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tweak s3 crtc reg36 (hal)

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3191
This commit is contained in:
Sebastian Strohhäcker 2008-08-04 17:48:36 +00:00
parent 01e8571ece
commit 3d40069e4a
1 changed files with 8 additions and 9 deletions
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17
src/hardware/vga_s3.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: vga_s3.cpp,v 1.14 2008-08-03 13:37:49 c2woody Exp $ */
/* $Id: vga_s3.cpp,v 1.15 2008-08-04 17:48:36 c2woody Exp $ */
#include "dosbox.h"
#include "inout.h"
@ -350,8 +350,7 @@ Bitu SVGA_S3_ReadCRTC( Bitu reg, Bitu iolen) {
case 0x36: /* CR36 Reset State Read 1 */
return vga.s3.reg_36;
case 0x37: /* Reset state read 2 */
return 0x2f;
// return 0x2b;
return 0x2b;
case 0x38: /* CR38 Register Lock 1 */
return vga.s3.reg_lock1;
case 0x39: /* CR39 Register Lock 2 */
@ -511,19 +510,19 @@ void SVGA_Setup_S3Trio(void) {
// Set CRTC 36 to specify amount of VRAM and PCI
if (vga.vmemsize < 1024*1024) {
vga.vmemsize = 512*1024;
vga.s3.reg_36 = 0xf9; // less than 1mb, video BIOS access enabled, VLB
vga.s3.reg_36 = 0xfa; // less than 1mb fast page mode
} else if (vga.vmemsize < 2048*1024) {
vga.vmemsize = 1024*1024;
vga.s3.reg_36 = 0xd9; // 1mb, video BIOS access enabled, VLB
vga.s3.reg_36 = 0xda; // 1mb fast page mode
} else if (vga.vmemsize < 3072*1024) {
vga.vmemsize = 2048*1024;
vga.s3.reg_36 = 0x99; // 2mb, video BIOS access enabled, VLB
vga.s3.reg_36 = 0x9a; // 2mb fast page mode
} else if (vga.vmemsize < 4096*1024) {
vga.vmemsize = 3072*1024;
vga.s3.reg_36 = 0x59; // 3mb, video BIOS access enabled, VLB
vga.s3.reg_36 = 0x5a; // 3mb fast page mode
} else { // Trio64 supported only up to 4M
vga.vmemsize = 4096*1024;
vga.s3.reg_36 = 0x19; // 4mb, video BIOS access enabled, VLB
vga.s3.reg_36 = 0x1a; // 4mb fast page mode
}
// S3 ROM signature
@ -536,5 +535,5 @@ void SVGA_Setup_S3Trio(void) {
phys_writeb(rom_base+0x0044,'C');
phys_writeb(rom_base+0x0045,'7');
phys_writeb(rom_base+0x0046,'6');
phys_writeb(rom_base+0x0047,'5');
phys_writeb(rom_base+0x0047,'4');
}