POSITIVE CORPORATION
PERSONAL COMPUTER SYTEMS SYSTEM BOARD
|
Processor |
80386SX/80486SX/80487SX (depends on CPU board installed) |
|
Processor Speed |
20/33MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
32MB |
|
Cache |
32/128KB (depends on CPU board installed) |
|
BIOS |
Unidentified |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
Parallel port, serial ports (2), VGA port, VGA feature connector, floppy drive interface, IDE interface, riser slot, CPU slot |
|
NPU Options |
80387SX |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
J2 |
External battery |
J17 |
|
Serial port 1 |
J3 |
Turbo LED |
J25 |
|
Serial port 2 |
J4 |
IDE interface LED |
J26 |
|
Parallel port |
J5 |
Auxiliary speaker |
J27 |
|
VGA feature connector |
J7 |
Reset switch |
S1 |
|
Floppy drive interface |
J11 |
Riser Card |
SL1 |
|
IDE interface |
J12 |
CPU slot |
SL2 |
|
Speaker |
J16 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
256KB - 640KB memory enabled |
J6 |
pins 1 & 2 closed |
|
256KB - 640KB memory disabled |
J6 |
pins 1 & 2 open | |
|
|
512KB - 640KB memory enabled |
J6 |
pins 3 & 4 closed |
|
512KB - 640KB memory disabled |
J6 |
pins 3 & 4 open | |
|
|
Security disabled |
J6 |
pins 5 & 6 closed |
|
Security enabled |
J6 |
pins 5 & 6 open | |
|
|
VGA mode select PS/2 |
J10 |
pins 5 & 6 closed |
|
VGA mode select AT |
J10 |
pins 5 & 6 open | |
|
|
Monitor timing select any monitor timing |
J10 |
pins 7 & 8 open |
|
Monitor timing select Multi Sync 1 timing |
J10 |
pins 7 & 8 closed | |
|
|
Factory configured - do not alter |
J13 |
N/A |
|
|
Factory configured - do not alter |
J28 |
N/A |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
512KB |
(2) 256K x 9 |
NONE |
NONE |
NONE |
|
1MB |
(2) 256K x 9 |
(2) 256K x 9 |
NONE |
NONE |
|
1.5MB |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 256K x 9 |
NONE |
|
2MB |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 256K x 9 |
|
2MB |
(2) 1M x 9 |
NONE |
NONE |
NONE |
|
2.5MB |
(2) 1M x 9 |
(2) 256K x 9 |
NONE |
NONE |
|
3MB |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 1M x 9 |
NONE |
|
3.5MB |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 1M x 9 |
(2) 256K x 9 |
|
4MB |
(2) 1M x 9 |
(2) 1M x 9 |
NONE |
NONE |
|
4.5MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 256K x 9 |
NONE |
|
5MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 256K x 9 |
(2) 256K x 9 |
|
6MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
NONE |
|
6.5MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 256K x 9 |
|
8MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
|
8MB |
(2) 4M x 9 |
NONE |
NONE |
NONE |
|
8.5MB |
(2) 4M x 9 |
(2) 256K x 9 |
NONE |
NONE |
|
9MB |
(2) 256K x 9 |
(2) 256K x 9 |
(2) 4M x 9 |
NONE |
|
10MB |
(2) 4M x 9 |
(2) 1M x 9 |
NONE |
NONE |
|
DRAM CONFIGURATION (CONT) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
12MB |
(2) 4M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
NONE |
|
14MB |
(2) 1M x 9 |
(2) 1M x 9 |
(2) 4M x 9 |
(2) 1M x 9 |
|
16MB |
(2) 4M x 9 |
(2) 4M x 9 |
NONE |
NONE |
|
16.5MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 256K x 9 |
NONE |
|
17MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 256K x 9 |
(2) 256K x 9 |
|
18MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 1M x 9 |
NONE |
|
20MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 1M x 9 |
(2) 1M x 9 |
|
24MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 4M x 9 |
NONE |
|
32MB |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 4M x 9 |
(2) 4M x 9 |
|
VRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
512KB |
512KB |
NONE |
|
1MB |
512KB |
512KB |
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
32KB |
(2) 8K x 8 |
(2) 8K x 8 |
|
128KB |
(2) 32K x 8 |
(2) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
JP1 |
|
32KB |
pins 1 & 2 closed |
|
128KB |
pins 3 & 4 closed |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Factory configured - do not alter |
JP1 |
N/A |
|
CPU TYPE CONFIGURATION | ||
|
Type |
JP1 |
JP2 |
|
80486SX-20 |
Open |
Closed |
|
80486SX-33 |
Closed |
Open |
|
80487SX-20 |
Closed |
Open |