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thmfc1: Use CMD2 rather than CMD1 to verify side in track header. Fixes errors on loading parts of 640K disks in to8, to8d & to9p.

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This commit is contained in:
AJR 2024-10-28 09:20:02 -04:00
parent f046326005
commit 864013166f
1 changed files with 5 additions and 3 deletions
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8
src/devices/machine/thmfc1.cpp
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@ -94,14 +94,14 @@ void thmfc1_device::cmd0_w(u8 data)
static const char *const mode[4] = { "reset", "wsect", "rhead", "rsect" };
m_cmd0 = data;
logerror("cmd0_w %02x, code=%s, ensyn=%d nomck=%d wgc=%d mode=%s\n", m_cmd1,
logerror("cmd0_w %02x, code=%s, ensyn=%d nomck=%d wgc=%d mode=%s\n", m_cmd0,
m_cmd0 & C0_FM ? "fm" : "mfm",
m_cmd0 & C0_ENSYN ? 1 : 0,
m_cmd0 & C0_NOMCK ? 1 : 0,
m_cmd0 & C0_WGC ? 1 : 0,
mode[m_cmd0 & 3]);
if(m_stat0 & S0_FREE)
if(m_stat0 & S0_FREE) {
switch(m_cmd0 & 3) {
case 0:
break;
@ -122,6 +122,7 @@ void thmfc1_device::cmd0_w(u8 data)
m_window_start = m_last_sync;
break;
}
}
}
void thmfc1_device::cmd1_w(u8 data)
@ -367,7 +368,8 @@ void thmfc1_device::sync()
valid = m_data_reg == m_trck;
break;
case 5:
valid = (m_data_reg & 1) == (m_cmd1 & C1_SIDE ? 1 : 0);
// C1_SIDE seems to be ignored here, at least for floppy disks
valid = (m_data_reg & 1) == (m_cmd2 & C2_SISELB ? 0 : 1);
break;
case 6:
valid = m_data_reg == m_sect;