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(MESS) cat.c: more swyft WIP, still doesn't do very much. Found out it uses an ACIA (by looking at the rom code, 'init6850' function is kind of a giveaway), plus found where the control register for it lives. [Lord Nightmare]
This commit is contained in:
Jonathan Gevaryahu
parent
3bfdb75fca
commit
114aa729f7
@ -255,6 +255,7 @@ ToDo:
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#include "emu.h"
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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/nvram.h"
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class cat_state : public driver_device
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@ -272,6 +273,7 @@ public:
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m_maincpu(*this, "maincpu"),
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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_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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@ -288,7 +290,8 @@ public:
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required_device<cpu_device> m_maincpu;
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//optional_device<nvram_device> m_nvram;
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optional_device<duartn68681_device> m_duart; // should be required once plumbed to the swyft
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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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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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@ -712,10 +715,27 @@ static ADDRESS_MAP_START(cat_mem, AS_PROGRAM, 16, cat_state)
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AM_RANGE(0xC00000, 0xC00001) AM_READ(cat_2e80_r) AM_MIRROR(0x3FFFFE) // Open bus/vme?
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ADDRESS_MAP_END
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/* Swyft Memory map, based on watching the infoapp roms do their thing:
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68k address map:
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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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^ ^ ^ ^ ^
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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(0x00000000, 0x0000ffff) AM_ROM // 64 KB ROM
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AM_RANGE(0x00040000, 0x000bffff) AM_RAM AM_SHARE("p_videoram")
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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(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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//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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/* Input ports */
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@ -850,6 +870,7 @@ TIMER_CALLBACK_MEMBER(cat_state::counter_6ms_callback)
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// This is effectively also the KTOBF line 'clock' output to the d-latch before the duart
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// Hence, invert the d-latch on the duart's input ports.
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// is there some way to 'strobe' the duart to tell it that its input ports just changed?
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// with the devcb stuff, there definitely should be!
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m_duart_inp ^= 0x04;
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m_6ms_counter++;
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m_maincpu->set_input_line(M68K_IRQ_1, ASSERT_LINE); // hack until duart ints work; as of march 2013 they do not work correctly here (they fire at the wrong rate)
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@ -920,11 +941,14 @@ TIMER_CALLBACK_MEMBER(cat_state::swyft_reset)
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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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}
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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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//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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VIDEO_START_MEMBER(cat_state,swyft)
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@ -1016,6 +1040,17 @@ 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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@ -1046,7 +1081,7 @@ MACHINE_CONFIG_END
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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)
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MCFG_CPU_ADD("maincpu",M68000, XTAL_5MHz) // guess
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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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@ -1064,6 +1099,8 @@ static MACHINE_CONFIG_START( swyft, cat_state )
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MCFG_PALETTE_INIT_OVERRIDE(driver_device, black_and_white)
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MCFG_VIDEO_START_OVERRIDE(cat_state,swyft)
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MCFG_ACIA6850_ADD("acia6850", swyft_acia_config) // unknown clock
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MACHINE_CONFIG_END
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/* ROM definition */
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