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Fix memory size report for IBM PS/2 model 30-286

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WNT50
2026-02-11 15:30:27 +08:00
parent b636ed3b92
commit e064caac73
4 changed files with 36 additions and 1 deletions
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9
src/device/kbc_at.c
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@@ -2184,6 +2184,7 @@ read_p1(atkbc_t *dev)
-----------------
IBM PS/1: xxxxxxxx
IBM PS/2 MCA: xxxxx1xx
IBM PS/2 Model 30-286: xxxxx1xx
Intel AMI Pentium BIOS'es with AMI MegaKey KB-5 keyboard controller: x1x1xxxx
Acer: xxxxx0xx
Packard Bell PB450: xxxxx1xx
@@ -2198,6 +2199,7 @@ read_p1(atkbc_t *dev)
Acer: Pull down bit 6 if primary display is MDA.
Pull down bit 2 always (must be so to enable CMOS Setup).
IBM PS/1: Pull down bit 6 if current floppy drive is 3.5".
IBM PS/2 Model 30-286: Pull down bits 5 and 4 based on planar memory size.
Epson Action Tower 2600: Pull down bit 3 always (for Epson logo).
NCR: Pull down bit 5 always (power-on default speed = high).
Pull down bit 3 if there is no FPU.
@@ -2216,11 +2218,18 @@ read_p1(atkbc_t *dev)
Compaq: 0 = Compaq dual-scan display, 1 = non-Compaq display.
Bit 5: Mostly, manufacturing jumper: 0 = installed (infinite loop at POST), 1 = not installed;
NCR: power-on default speed: 0 = high, 1 = low;
IBM PS/2 Model 30-286: memory presence detect pin 1;
Compaq: System board DIP switch 5: 0 = ON, 1 = OFF.
Bit 4: (Which board?): RAM on motherboard: 0 = 512 kB, 1 = 256 kB;
NCR: RAM on motherboard: 0 = unsupported, 1 = 512 kB;
Intel AMI MegaKey KB-5: Must be 1;
IBM PS/1: Ignored;
IBM PS/2 Model 30-286: memory presence detect pin 2;
Bit 5, 4:
1, 1: 256Kx2 SIMM memory installed;
1, 0: 256Kx4 SIMM memory installed;
0, 1: 1Mx2 SIMM memory installed;
0, 0: 1Mx4 SIMM memory installed.
Compaq: 0 = Auto speed selected, 1 = High speed selected.
Bit 3: TriGem AMIKey: most significant bit of 2-bit OEM ID;
NCR: Coprocessor detect (1 = yes, 0 = no);