COMPAQ COMPUTER CORPORATION
Portable (PLUS) (Model 00004-Rev. C or earlier)
| Processor | 8088 | 
| Processor Speed | 4.77MHz | 
| Chip Set | None | 
| Max. Onboard DRAM | 640KB | 
| Cache | None | 
| BIOS | Compaq | 
| Dimensions | 372mm x 180mm | 
| I/O Options | None | 
| NPU Options | 8087 | 
 
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location | 
| Main power | P0 | Speaker | SPK | 
| USER CONFIGURABLE SETTINGS | |||
| Function | Switch | Position | |
| » | Factory configured - do not alter | SW1/1 | Off | 
| » | NPU disabled | SW1/2 | On | 
| NPU enabled | SW1/2 | Off | |
| » | Factory configured - do not alter | SW1/3 | Off | 
| » | Factory configured - do not alter | SW1/4 | Off | 
| DRAM CONFIGURATION | ||||
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 | 
| 128KB | (9) 4164 | (9) 4164 | NONE | NONE | 
| 192KB | (9) 4164 | (9) 4164 | (9) 4164 | NONE | 
| 256KB | (9) 4164 | (9) 4164 | (9) 4164 | (9) 4164 | 
| 384KB | (9) 4164 | (9) 4164 | (9) 41256 | NONE | 
| 448KB | (9) 4164 | (9) 4164 | (9) 4164 | (9) 41256 | 
| 512KB | (9) 41256 | (9) 41256 | NONE | NONE | 
| 544KB | (9) 4164 | (9) 4164 | (9) 41256 | (9) 41256 | 
| 640KB | (9) 4164 | (9) 4164 | (9) 41256 | (9) 41256 | 
| Note:640KB requires ROM version C or later in which case SW2 switch settings are ignored. | ||||
| DRAM SWITCH CONFIGURATION | ||||||||
| Size | SW2/1 | SW2/2 | SW2/3 | SW2/4 | SW2/5 | SW2/6 | SW2/7 | SW2/8 | 
| 128KB | On | Off | On | On | Off | Off | Off | Off | 
| 192KB | On | On | Off | On | Off | Off | Off | Off | 
| 256KB | On | Off | Off | On | Off | Off | Off | Off | 
| 320KB | On | On | On | Off | Off | Off | Off | Off | 
| 384KB | On | Off | On | Off | Off | Off | Off | Off | 
| 448KB | On | On | Off | Off | Off | Off | Off | Off | 
| 512KB | On | Off | Off | Off | Off | Off | Off | Off | 
| 544KB | Off | Off | Off | Off | Off | Off | Off | Off | 
| FLOPPY DRIVE CONFIGURATION | ||
| Drives installed | SW1/7 | SW1/8 | 
| 1 | On | On | 
| 2 | Off | On | 
| 3 | On | Off | 
| 4 | Off | Off | 
| MONITOR CONFIGURATION | ||
| Type | SW1/5 | SW1/6 | 
| 80 x 25 color (Compaq VDU) | On | Off | 
| 40 x 25 color (Compaq VDU) | Off | On | 
| 80 x 25 color (EGA or RGBI) | On | On | 
| Monochrome | Off | Off |