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wozfdc: Reduce the flux inversion pulse duration to the minimum [Peter Ferrie, O. Galibert]

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This commit is contained in:
Olivier Galibert 2015-02-21 18:21:23 +01:00
parent 5bba5a93a4
commit 5099c74845
1 changed files with 2 additions and 4 deletions
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6
src/emu/machine/wozfdc.c
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@ -431,7 +431,6 @@ void wozfdc_device::lss_predict(attotime limit)
bool write_line_active = cur_lss.write_line_active; bool write_line_active = cur_lss.write_line_active;
attotime next_flux = floppy ? floppy->get_next_transition(cur_lss.tm - attotime::from_usec(1)) : attotime::never; attotime next_flux = floppy ? floppy->get_next_transition(cur_lss.tm - attotime::from_usec(1)) : attotime::never;
attotime next_flux_down = next_flux != attotime::never ? next_flux + attotime::from_usec(1) : attotime::never;
if(limit == attotime::never) if(limit == attotime::never)
limit = machine().time() + attotime::from_usec(50); limit = machine().time() + attotime::from_usec(50);
@ -439,7 +438,7 @@ void wozfdc_device::lss_predict(attotime limit)
UINT64 cycles = cur_lss.cycles; UINT64 cycles = cur_lss.cycles;
UINT64 cycles_limit = time_to_cycles(limit); UINT64 cycles_limit = time_to_cycles(limit);
UINT64 cycles_next_flux = next_flux != attotime::never ? time_to_cycles(next_flux) : UINT64(-1); UINT64 cycles_next_flux = next_flux != attotime::never ? time_to_cycles(next_flux) : UINT64(-1);
UINT64 cycles_next_flux_down = next_flux_down != attotime::never ? time_to_cycles(next_flux_down) : UINT64(-1); UINT64 cycles_next_flux_down = cycles_next_flux != UINT64(-1) ? cycles_next_flux+1 : UINT64(-1);
UINT8 address = cur_lss.address; UINT8 address = cur_lss.address;
UINT8 data_reg = cur_lss.data_reg; UINT8 data_reg = cur_lss.data_reg;
@ -499,9 +498,8 @@ void wozfdc_device::lss_predict(attotime limit)
else if(cycles == cycles_next_flux_down) { else if(cycles == cycles_next_flux_down) {
address |= 0x10; address |= 0x10;
next_flux = floppy ? floppy->get_next_transition(cycles_to_time(cycles)) : attotime::never; next_flux = floppy ? floppy->get_next_transition(cycles_to_time(cycles)) : attotime::never;
next_flux_down = next_flux != attotime::never ? next_flux + attotime::from_usec(1) : attotime::never;
cycles_next_flux = next_flux != attotime::never ? time_to_cycles(next_flux) : UINT64(-1); cycles_next_flux = next_flux != attotime::never ? time_to_cycles(next_flux) : UINT64(-1);
cycles_next_flux_down = next_flux_down != attotime::never ? time_to_cycles(next_flux_down) : UINT64(-1); cycles_next_flux_down = cycles_next_flux != UINT64(-1) ? cycles_next_flux+1 : UINT64(-1);
} }
} }