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ao486: Fix Win9x IDE protected-mode driver issue (ESDI_506.PDR) (#1121)

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humply
2026-03-15 18:19:50 +01:00
committed by GitHub
parent 36af7f7b46
commit ebd9b62692
1 changed files with 9 additions and 4 deletions
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13
support/x86/x86.cpp
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@@ -595,17 +595,22 @@ void x86_init()
0x00, //0x0E: REG E - POST status
0x00, //0x0F: REG F - shutdown status
(uint8_t)((get_fdd_bios_type(floppy_type[0])<<4) | get_fdd_bios_type(floppy_type[1])),
(uint8_t)((get_fdd_bios_type(floppy_type[0])<<4) | get_fdd_bios_type(floppy_type[1])), //0x10: floppy disk drive types; Bits 7-4 = fdd 0 type, Bits 3-0 = fdd 1 type
0x00, //0x11: configuration bits; not used
0x00, //0x12: hard disk types; 0-none, 1:E-type, F-type 16+ (unused)
// Note: The Windows 9x IDE driver ESDI_506.PDR checks CMOS location 0x12.
// For 32-bit protected-mode it is required that the hard disk drive type is non-zero.
// If CMOS location 0x12 is zero then MS-DOS compatibility mode will be used.
(uint8_t)(((strlen(config.img_name[2]) ? 0xF : 0x0) << 4) | (strlen(config.img_name[3]) ? 0xF : 0x0)), //0x12: hard disk drive types; 0-none, 1:E-type, F-type 16+ (unused)
// bits 7-4 = hard disk drive 0 type (primary master)
// bits 3-0 = hard disk drive 1 type (primary slave)
0x00, //0x13: advanced configuration bits; not used
0x4D, //0x14: equipment bits
0x80, //0x15: base memory in 1k LSB
0x02, //0x16: base memory in 1k MSB
0x00, //0x17: memory size above 1m in 1k LSB
(uint8_t)(memcfg ? 0x3C : 0xFC), //0x18: memory size above 1m in 1k MSB
0x00, //0x19: extended hd types 1/2; type 47d (unused)
0x00, //0x1A: extended hd types 2/2 (unused)
(uint8_t)(strlen(config.img_name[2]) ? 0x2F : 0x00), //0x19: extended hd 0 type; type 47d (unused)
(uint8_t)(strlen(config.img_name[3]) ? 0x2F : 0x00), //0x1A: extended hd 1 type; type 47d (unused)
//these hd parameters aren't used anymore
0x00, //0x1B: hd 0 configuration 1/9; cylinders low