486-25C/33C Motherboard Settings and Configuration
ARNOS INSTRUMENTS & COMPUTER SYSTEMS COMPANY, INC.
486-25C/33C
Processor | 80486DX |
Processor Speed | 25/33MHz |
Chip Set | None |
Max. Onboard DRAM | 32MB |
Cache | 128KB |
BIOS | Phoenix |
Dimensions | 355mm x 304mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | X4 | Status display | X15 |
Turbo switch | X12 | Reset switch | X16 |
Speaker | X13 | Power LED & keylock | X17 |
Turbo LED | X14 |
|
|
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Factory configured - do not alter | S1 | pins 1 & 2 closed |
» | Battery installed < 5VDC | S2 | pins 1 & 2 closed |
| Battery installed > 5VDC | S2 | pins 2 & 3 closed |
» | CPU speed select switchable at keyboard | S3 | pins 2 & 3 closed |
| CPU speed select switchable at turbo switch | S3 | pins 1 & 2 closed |
» | Factory configured - do not alter | SW1/1 | N/A |
» | NPU disabled | SW1/2 | Off |
| NPU enabled | SW1/2 | On |
» | Factory configured - do not alter | SW1/3 | N/A |
» | Monitor type select monochrome | SW1/4 | Off |
| Monitor type select color | SW1/4 | On |
» | Factory configured - do not alter | TP1 | Off |
» | Factory configured - do not alter | TP2 | Off |
» | Factory configured - do not alter | TP3 | Off |
» | Factory configured - do not alter | TP4 | Off |
Note: The location of S1 is unidentified. | |||
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
4MB 2 | (4) 1M x 9 | NONE | NONE | NONE |
8MB 2 | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
12MB 2 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
16MB 1 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
16MB 2 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
16MB 1 | (4) 4M x 9 | NONE | NONE | NONE |
16MB 2 | (4) 4M x 9 | NONE | NONE | NONE |
20MB 2 | (4) 4M x 9 | (4) 1M x 9 | NONE | NONE |
24MB 2 | (4) 4M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
28MB 2 | (4) 4M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
32MB 1 | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
Note 1: These memory configurations do not utilize 256KB remapping. Note 2: These memory configurations utilize 256KB memory remapping. Due to remapping, system memory count on boot-up will reflect 256KB less than actual. | ||||
DRAM SWITCH CONFIGURATION | ||||
Size | SW1/5 | SW1/6 | SW1/ 7 | SW1/8 |
4MB 2 | On | On | On | On |
8MB 2 | On | On | On | Off |
12MB 2 | On | On | Off | On |
16MB 1 | On | On | Off | Off |
16MB 2 | On | Off | On | Off |
16MB 1 | On | Off | Off | On |
16MB 2 | On | Off | Off | Off |
20MB 2 | Off | On | On | On |
24MB 2 | Off | On | Off | On |
28MB 2 | Off | On | Off | Off |
32MB 1 | Off | Off | On | On |
Note 1: These memory configurations do not utilize 256KB remapping. Note 2: These memory configurations utilize 256KB-memory remapping. Due to remapping, system memory count on boot-up will reflect 256KB less than actual. | ||||
CACHE CONFIGURATION | ||
Size | Bank 0 | TAG |
128KB | (16) 8K x 8 | (2) 8K x 8 |
My Books
