486E Motherboard Settings and Configuration
NORTHGATE COMPUTER SYSTEMS, INC.
486E
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/50/50(internal)/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 128MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
IDE interface LED | J4 & J5 pins 10 & 20 | Turbo LED | J5 pins 8 & 18 |
Speaker | J5 pins 1 - 4 | Reset switch | J5 pins 9 & 19 |
Turbo switch | J5 pins 7 & 17 | Power LED & keylock | J5 pins 11 - 15 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
| » | Monitor type select color | JP5 | Closed |
Monitor type select monochrome | JP5 | Open | |
| » | EISA EXRDY to CHRDY conversion disabled | JP7 | Open |
EISA EXRDY to CHRDY conversion enabled | JP7 | Closed | |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
4MB | (4) 1M x 9 | NONE |
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 |
64MB | (4) 16M x 9 | NONE |
128MB | (4) 16M x 9 | (4) 16M x 9 |
Note:When upgrading to 128MB, you must increase the cache to 256KB. | ||
CACHE CONFIGURATION | |||||
Size | Bank 0 | Bank 1 | TAG (U39) | TAG (U41) | TAG (U50) |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | (1) 16K x 1 | (1) 16K x 1 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | (1) 16K x 1 | (1) 16K x 1 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 | (1) 16K x 1 | (1) 16K x 1 |
CACHE JUMPER CONFIGURATION | ||||||
Size | RNA1 | RNA2 | RNB1 | RNB2 | RNC1 | RNC2 |
64KB | Installed | Installed | Not installed | Not installed | Not installed | Not installed |
128KB | Not installed | Not installed | Installed | Installed | Not installed | Not installed |
256KB | Not installed | Not installed | Not installed | Not installed | Installed | Installed |
CPU TYPE CONFIGURATION | ||||
Type | RBA | RBB | RBC | W4 |
80486SX | Installed | Not installed | Not installed | Closed |
80487SX | Not installed | Installed | Not installed | Open |
80486DX | Not installed | Not installed | Installed | Open |
80486DX2 | Not installed | Not installed | Installed | Open |
CPU SPEED CONFIGURATION | ||||
Speed | JP1 | JP2 | JP3 | JP4 |
20MHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
25MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
33MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
50iMHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
50MHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
66iMHz | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
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