ZEOS INTERNATIONAL, LTD.
386SX-20
| Processor | 80386SX | 
| Processor Speed | 20MHz | 
| Chip Set | Unidentified | 
| Max. Onboard DRAM | 16MB | 
| Cache | None | 
| BIOS | Award | 
| Dimensions | 330mm x 218mm | 
| I/O Options | serial ports (2), parallel port, floppy drive interface, IDE interface, game port | 
| NPU Options | 80387SX | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| External battery | J1 | Turbo switch | J10 | 
| Game port | J3 | Reset switch | J11 | 
| Parallel port | J5 | Turbo LED | J12 | 
| Serial port 2 | J6 | Power LED & keylock | J13 | 
| Serial port 1 | J7 | Speaker | J14 | 
| Floppy drive interface | J8 | IDE interface LED | J15 | 
| IDE interface | J9 | ||
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| » | Monitor type select CGA | J4 | Closed | 
| Monitor type select Mono/EGA/VGA | J4 | Open | |
| » | Game port enabled | P1 | Closed | 
| Game port disabled | P1 | Open | |
| » | Parallel port interupt select IRQ7 | PIRQ | pins 1 & 2 closed | 
| Parallel port interupt select IRQ5 | PIRQ | pins 2 & 3 closed | |
| Parallel port interupt disabled | PIRQ | all open | |
| » | Serial port 1 (COM1) interupt select IRQ4 | SIRQ1 | pins 2 & 3 closed | 
| Serial port 1 (COM1) interupt select IRQ3 | SIRQ1 | pins 1 & 2 closed | |
| Serial port 1 (COM1) interupt disabled | SIRQ1 | all open | |
| » | Serial port 2 (COM2) interupt select IRQ3 | SIRQ2 | pins 1 & 2 closed | 
| Serial port 2 (COM2) interupt select IRQ4 | SIRQ2 | pins 2 & 3 closed | |
| Serial port 2 (COM2) interupt disabled | SIRQ2 | all open | |
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 512KB | (2) 256K x 9 | NONE | NONE | NONE | 
| 1MB | (2) 256K x 9 | (2) 256K x 9 | NONE | NONE | 
| 1.5MB | (2) 256K x 9 | (2) 256K x 9 | (2) 256K x 9 | NONE | 
| 2MB | (2) 256K x 9 | (2) 256K x 9 | (2) 256K x 9 | (2) 256K x 9 | 
| 2MB | (2) 1M x 9 | NONE | NONE | NONE | 
| 3MB | (2) 1M x 9 | (2) 256K x 9 | (2) 256K x 9 | NONE | 
| 4MB | (2) 1M x 9 | (2) 1M x 9 | NONE | NONE | 
| 5MB | (2) 1M x 9 | (2) 1M x 9 | (2) 256K x 9 | (2) 256K x 9 | 
| 6MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE | 
| 8MB | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | 
| 8MB | (2) 4M x 9 | NONE | NONE | NONE | 
| 9MB | (2) 4M x 9 | (2) 256K x 9 | (2) 256K x 9 | NONE | 
| 10MB | (2) 4M x 9 | (2) 1M x 9 | NONE | NONE | 
| 11MB | (2) 4M x 9 | (2) 1M x 9 | (2) 256K x 9 | (2) 256K x 9 | 
| 12MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | NONE | 
| 14MB | (2) 4M x 9 | (2) 1M x 9 | (2) 1M x 9 | (2) 1M x 9 | 
| 16MB | (2) 4M x 9 | (2) 4M x 9 | NONE | NONE |