FOREX COMPUTER CORPORATION
FOREX 486 REV. VL2
|
Processor |
80486SX/80487SX/80486DX/80486DX2/Pentium Overdrive |
|
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 |
254mm x 220mm |
|
I/O Options |
32-bit VESA local bus slots (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
J5 |
Reset switch |
J9 |
|
Speaker |
J6 |
External battery |
JP1 |
|
Turbo switch |
J7 |
32-bit local bus slots |
SL1 & SL2 |
|
Power LED & keylock |
J8 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
CMOS memory normal operation |
JP6 |
Open |
|
CMOS memory clear |
JP6 |
Closed | |
|
|
Factory configured - do not alter |
JP9 |
Open |
|
|
CPU type select 80486 |
JP12 |
pins 1 & 2 closed |
|
CPU type select Pentium Overdrive |
JP12 |
pins 2 & 3 closed | |
|
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 |
(1) 16K/32K x 8 |
|
CACHE JUMPER CONFIGURATION | |||
|
Size |
JP8A |
JP8B |
JP8C |
|
64KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
128KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
256KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU TYPE CONFIGURATION | ||||
|
Type |
JP2 |
JP3 |
JP4 |
JP5 |
|
80486SX |
pins 2 & 3 closed |
Open |
Open |
pins 2 & 3 closed |
|
80486SX/DX PQFP |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80487SX |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80486DX/DX2 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
Pentium Overdrive |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
CPU SPEED CONFIGURATION | |||
|
Speed |
JP7A |
JP7B |
JP7C |
|
20MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
25MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
33MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
40MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
50iMHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
50MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
66iMHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
VESA WAIT STATE CONFIGURATION | |
|
Wait states |
JP10 |
|
0 wait states |
pins 1 & 2 closed |
|
1 wait state |
pins 2 & 3 closed |
|
BUS SPEED CONFIGURATION | |
|
CPU speed |
JP11 |
|
<= 33MHz |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |