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MZ-2500: Fixed floppy drive reverse behaviour, allows Laydock to get farther [Takeda Toshiya, Angelo Salese]

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This commit is contained in:
Scott Stone 2014-12-19 12:02:36 -05:00
parent bb652cbfec
commit 8644c3686b
1 changed files with 8 additions and 7 deletions
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15
src/mess/drivers/mz2500.c
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@ -1183,13 +1183,14 @@ WRITE8_MEMBER(mz2500_state::mz2500_irq_data_w)
WRITE8_MEMBER(mz2500_state::mz2500_fdc_w)
{
mb8877_device *fdc = machine().device<mb8877_device>("mb8877a");
UINT8 drivenum;
switch(offset+0xdc)
{
case 0xdc:
fdc->set_drive(data & 3);
floppy_get_device(machine(), data & 3)->floppy_mon_w((data & 0x80) ? CLEAR_LINE : ASSERT_LINE);
floppy_get_device(machine(), data & 3)->floppy_drive_set_ready_state(1,0);
drivenum = (data & 3) ^ m_fdc_reverse;
fdc->set_drive(drivenum);
floppy_get_device(machine(), drivenum)->floppy_mon_w((data & 0x80) ? CLEAR_LINE : ASSERT_LINE);
floppy_get_device(machine(), drivenum)->floppy_drive_set_ready_state(1,0);
break;
case 0xdd:
fdc->set_side((data & 1));
@ -1267,13 +1268,13 @@ WRITE8_MEMBER(mz2500_state::palette4096_io_w)
READ8_MEMBER(mz2500_state::mz2500_wd17xx_r)
{
mb8877_device *fdc = machine().device<mb8877_device>("mb8877a");
return fdc->read(space, offset) ^ m_fdc_reverse;
return fdc->read(space, offset) ^ 0xff;
}
WRITE8_MEMBER(mz2500_state::mz2500_wd17xx_w)
{
mb8877_device *fdc = machine().device<mb8877_device>("mb8877a");
fdc->write(space, offset, data ^ m_fdc_reverse);
fdc->write(space, offset, data ^ 0xff);
}
READ8_MEMBER(mz2500_state::mz2500_bplane_latch_r)
@ -1982,7 +1983,7 @@ WRITE8_MEMBER(mz2500_state::opn_porta_w)
---- --x- floppy reverse bit (controls wd17xx bits in command registers)
*/
m_fdc_reverse = (data & 2) ? 0x00 : 0xff;
m_fdc_reverse = data & 2;
m_pal_select = (data & 4) ? 1 : 0;
m_ym_porta = data;