UNITRON COMPUTER, INC.
3/486 MAINBOARD
Processor | 80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2 |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | UMC |
Max. Onboard DRAM | 32MB |
SRAM Cache | 32/64/128/256KB |
BIOS | AMI/Phoenix |
Dimensions | 230mm x 218mm |
I/O Options | 32-bit proprietary local bus slot, 32-bit VESA local bus slot |
NPU Options | 80387DX/CX487DLC |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Speaker | J29 |
Turbo LED | J25 | Power LED & keylock | J30 |
Reset switch | J26 | 32-bit local bus slot | S1 |
Turbo switch | J28 | 32-bit VESA local bus slot | S2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | J6 | pins 2 & 3 closed |
Monitor type select monochrome | J6 | pins 1 & 2 closed | |
» | Parity enabled | J9 | pins 2 & 3 closed |
Parity disabled | J9 | pins 1 & 2 closed | |
» | Factory configured - do not alter | J21 | Open |
» | Factory configured - do not alter | J31 | 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) 4M x 9 | (4) 1M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
SRAM CONFIGURATION | |||
Size | Cache | Location | TAG |
32KB | (8) 8K x 8 | Bank 0 | (1) 8K x8 |
64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
128KB | (4) 32K x 8 | Bank 0 | (1) 8K x 8 |
256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
SRAM JUMPER CONFIGURATION | |||||||
Size | J7 | J8 | J11 | J12 | J13 & J19 | J17 | J18 |
32KB | Open | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
64KB | Open | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 2 & 3 |
128KB | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
256KB | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
Note: Pins designated should in the closed position. |
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VESA MODE CONFIGURATION | |||
Mode | J22 | J23 | J24 |
Master | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
Slave | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
Note: VESA master mode can only be enabled when IC PAL 16R4 is installed. |
CPU TYPE CONFIGURATION | |||||
CPU Type | J10 | J14 | J15 | J16 | J20 |
80386DX with NPU | pins 1 & 2 | N/A | pins 1 & 2 | N/A | N/A |
80386DX w/o NPU | pins 1 & 2 | N/A | pins 2 & 3 | N/A | N/A |
80486SX PQFP | pins 2 & 3 | Open | pins 2 & 3 | pins 2 & 3 | Open |
80486SX PGA | pins 2 & 3 | Open | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
80486SX | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
80486SX + 487SX OD | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, 3 & 4 | pins 2 & 3 |
80486SX + 486DX PGA | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2, 3 & 4 | pins 2 & 3 |
80486DX | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2, 3 & 4 | pins 2 & 3 |
80486DX2 | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 | pins 1 & 2, 3 & 4 | pins 2 & 3 |
CPU SPEED CONFIGURATION | ||||
ICS2494 ( CPU Clock Generator) | ||||
Speed | J2 | J3 | J4 | J5 |
25MHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
33MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
40MHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
50iMHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
50MHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
66iMHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
CPU SPEED CONFIGURATION | ||||
IMISC425 ( CPU Clock Generator) | ||||
Speed | J2 | J3 | J4 | J5 |
25MHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
33MHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
40MHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
50iMHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
50MHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
66iMHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |