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flopimg: Fix gcr checksum

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This commit is contained in:
Olivier Galibert 2021-01-22 16:22:42 +01:00
parent 9365219ff3
commit 2cb2bdc1a0
2 changed files with 8 additions and 8 deletions
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2
src/devices/imagedev/floppy.cpp
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@ -2520,7 +2520,7 @@ void mac_floppy_device::seek_phase_w(int phases)
case 0x7: // Start eject
logerror("cmd start eject\n");
call_unload();
unload();
break;
case 0x9: // MFM mode on

14
src/lib/formats/flopimg.cpp
View File

@ -2912,12 +2912,14 @@ void floppy_image_format_t::build_mac_track_gcr(int track, int head, floppy_imag
uint16_t sumb = cb + vb + (suma >> 8);
cb = sumb;
vb = vb ^ ca;
cc = cc + vc + (sumb >> 8);
if(i != 174)
cc = cc + vc + (sumb >> 8);
vc = vc ^ cb;
uint32_t nb = i != 174 ? 32 : 24;
raw_w(buffer, nb, gcr6_encode(va, vb, vc) >> (32-nb));
}
raw_w(buffer, 32, gcr6_encode(ca, cb, cc));
raw_w(buffer, 32, 0xdeaaffff);
}
@ -3026,15 +3028,13 @@ std::vector<std::vector<uint8_t>> floppy_image_format_t::extract_sectors_from_tr
cb = sumb;
vc = vc ^ cb;
if(i == 174)
vc = 0;
cc = cc + vc + (sumb >> 8);
sdata[3*i] = va;
sdata[3*i+1] = vb;
if(i != 174)
if(i != 174) {
cc = cc + vc + (sumb >> 8);
sdata[3*i+2] = vc;
}
}
for(auto &e : h) {
e = nib[pos];