VLB 486CT1 Motherboard Settings and Configuration
ACHME COMPUTER, INC.
VLB 486CT1
Processor | 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive |
Processor Speed | 20/25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External keyboard | J2 | Green PC | JP38 |
External battery | J4 | 32 Bit VESA slots | S1 & S2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select monochrome | JP17 | Open |
| Monitor type select color | JP17 | Closed |
» | Factory configured - do not alter | JP18 | Closed |
» | Factory configured - do not alter | JP22 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP23 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP26 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP37 | pins 1 & 2 closed |
PIN OUT CONFIGURATION | |
Function | J5 |
Keylock | pins 3 & 5 closed |
Power LED | pins 1 & 2 closed |
Speaker | pins 7 , 8 , 9 & 10 closed |
Turbo LED | pins 12 & 13 closed |
Turbo switch | pins 15, 16 & 17 closed |
Reset switch | pins 19 & 20 closed |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 3 |
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 |
5MB | (4) 1M x 9 | (4) 256K x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
17MB | (4) 256K x 9 | (4) 4M x 9 |
17MB | (4) 4M x 9 | (4) 256K x 9 |
20MB | (4) 1M x 9 | (4) 4M x 9 |
20MB | (4) 4M x 9 | (4) 1M 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 | NONE |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||
Size | JP1 | JP6 | JP7 |
64KB | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
128KB | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed |
256KB | pins 4 & 5 closed | pins 1 & 2 closed | pins 1 & 2 closed |
CPU TYPE CONFIGURATION | |||
Type | JP31 | JP32 | JP33 |
80486SX | pins 3 & 4 closed | Open | pins 2 & 3 , 4 & 5 closed |
80486SX (PQFP) | Open | Open | pins 1 & 2 closed |
80487SX | pins 2 & 3 , 4 & 5 closed | pins 1 & 2 closed | pins 2 & 3 , 4 & 5 closed |
80486DX | pins 2 & 3 , 4 & 5 closed | pins 2 & 3 closed | pins 2 & 3 , 4 & 5 closed |
80486DX (PQFP) | pins 1 & 2 closed | pins 4 & 5 closed | pins 1 & 2 closed |
ODP486SX | pins 2 & 3 , 4 & 5 closed | pins 1 & 2 closed | pins 2 & 3 , 4 & 5 closed |
80486DX2 | pins 2 & 3 , 4 & 5 closed | pins 2 & 3 closed | pins 2 & 3 , 4 & 5 closed |
Pentium Overdrive | pins 2 & 3 , 4 & 5 closed | pins 1 & 2 closed | pins 2 & 3 , 4 & 5 closed |
CPU SPEED CONFIGURATION | |||||
Speed | OSC. | JP8 | JP12 | JP13 | JP14 |
20MHz | 40MHz | pins 2 & 3 closed | Closed | Closed | Open |
25MHz | 25MHz | pins 2 & 3 closed | Open | Open | Closed |
33MHz | 33MHz | pins 1 & 2 closed | Closed | Open | Open |
50i MHz | 25MHz | pins 2 & 3 closed | Open | Open | Closed |
50MHz | 50MHz | pins 1 & 2 closed | Open | Closed | Open |
66i MHz | 33MHz | pins 1 & 2 closed | Closed | Open | Open |
VESA WAIT STATE/BUS SPEED CONFIGURATION | |||
CPU speed | Wait states | JP19 | JP20 |
<=33MHz | 0 wait states | Open | Open |
>33MHz | 1 wait state | Closed | Closed |
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