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(MESS) itt3030: additional FDC hookup, now tries and fails to boot. [R. Belmont]
This commit is contained in:
R. Belmont
parent
68cc07718e
commit
4d8a28072c
@ -198,7 +198,6 @@ Beeper Circuit, all ICs shown:
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#include "sound/beep.h"
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#include "cpu/mcs48/mcs48.h" //Keyboard MCU ... talks to the 8278 on the keyboard circuit
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#define MAIN_CLOCK XTAL_4.194MHz
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class itt3030_state : public driver_device
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@ -265,7 +264,8 @@ protected:
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public:
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DECLARE_READ8_MEMBER(vsync_r);
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DECLARE_READ8_MEMBER(unk2_r);
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DECLARE_READ8_MEMBER(i8078_r);
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DECLARE_WRITE8_MEMBER(i8078_w);
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DECLARE_WRITE8_MEMBER( beep_w );
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DECLARE_WRITE8_MEMBER(bank_w);
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DECLARE_READ8_MEMBER(bankl_r);
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@ -275,13 +275,24 @@ public:
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DECLARE_READ8_MEMBER(kbd_fifo_r);
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DECLARE_READ8_MEMBER(kbd_matrix_r);
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DECLARE_WRITE8_MEMBER(kbd_matrix_w);
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DECLARE_READ8_MEMBER(fdc_stat_r);
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DECLARE_WRITE8_MEMBER(fdc_cmd_w);
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DECLARE_FLOPPY_FORMATS(itt3030_floppy_formats);
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DECLARE_WRITE_LINE_MEMBER(fdcirq_w);
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DECLARE_WRITE_LINE_MEMBER(fdcdrq_w);
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DECLARE_WRITE_LINE_MEMBER(fdchld_w);
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private:
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UINT8 m_unk;
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UINT8 m_bank;
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UINT8 m_kbdrow, m_kbdcol, m_kbdclk, m_kbdread;
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required_device<gfxdecode_device> m_gfxdecode;
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required_device<palette_device> m_palette;
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floppy_image_device *m_curfloppy;
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bool m_fdc_irq, m_fdc_drq, m_fdc_hld;
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floppy_connector *m_con1, *m_con2, *m_con3;
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bool m_keyskip;
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};
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void itt3030_state::video_start()
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@ -306,9 +317,42 @@ READ8_MEMBER(itt3030_state::vsync_r)
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return ret;
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}
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READ8_MEMBER(itt3030_state::unk2_r)
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// TODO: make this a correct device once we figure out how everything goes together in this system
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READ8_MEMBER(itt3030_state::i8078_r)
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{
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return 0x40;
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if (offset)
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{
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// printf("Read 8078 status\n");
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if (!m_keyskip)
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{
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return 0x10;
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}
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}
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else
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{
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// printf("Read 8078 data\n");
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if (!m_keyskip)
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{
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m_keyskip = true; // don't keep reporting the 'b' key, just the once to trick the boot ROM
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return 0x0c;
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}
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}
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return 0;
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}
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WRITE8_MEMBER(itt3030_state::i8078_w)
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{
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#if 0
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if (offset)
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{
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printf("%02x to 8078 command\n", data);
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}
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else
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{
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printf("%02x to 8078 data\n", data);
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}
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#endif
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}
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WRITE8_MEMBER( itt3030_state::beep_w )
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@ -369,6 +413,95 @@ UINT32 itt3030_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap
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return 0;
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}
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WRITE_LINE_MEMBER(itt3030_state::fdcirq_w)
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{
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m_fdc_irq = state;
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}
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WRITE_LINE_MEMBER(itt3030_state::fdcdrq_w)
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{
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m_fdc_drq = state;
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}
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WRITE_LINE_MEMBER(itt3030_state::fdchld_w)
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{
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m_fdc_hld = state;
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}
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/*
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7 Data Request (IRQ - inverted 1791-Signal)
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6 Interrupt Request (INTRQ - 1791-Signal)
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5 Head Load (HLD - inverted 1791-Signal)
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4 Ready 3 (Drive 3 ready)
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3 Ready 2 (Drive 2 ready)
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2 Ready l (Drive 1 ready)
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1 Write protect (the disk in the selected drive is write protected)
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0 HLT (Halt signal during head load and track change)
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*/
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READ8_MEMBER(itt3030_state::fdc_stat_r)
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{
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UINT8 res = 0;
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floppy_image_device *floppy1 = m_con1 ? m_con1->get_device() : 0;
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floppy_image_device *floppy2 = m_con2 ? m_con2->get_device() : 0;
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floppy_image_device *floppy3 = m_con3 ? m_con3->get_device() : 0;
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res = m_fdc_drq ? 0x00 : 0x80;
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res = m_fdc_irq ? 0x40 : 0x00;
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res = m_fdc_hld ? 0x00 : 0x20;
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if (floppy3) res |= floppy3->ready_r() ? 0x10 : 0;
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if (floppy2) res |= floppy2->ready_r() ? 0x08 : 0;
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if (floppy1) res |= floppy1->ready_r() ? 0x04 : 0;
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if (m_curfloppy) res |= m_curfloppy->wpt_r() ? 0x02 : 0;
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return res;
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}
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/*
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7 SEL1 - Select drive 1
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6 SEL2 - Select drive 2
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5 SEL3 - Select drive 3
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4 MOTOR - Motor on
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3 DOOR - Drive door lock drives 1 + 2 (not possible with all drives)
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2 SIDESEL - Select disk side
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1 KOMP - write comp on/off
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0 RG J - Change separator stage to read
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*/
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WRITE8_MEMBER(itt3030_state::fdc_cmd_w)
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{
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floppy_image_device *floppy = NULL;
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logerror("%02x to fdc_cmd_w: motor %d side %d\n", data, (data & 0x10)>>4, (data & 4)>>2);
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// select drive
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if (data & 0x80)
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{
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floppy = m_con1 ? m_con1->get_device() : 0;
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}
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else if (data & 0x40)
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{
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floppy = m_con2 ? m_con2->get_device() : 0;
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}
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else if (data & 0x20)
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{
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floppy = m_con3 ? m_con3->get_device() : 0;
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}
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// selecting a new drive?
