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Fixed "extended address wrap" mode: setting "plane shift" value not correct in

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"chain4" mode (fixes DOS Doom in Win95).
This commit is contained in:
Volker Ruppert 2021-06-18 23:00:40 +00:00
parent e1265b7536
commit 56fb9cacc2
1 changed files with 3 additions and 1 deletions
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4
bochs/iodev/display/svga_cirrus.cc
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@ -1635,7 +1635,9 @@ void bx_svga_cirrus_c::svga_write_crtc(Bit32u address, unsigned index, Bit8u val
if (update_pitch) {
if ((BX_CIRRUS_THIS crtc.reg[0x1b] & 0x02) != 0) {
BX_CIRRUS_THIS s.plane_shift = 19;
if (!BX_CIRRUS_THIS s.sequencer.chain_four) {
BX_CIRRUS_THIS s.plane_shift = 19;
}
BX_CIRRUS_THIS s.ext_offset = BX_CIRRUS_THIS bank_base[0];
} else {
BX_CIRRUS_THIS s.plane_shift = 16;