FOREX COMPUTER CORPORATION
386/486 CACHE SYSTEM BOARD
|
Processor |
80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2 |
|
Processor Speed |
20/25/33/40/50(internal)/50/66(internal) MHz |
|
Chip Set |
Forex |
|
Max. onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit local bus slot |
|
NPU Options |
80387DX |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
JP2 |
Speaker |
JP10 |
|
Reset switch |
JP8 |
Turbo switch |
JP15 |
|
Power LED & keylock |
JP9 |
32-bit Local bus slot |
S1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Factory configured - do not alter |
JP5 |
N/A | |
|
CMOS memory normal operation |
JP6 |
Closed | |
|
CMOS memory clear |
JP6 |
Open | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(2) 8K x 8 |
|
CACHE JUMPER CONFIGURATION | |||||
|
Size |
JP8A |
JP8B |
JP8C |
JP8E |
JP8F |
|
64KB |
pins 2 & 3 |
pins 1 & 2 |
pins 1 & 2 |
pins 2 & 3 |
pins 1 & 2 |
|
128KB |
pins 1 & 2 |
pins 2 & 3 |
pins 2 & 3 |
pins 1 & 2 |
pins 1 & 2 |
|
256KB |
pins 2 & 3 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 2 & 3 |
|
Note:Pins designated should be in the closed position. | |||||
|
CPU SPEED CONFIGURATION | ||||
|
Speed |
JP7A |
JP7B |
JP7C |
JP7D |
|
20MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
25MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
33MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
40MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
50MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
66MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
80MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU TYPE CONFIGURATION | |||||
|
Type |
W1B |
W1A - W1G |
W2A |
W2A |
W2C - W2H |
|
80386DX |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
|
CX486DLC |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
|
80486 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
|
Notes:Pins designated should be in the closed position.
| |||||
|
80486 CPU TYPE CONFIGURATION | |||
|
Type |
JP12 |
JP13 |
JP30 |
|
80486SX |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80487SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
80486DX2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |