UNIDENTIFIED
TOPCAT 386SX
| Processor | 80386SX | 
| Processor Speed | 16/20/25MHz | 
| Chip Set | Unidentified | 
| Max. Onboard DRAM | 32MB | 
| Cache | None | 
| BIOS | AMI/Award/Phoenix/Quadtel | 
| Dimensions | 236mm x 220mm | 
| I/O Options | None | 
| NPU Options | 80387SX | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Speaker | CN1 | Turbo LED | JP1 | 
| External battery | CN3 | Turbo switch | JP6 | 
| Power LED & keylock | CN4 | Reset switch | JP10 | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| Power good signal detect from board | CN2 | pins 1 & 2 closed | |
| Power good signal detect from power supply | CN21 | pins 2 & 3 closed | |
| CMOS memory normal operation | HDR1 | pins 1 & 2 closed | |
| CMOS memory clear | HDR1 | pins 3 & 4 closed | |
| BIOS type select Phoenix | JP2 | pins 1 & 2 closed | |
| BIOS type select AMI/Award/Quadtel | JP2 | pins 2 & 3 closed | |
| CPU speed select hardware/external switch | JP3 | pins 1 & 2 closed | |
| CPU speed select keyboard control | JP3 | pins 2 & 3 closed | |
| Monitor type select color | JP4 | Closed | |
| Monitor type select monochrome | JP4 | Open | |
| Parity enabled | JP7 | Closed | |
| Parity disabled | JP7 | Open | |
| DRAM CONFIGURATION | ||||||
| Size | Bank 0A | Bank 1A | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 512KB | (4) 44256 | NONE | NONE | NONE | NONE | NONE | 
| 1MB | (4) 44256 | (4) 44256 | NONE | NONE | NONE | NONE | 
| 1.5MB | (4) 44256 | NONE | (2) 256K x 9 | (2) 256K x 9 | NONE | NONE | 
| 2MB | NONE | NONE | (2) 1M x 9 | NONE | NONE | NONE | 
| 3MB | (4) 44256 | (4) 44256 | (2) 1M x 9 | NONE | NONE | NONE | 
| 4MB | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE | 
| 4.5MB | (4) 44256 | NONE | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE | 
| 5MB | (4) 44256 | (4) 44256 | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE | 
| 6MB | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE | 
| 8MB | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | 
| 8MB | NONE | NONE | (2) 4M x 9 | NONE | NONE | NONE | 
| 9MB | (4) 44256 | (4) 44256 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | 
| 9MB | (4) 44256 | (4) 44256 | (2) 4M x 9 | NONE | NONE | NONE | 
| 12MB | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 | NONE | 
| 16MB | NONE | NONE | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE | 
| 16.5MB | (4) 44256 | NONE | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE | 
| 17MB | (4) 44256 | (4) 44256 | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE | 
| 18MB | NONE | NONE | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 | NONE | 
| 20MB | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 | (2) 4M x 9 | (2) 4M x 9 | 
| 20MB | NONE | NONE | (2) 4M x 9 | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | 
| 24MB | NONE | NONE | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | NONE | 
| 32MB | NONE | NONE | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | (2) 4M x 9 | 
| DRAM PARITY CONFIGURATION | ||
| Size | P 0 | P 1 | 
| 512KB | (2) 41256 | NONE | 
| 1MB | (2) 41256 | (2) 41256 | 
| 1.5MB | (2) 41256 | (2) 41256 | 
| 3MB | (2) 41256 | (2) 41256 | 
| 4.5MB | (2) 41256 | NONE | 
| 5MB | (2) 41256 | (2) 41256 | 
| 9MB | (2) 41256 | (2) 41256 | 
| 9MB | (2) 41256 | (2) 41256 | 
| 16.5MB | (2) 41256 | NONE | 
| 17MB | (2) 41256 | (2) 41256 | 
| 17MB | (2) 41256 | (2) 41256 | 
| Note: If Bank 0A and/or Bank 1A is filled, use this table to determine correct parity. | ||