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wd_fdc: changes to get z80ne booting (also fix cgenie fm mode)

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- force interrupt is executed without delay
- on receiving a command, immediately set busy
- fix missing setting of ddm in fm mode
This commit is contained in:
Dirk Best 2015-05-28 17:23:31 +02:00
parent dde3e0c50d
commit ba665628d8
1 changed files with 21 additions and 7 deletions
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28
src/emu/machine/wd_fdc.c
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@ -233,7 +233,7 @@ void wd_fdc_t::seek_start(int state)
{
if (TRACE_COMMAND) logerror("%s: seek %d (track=%d)\n", tag(), data, track);
main_state = state;
status = (status & ~(S_CRC|S_RNF|S_SPIN)) | S_BUSY;
status &= ~(S_CRC|S_RNF|S_SPIN);
if(head_control) {
// TODO get value from HLT callback
if(command & 8)
@ -420,7 +420,7 @@ void wd_fdc_t::read_sector_start()
}
main_state = READ_SECTOR;
status = (status & ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM)) | S_BUSY;
status &= ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
@ -521,7 +521,7 @@ void wd_fdc_t::read_track_start()
}
main_state = READ_TRACK;
status = (status & ~(S_LOST|S_RNF)) | S_BUSY;
status &= ~(S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
@ -599,7 +599,7 @@ void wd_fdc_t::read_id_start()
}
main_state = READ_ID;
status = (status & ~(S_WP|S_DDM|S_LOST|S_RNF)) | S_BUSY;
status &= ~(S_WP|S_DDM|S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
@ -675,7 +675,7 @@ void wd_fdc_t::write_track_start()
}
main_state = WRITE_TRACK;
status = (status & ~(S_WP|S_DDM|S_LOST|S_RNF)) | S_BUSY;
status &= ~(S_WP|S_DDM|S_LOST|S_RNF);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
@ -785,7 +785,7 @@ void wd_fdc_t::write_sector_start()
}
main_state = WRITE_SECTOR;
status = (status & ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM)) | S_BUSY;
status &= ~(S_CRC|S_LOST|S_RNF|S_WP|S_DDM);
drop_drq();
if(side_control && floppy)
floppy->ss_w((command & 0x02) ? 1 : 0);
@ -1041,7 +1041,17 @@ void wd_fdc_t::cmd_w(UINT8 val)
cmd_buffer = val;
delay_cycles(t_cmd, dden ? delay_command_commit*2 : delay_command_commit);
if ((val & 0xf0) == 0xd0)
{
// force interrupt is executed instantly (?)
delay_cycles(t_cmd, 0);
}
else
{
// set busy, then set a timer to process the command
status |= S_BUSY;
delay_cycles(t_cmd, dden ? delay_command_commit*2 : delay_command_commit);
}
}
UINT8 wd_fdc_t::status_r()
@ -1649,6 +1659,10 @@ void wd_fdc_t::live_run(attotime limit)
cur_live.shift_reg == 0xf56b ? 0x9fc6 :
cur_live.shift_reg == 0xf56e ? 0xafa5 :
0xbf84;
if((cur_live.data_reg & 0xfe) == 0xf8)
status |= S_DDM;
cur_live.data_separator_phase = false;
cur_live.bit_counter = 0;
cur_live.state = READ_SECTOR_DATA;