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iwm: Fix the random track trashing due to not clearing the write buffer correctly

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This commit is contained in:
Olivier Galibert 2021-02-09 15:56:59 +01:00
parent f6c18c498e
commit 5417235b1d
1 changed files with 7 additions and 3 deletions
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10
src/devices/machine/iwm.cpp
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@ -130,7 +130,7 @@ void iwm_device::write(offs_t offset, u8 data)
void iwm_device::flush_write()
{
if(m_floppy && m_last_sync > m_flux_write_start) {
if(m_floppy && m_flux_write_start && m_last_sync > m_flux_write_start) {
if(m_flux_write_count && m_flux_write[m_flux_write_count-1] == m_last_sync)
m_flux_write_count--;
attotime start = cycles_to_time(m_flux_write_start);
@ -139,9 +139,9 @@ void iwm_device::flush_write()
for(u32 i=0; i != m_flux_write_count; i++)
fluxes[i] = cycles_to_time(m_flux_write[i]);
m_floppy->write_flux(start, end, m_flux_write_count, m_flux_write_count ? &fluxes[0] : nullptr);
m_flux_write_start = m_last_sync;
}
m_flux_write_count = 0;
m_flux_write_start = m_last_sync;
}
u8 iwm_device::control(int offset, u8 data)
@ -176,6 +176,7 @@ u8 iwm_device::control(int offset, u8 data)
} else {
if(m_mode & 0x04) {
flush_write();
m_flux_write_start = 0;
m_active = MODE_IDLE;
m_status &= ~0x20;
m_whd &= ~0x40;
@ -191,8 +192,10 @@ u8 iwm_device::control(int offset, u8 data)
if(changed & 0xd0) {
if((m_control & 0xc0) == 0x00 && m_active) {
if(m_rw == MODE_WRITE)
if(m_rw == MODE_WRITE) {
flush_write();
m_flux_write_start = 0;
}
m_rw = MODE_READ;
m_rw_state = S_IDLE;
m_next_state_change = 0;
@ -213,6 +216,7 @@ u8 iwm_device::control(int offset, u8 data)
} else if(m_rw == MODE_WRITE) {
if(!(m_control & 0x80)) {
flush_write();
m_flux_write_start = 0;
m_rw = MODE_IDLE;
}
} else