )
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MCFG_NVRAM_ADD_0FILL("nvram")
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MACHINE_CONFIG_END
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static const acia6850_interface swyft_acia_config =
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{
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3579545, // guess
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3579545, // guess
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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};
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static const via6522_interface swyft_via0_config =
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{
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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};
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static const via6522_interface swyft_via1_config =
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{
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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DEVCB_NULL,
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};
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static MACHINE_CONFIG_START( swyft, cat_state )
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/* basic machine hardware */
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MCFG_CPU_ADD("maincpu",M68000, XTAL_5MHz) // guess
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//MCFG_CPU_ADD("maincpu",M68008, XTAL_15_8976MHz/2) //MC68008P8, Y1=15.8796Mhz, clock GUESSED at Y1 / 2
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MCFG_CPU_ADD("maincpu",M68000, XTAL_15_8976MHz/2) //MC68008P8, Y1=15.8796Mhz, clock GUESSED at Y1 / 2
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MCFG_CPU_PROGRAM_MAP(swyft_mem)
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MCFG_MACHINE_START_OVERRIDE(cat_state,swyft)
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