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Commit patch 1311364 from vasyl. Improves chain4 memory model when in vga mode

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2350
This commit is contained in:
Peter Veenstra 2005-10-21 11:20:08 +00:00
parent 593e664e8b
commit 7f07885811
5 changed files with 59 additions and 3 deletions
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5
src/ints/int10_modes.cpp
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@ -439,6 +439,8 @@ bool INT10_SetVideoMode(Bitu mode) {
IO_Write(0x3c4,i);
IO_Write(0x3c5,seq_data[i]);
}
vga.config.compatible_chain4 = true; // this may be changed by SVGA chipset emulation
/* Program CRTC */
/* First disable write protection */
IO_Write(crtc_base,0x11);
@ -822,7 +824,8 @@ dac_text16:
IO_Write(crtc_base+1,(Bit8u)(S3_LFB_BASE >> 16));
/* Setup some remaining S3 registers */
IO_Write(crtc_base,0x31);IO_Write(crtc_base+1,0x9); //Enable banked memory and 256k+ access
// IO_Write(crtc_base,0x31);IO_Write(crtc_base+1,0x9); //Enable banked memory and 256k+ access
IO_Write(crtc_base,0x31);IO_Write(crtc_base+1,CurMode->mode<=0x13?0x1:0x9); //Enable banked memory and 256k+ access for SVGA modes only
IO_Write(crtc_base,0x58);IO_Write(crtc_base+1,0x3); //Enable 8 mb of linear addressing
IO_Write(crtc_base,0x38);IO_Write(crtc_base+1,0x48); //Register lock 1
IO_Write(crtc_base,0x39);IO_Write(crtc_base+1,0xa5); //Register lock 2