486 EISA FULL SIZE Motherboard Settings and Configuration
INFOMATIC POWER SYSTEMS CORPORATION
486 EISA FULL SIZE
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/50/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 256MB |
Cache | 64/128/256/512KB |
BIOS | AMI |
Dimensions | 355mm x 304mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Speaker | J4 | Turbo LED | J7 |
Power LED & keylock | J5 | Reset switch | S9 |
Turbo switch | J6 |
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USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | External BCLK buffering 80486DX (33/50MHz) | JP1 | pins 1 & 2 closed |
| External BCLK buffering 80486SX/80487SX (20/25MHz) | JP1 | pins 2 & 3 closed |
» | Cache bank select single (128/512KB) | JP2 | pins 1 & 2 closed |
| Cache bank select double (64/256KB) | JP2 | pins 2 & 3 closed |
» | Snooping/Flush 20MHz CPU | JP8 | Closed |
| Snooping/Flush > 20MHz CPU | JP8 | Open |
» | Monitor type select color | JP9 | Closed |
| Monitor type select monochrome | JP9 | Open |
» | CPU clock mode select single frequency | JP12 | pins 1 & 2 closed |
| CPU clock mode select double frequency | JP12 | pins 2 & 3 closed |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
4MB | (4) 1M x 9 | NONE | NONE | NONE |
8MB | (4) 1M x 9 | (4) 1M x 9 | NONE | NONE |
12MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | NONE |
16MB | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE | NONE | NONE |
20MB | (4) 1M x 9 | (4) 4M x 9 | NONE | NONE |
24MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | NONE |
28MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 1M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 | NONE | NONE |
36MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
40MB | (4) 1M x 9 | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 |
48MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | NONE |
52MB | (4) 1M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
64MB | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 | (4) 4M x 9 |
64MB | (4) 16M x 9 | NONE | NONE | NONE |
128MB | (4) 16M x 9 | (4) 16M x 9 | NONE | NONE |
192MB | (4) 16M x 9 | (4) 16M x 9 | (4) 16M x 9 | NONE |
256MB | (4) 16M x 9 | (4) 16M x 9 | (4) 16M x 9 | (4) 16M x 9 |
CPU TYPE CONFIGURATION | ||
Type | JP10 | JP11 |
80486SX | pins 1 & 2 & 3 & 4 closed | pins 2 & 3 closed |
80487SX | pins 1 & 2 & 3 & 4 closed | pins 1 & 2 closed |
80486DX | pins 2 & 3 closed | Open |
EBC SPEED CONFIGURATION | ||
Speed | JP6 | JP7 |
20MHz | Open | Open |
25MHz | Open | Open |
33MHz | Open | Closed |
40MHz | Closed | Open |
50MHz | Closed | Closed |
CACHE CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
64KB | (4) 8K x 8 | (4) 8K x 8 |
128KB | (4) 32K x 8 | NONE |
256KB | (4) 32K x 8 | (4) 32K x 8 |
512KB | (4) 128K x 8 | NONE |
Note:In order to configure your cache for 512K, your board needs to have been specifically ordered. The difference will be that bank 1 will be made up of (4) 32 pin DIP sockets, instead of (4) 28 pin DIP sockets. | ||
CACHE TAG CHIP CONFIGURATION | |||||
Size | JP3 | JP4 | JP5 | U55 | U56 |
64KB | Open | Open | Open | (1) 8K x 8 | N/A |
128KB | Closed | Open | Open | (1) 8K x 8 | N/A |
256KB | Closed | Closed | Open | (1) 8K x 8 | (1) 8K x 8 |
512KB | Closed | Closed | Closed | (1) 32K x 8 | N/A |
CACHE DIRTY BIT CHIP CONFIGURATION | ||||
Size | JP16 | JP17 | JP18 | U72 & U54 |
64KB | open | open | open | (2) 16K x 1 or (2) 64K x 1 |
128KB | closed | open | open | (2) 16K x 1 or (2) 64K x 1 |
256KB | closed | closed | open | (2) 16K x 1 or (2) 64K x 1 |
512KB | closed | closed | closed | (2) 64K x 1 |
CLOCK CONFIGURATION | |||
Type | JP13 | JP14 | JP15 |
DS1287/1287A | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
DS1387/1488 | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
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