ADVANCED COMPUTER TECHNOLOGY, LTD.
T486SX-20/T486DX-25/T486DX-33
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 20/25/33MHz |
Chip Set | ACT |
Max. Onboard DRAM | 32MB |
Cache | None |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & Keylock | JP22 | Speaker | JP28 |
Reset switch | JP24 | Turbo switch | JP30 |
External battery | JP25 | Turbo LED | JP31 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | RAM speed select fast (40 to 70ns) | JP4 & JP5 | pins 1 & 2 closed |
RAM speed select slow (80 to 120ns) | JP4 & JP5 | pins 2 & 3 closed | |
» | Video BIOS cacheable | JP7 | pins 1 & 2 closed |
Video BIOS non-cacheable | JP7 | pins 2 & 3 closed | |
» | Factory configured - do not alter | JP11 | N/A |
» | Monitor type select color | JP23 | pins 2 & 3 closed |
Monitor type select monochrome | JP23 | pins 1 & 2 closed | |
» | Battery select internal | JP26 | pins 1 & 2 closed |
Battery select external | JP26 | pins 2 & 3 closed | |
» | Power good signal detect from power supply | JP27 | pins 1 & 2 closed |
Power good signal detect from board | JP27 | pins 2 & 3 closed |
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 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
DRAM JUMPER CONFIGURATION | |||
Size | JP8 | JP9 | JP10 |
1MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
2MB | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
4MB | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
8MB | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
16MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
32MB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
CPU TYPE CONFIGURATION | ||||
Type | JP2 | JP3 | JP6 | JP12 |
80486SX - 20MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
80486SX - 33MHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
80487SX - 20MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
80486DX - 25/33 MHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |