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swim1: Disable read side effects to help debugging

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This commit is contained in:
AJR 2021-07-30 10:43:28 -04:00
parent 88589c115d
commit eac5b0f438
2 changed files with 21 additions and 10 deletions
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29
src/devices/machine/swim1.cpp
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@ -142,7 +142,19 @@ u8 swim1_device::read(offs_t offset)
if(m_ism_mode & 0x40)
return ism_read(offset);
else
return iwm_control(offset, 0x00);
{
if(!machine().side_effects_disabled())
iwm_control(offset, 0x00);
switch(m_iwm_control & 0xc0) {
case 0x00: return m_iwm_active ? m_iwm_data : 0xff;
case 0x40: return (m_iwm_status & 0x7f) | ((!m_floppy || m_floppy->wpt_r()) ? 0x80 : 0x00);
case 0x80: return m_iwm_whd;
case 0xc0: return 0xff;
}
abort();
}
}
void swim1_device::write(offs_t offset, u8 data)
@ -409,7 +421,7 @@ void swim1_device::flush_write(u64 when)
m_flux_write_count = 0;
}
u8 swim1_device::iwm_control(int offset, u8 data)
void swim1_device::iwm_control(int offset, u8 data)
{
iwm_sync();
@ -549,14 +561,13 @@ u8 swim1_device::iwm_control(int offset, u8 data)
else
logerror("iwm counter = %d\n", m_iwm_to_ism_counter);
switch(m_iwm_control & 0xc0) {
case 0x00: return m_iwm_active ? m_iwm_data : 0xff;
case 0x40: return (m_iwm_status & 0x7f) | ((!m_floppy || m_floppy->wpt_r()) ? 0x80 : 0x00);
case 0x80: return m_iwm_whd;
case 0xc0: if(offset & 1) { if(m_iwm_active) iwm_data_w(data); else iwm_mode_w(data); } return 0xff;
if((m_iwm_control & 0xc0) == 0xc0 && (offset & 1))
{
if(m_iwm_active)
iwm_data_w(data);
else
iwm_mode_w(data);
}
abort();
}
void swim1_device::ism_crc_clear()

2
src/devices/machine/swim1.h
View File

@ -121,7 +121,7 @@ private:
inline bool iwm_is_sync() const;
void iwm_mode_w(u8 data);
void iwm_data_w(u8 data);
u8 iwm_control(int offset, u8 data);
void iwm_control(int offset, u8 data);
void iwm_sync();
void ism_fifo_clear();