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if (floppy != m_curfloppy)
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{
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m_fdc->set_floppy(floppy);
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m_curfloppy = floppy;
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}
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if (floppy != NULL)
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{
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// side select
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floppy->ss_w((data & 4) ? 1 : 0);
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// motor control (active low)
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floppy->mon_w((data & 0x10) ? 0 : 1);
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}
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}
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// The lower 48K is switchable among the first 48K of each of 8 64K banks numbered 0-7 or "bank 8" which is the internal ROM and VRAM
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// The upper 16K is always the top 16K of the selected bank 0-7, which allows bank/bank copies and such
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@ -390,11 +523,12 @@ ADDRESS_MAP_END
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static ADDRESS_MAP_START( itt3030_io, AS_IO, 8, itt3030_state )
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ADDRESS_MAP_GLOBAL_MASK(0xff)
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AM_RANGE(0x20, 0x26) AM_DEVREADWRITE("crt5027", crt5027_device, read, write)
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AM_RANGE(0x31, 0x31) AM_READ(unk2_r)
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AM_RANGE(0x30, 0x31) AM_READWRITE(i8078_r, i8078_w)
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AM_RANGE(0x32, 0x32) AM_WRITE(beep_w)
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AM_RANGE(0x35, 0x35) AM_READ(vsync_r)
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AM_RANGE(0x40, 0x40) AM_READ(kbd_fifo_r)
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AM_RANGE(0x50, 0x55) AM_DEVREADWRITE("fdc", fd1791_t, read, write)
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AM_RANGE(0x50, 0x53) AM_DEVREADWRITE("fdc", fd1791_t, read, write)
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AM_RANGE(0x54, 0x54) AM_READWRITE(fdc_stat_r, fdc_cmd_w)
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AM_RANGE(0xf6, 0xf6) AM_WRITE(bank_w)
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ADDRESS_MAP_END
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@ -577,6 +711,14 @@ void itt3030_state::machine_reset()
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m_kbdread = 1;
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m_kbdrow = m_kbdcol = 0;
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m_kbdclk = 1;
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m_fdc_irq = m_fdc_drq = m_fdc_hld = 0;
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m_curfloppy = NULL;
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m_keyskip = false;
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// look up floppies in advance
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m_con1 = machine().device<floppy_connector>("fdc:0");
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m_con2 = machine().device<floppy_connector>("fdc:1");
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m_con3 = machine().device<floppy_connector>("fdc:2");
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}
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FLOPPY_FORMATS_MEMBER( itt3030_state::itt3030_floppy_formats )
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@ -619,9 +761,12 @@ static MACHINE_CONFIG_START( itt3030, itt3030_state )
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MCFG_TMS9927_CHAR_WIDTH(16)
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MCFG_FD1791x_ADD("fdc", XTAL_20MHz / 20)
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MCFG_WD_FDC_FORCE_READY
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MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(itt3030_state, fdcirq_w))
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MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(itt3030_state, fdcdrq_w))
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MCFG_WD_FDC_HLD_CALLBACK(WRITELINE(itt3030_state, fdchld_w))
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MCFG_FLOPPY_DRIVE_ADD("fdc:0", itt3030_floppies, "525dd", itt3030_state::itt3030_floppy_formats)
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MCFG_FLOPPY_DRIVE_ADD("fdc:1", itt3030_floppies, "525dd", itt3030_state::itt3030_floppy_formats)
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MCFG_FLOPPY_DRIVE_ADD("fdc:2", itt3030_floppies, "525dd", itt3030_state::itt3030_floppy_formats)
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MCFG_GFXDECODE_ADD("gfxdecode", "palette", itt3030)
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