ATC/UNITRON COMPUTERS & COMPUTER PARTS
U6931/G/E/C
Processor | CX486M6/80486SX/80487SX/CX486M7/80486DX/80486DX2/80486DX4/ P24D/P24T |
Processor Speed | 25/33/40/50(internal)/50/66(internal)/75(internal/100(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 128MB |
Cache | 64/128/256/512KB |
BIOS | Award |
Dimensions | 250mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3), green PC connector |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J2 | Speaker | JP38 |
Power LED & keylock | JP22 | Green PC connector | JP39 |
Turbo LED | JP34 | Reset switch | S1 |
Turbo switch | JP36 | 32-bit VESA local bus slots | SL1 - SL3 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
Monitor type select monochrome/EGA/VGA | JP1 | Open | |
Monitor type select color/CGA | JP1 | Closed | |
» | CMOS memory normal operation | JP2 | Pins 2 & 3 closed |
CMOS memory clear | JP2 | Pins 1 & 2 closed | |
» | Factory configured - do not alter | JP6 | Open |
» | Factory configured - do not alter | JP7 | Closed |
P24D write back enabled | JP19 | Pins 1 & 2 closed | |
P24D write through enabled | JP19 | Pins 2 & 3 closed | |
CPU type select any CPU except CX486M7 2x | JP22 | Open | |
CPU type select CX486M7 2x only | JP22 | Closed | |
» | Factory configured - do not alter | JP31 | Pins 2 & 3 closed |
» | Factory configured - do not alter | JP41 | N/A |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
2MB | (4) 256K x 9 | (1) 256K x 36 | None | None |
2MB | None | (1) 512K x 36 | None | None |
4MB | (4) 1M x 9 | None | None | None |
4MB | None | (1) 1M x 36 | None | None |
8MB | (4) 1M x 9 | (1) 1M x 36 | None | None |
8MB | None | (1) 2M x 36 | None | None |
16MB | (4) 4M x 9 | None | None | None |
16MB | None | (1) 4M x 36 | None | None |
16MB | (4) 1M x 9 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
16MB | None | (1) 2M x 36 | (1) 2M x 36 | None |
32MB | (4) 4M x 9 | (1) 4M x 36 | None | None |
32MB | None | (1) 4M x 36 | (1) 4M x 36 | None |
64MB | None | (1) 16M x 36 | None | None |
64MB | (4) 4M x 9 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
128MB | None | (1) 16M x 36 | (1) 16M x 36 | None |
DRAM JUMPER CONFIGURATION | |
Setting | JP5 |
30-pin SIMM as Bank 0 | Pins 2 & 3 closed |
72-pin SIMM as Bank 0 | Pins 1 & 2 closed |
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 (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
256KB (B) | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
512KB | (4) 128K x 8 | None | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||||
Size | JP8 | JP27 | JP28 | JP43 | JP44 |
64KB | 2 & 3 | Open | Open | Open | 1 & 2 |
128KB | 1 & 2 | Closed | Open | Open | 1 & 2 |
256KB (A) | 2 & 3 | Closed | Closed | Open | 2 & 3 |
256KB (B) | 2 & 3 | Closed | Closed | Open | 1 & 2 |
512KB | 1 & 2 | Closed | Closed | Closed | 1 & 2 |
Note: Pins designated should be in the closed position. |
CPU TYPE CONFIGURATION | |||||||
Type | JP9 | JP11 | JP12 | JP13 | JP15 | JP23 | JP32 |
CX486M6 | Closed | 2 & 3 | 2 & 3 | Open | Open | 2 & 3 | 1 & 2 |
80486SX | Open | 1 & 2 | Open | Open | Open | 2 & 3 | Open |
80487SX | Open | 1 & 2 | Open | 2 & 3 | Open | 1 & 2, 3 & 4 | Open |
CX486M7 | Closed | 2 & 3 | 2 & 3 | 1 & 2 | Open | 1 & 2, 3 & 4 | Open |
80486DX | Open | 1 & 2 | Open | 1 & 2 | Open | 1 & 2, 3 & 4 | Open |
80486DX2 | Open | 1 & 2 | Open | 1 & 2 | Open | 1 & 2, 3 & 4 | Open |
P24D | Open | 2 & 3 | Open | 1 & 2 | Closed | 1 & 2, 3 & 4 | 2 & 3 |
80486DX4 | N/A | 1 & 2 | 1 & 2 | 1 & 2 | N/A | 1 & 2, 3 & 4 | Open |
P24T | Open | 2 & 3 | Open | 1 & 2 | Closed | 1 & 2, 3 & 4 | 2 & 3 |
Note: Pins designated should be in the closed position. See also JP19 & JP22 in User Configurable. |
CPU TYPE CONFIGURATION | ||||
Type | JP10 | JP12 | JP20 | JP21 |
Non SL-enhanced | Open | Open | Open | Open |
SL-enhanced | Closed | Pins 1 & 2 closed | Closed | Closed |
CPU SPEED CONFIGURATION | |||
Speed | JP16 | JP17 | JP18 |
25MHz | Open | Open | Open |
33MHz | Open | Closed | Closed |
40MHz | Open | Closed | Open |
50iMHz | Open | Open | Open |
50MHz | Open | Open | Closed |
66iMHz | Open | Closed | Closed |
75iMHz | Open | Open | Open |
100iMHz | Open | Closed | Closed |
CPU SPEED CONFIGURATION (80486DX4 ONLY) | |
Speed | JP30 |
2x | Pins 1 & 2 closed |
2.5x | Pins 2 & 3 closed |
3x | Open |
CPU VOLTAGE CONFIGURATION | |
Voltage | JP29 |
3.45v | Pins 3 & 5, 4 & 6 closed |
5v | Pins 1 & 3, 2 & 4 closed |
VL BUS WAIT STATE CONFIGURATION | |
Wait states | JP35 |
0 wait states | Open |
1 wait state | Closed |
VL BUS SPEED CONFIGURATION | ||
CPU speed | JP33 | JP37 |
<= 33MHz | Pins 2 & 3 closed | Open |
> 33MHz | Pins 1 & 2 closed | Closed |