IBM CORPORATION
PERSONAL SYSTEM/2 HMM
|
Processor |
80486SX/80486DX/80486DX2/80486DX4/P24T |
|
Processor Speed |
25/33/50(internal/66(internal)/75(internal)/100(internal)/MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
Unidentified |
|
Maximum Video Memory |
None |
|
Cache |
128/256KB |
|
BIOS |
Unidentified |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
32-bit PCI slots (3), floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
PS/2 mouse port |
J2 |
IDE interface 1 |
J21 |
|
Speaker |
J5 |
IDE interface 2 |
J22 |
|
Parallel port |
J8 |
32-bit PCI slots |
PC1 PC3 |
|
Floppy drive interface |
J9 |
Power LED |
W12 |
|
Serial port 2 |
J10 |
IDE interface LED (PCI) |
W39 |
|
Serial port 1 |
J11 |
IDE interface LED (ISA) |
W46 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Secondary cache write select write back |
W1 |
Pins 2 & 3 closed |
|
Secondary cache write select write through |
W1 |
Pins 1 & 2 closed | |
|
|
Internal cache write select write through |
W4 |
Open |
|
Internal cache write select write back |
W4 |
Closed | |
|
|
Flash BIOS normal operation |
W6 |
Pins 2 & 3 closed |
|
Flash BIOS recovery mode |
W6 |
Pins 1 & 2 closed | |
|
|
Factory configured - do not alter |
W8 |
Closed |
|
|
PS/2 mouse installed |
W10 |
Closed |
|
PS/2 mouse not installed |
W10 |
Open | |
|
Parity generation select DPU |
W17 |
Pins 1 & 2 closed | |
|
Parity generation select CPU |
W17 |
Pins 2 & 3 closed | |
|
|
DPU does not force parity |
W18 |
Pins 2 & 3 closed |
|
DPU forces parity |
W18 |
Pins 1 & 2 closed | |
|
|
Factory configured - do not alter |
W19 |
Closed |
|
|
Cache installed |
W21 |
Open |
|
Cache not installed |
W21 |
Closed | |
|
DRAM CONFIGURATION |
|
Note: The maximum size and configuration is unidentified. |
|
CACHE CONFIGURATION |
|
Note: The location and configuration is unidentified. |
|
CACHE JUMPER SELECTION | |||
|
Size |
W5 |
W22 |
W23 |
|
128KB |
Open |
Closed |
Open |
|
256KB |
Closed |
Open |
Closed |
|
CACHE TAG SELECTION | |||
|
Size |
W24 |
W26 | |
|
7-bit |
Open |
Closed | |
|
8-bit |
Closed |
Closed | |
|
9-bit |
Closed |
Open | |
|
CPU SPEED SELECTION | ||
|
Speed |
W16 |
W20 |
|
25MHz |
Open |
Closed |
|
33MHz |
Closed |
Open |
|
50iMHz |
Open |
Closed |
|
66iMHz |
Closed |
Open |
|
75iMHz |
Open |
Closed |
|
100iMHz |
Closed |
Open |
|
CPU TYPE SELECTION | ||
|
Type |
W2 |
W3 |
|
80486SX |
Pins 2 & 3 closed |
Closed |
|
80486DX |
Pins 1 & 2, 3 & 4 closed |
Closed |
|
80486DX2 |
Pins 1 & 2, 3 & 4 closed |
Closed |
|
80486DX4 |
Pins 1 & 2, 3 & 4 closed |
Closed |
|
P24T |
Pins 1 & 2, 3 & 4 closed |
Open |
|
CPU MULTIPLIER SELECTION | |
|
Multiplier |
W33 |
|
1x |
Pins 1 & 2 closed |
|
2x |
Pins 2 & 3 closed |
|
3x |
Open |
|
DMA CHANNEL SELECTION | ||
|
Channel |
W43 | |
|
ISA IDE used P10 transfer |
Open | |
|
6 |
Pins 1 & 2 closed | |
|
7 |
Pins 2 & 3 closed | |
|
ISA IDE IRQ SELECTION | |
|
IRQ |
W42 |
|
IRQ14 |
Pins 1 & 2 closed |
|
IRQ15 |
Pins 2 & 3 closed |
|
PCI IDE IRQ SELECTION | |||
|
IRQ |
W35 |
W38 | |
|
IRQ14 |
Closed |
Open | |
|
IRQ15 |
Open |
Closed | |
|
PCI INTERRUPT SELECTION | |
|
Setting |
W37 |
|
INTR_A enabled |
Closed |
|
INTR_A disabled |
Open |
|
PCI COMPLIANT IRQ SELECTION | |
|
IRQ |
J101 |
|
IRQ1 |
Pin 2 |
|
IRQ3 |
Pin 3 |
|
IRQ4 |
Pin 4 |
|
IRQ5 |
Pin 5 |
|
IRQ6 |
Pin 6 |
|
IRQ7 |
Pin 7 |
|
IRQ8 |
Pin 8 |
|
IRQ9 |
Pin 9 |
|
IRQ10 |
Pin 10 |
|
IRQ11 |
Pin 11 |
|
IRQ12 |
Pin 12 |
|
IRQ14 |
Pin 13 |
|
IRQ15 |
Pin 14 |