Document Number: 107315-025, Volume 1
Publication Date: January 1996
| System Boards | Assembly | Spare Part |
| 8088 System Board | 000004
000383 | Not Available
|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Function |
| OFF | Reserved (always off) | |||||||
| ON | Coprocessor not installed (default) | |||||||
| OFF | Coprocessor installed | |||||||
| OFF | OFF | Reserved (always off) | ||||||
| ON | OFF | 80 x 25 Compaq VDU primary. 1/3party monochrome secondary (default) | ||||||
| OFF | ON | 40 x 25 Compaq VDU * primary. 1/3party monochrome secondary | ||||||
| ON | ON | Compaq EGA, compatible EGA, RGBI primary. 1/3party monochrome secondary | ||||||
| OFF | OFF | 1/3party monochrome (MDA only) primary. RGBI secondary | ||||||
| ON | ON | One diskette drive (default) | ||||||
| OFF | ON | Two diskette drives | ||||||
| ON | OFF | Three diskette drives | ||||||
| OFF | OFF | Four diskette drives
|
|
* Applicable with a Revision F or later system ROM.
|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Function |
| ON | OFF | ON | ON | OFF | OFF | OFF | OFF | 128 KB total memory |
| ON | ON | OFF | ON | OFF | OFF | OFF | OFF | 192 KB total memory |
| ON | OFF | OFF | ON | OFF | OFF | OFF | OFF | 256 KB total memory |
| ON | ON | ON | OFF | OFF | OFF | OFF | OFF | 320 KB total memory |
| ON | OFF | ON | OFF | OFF | OFF | OFF | OFF | 384 KB total memory |
| ON | ON | OFF | OFF | OFF | OFF | OFF | OFF | 448 KB total memory |
| ON | OFF | OFF | OFF | OFF | OFF | OFF | OFF | 512 KB total memory |
| OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF | 544 KB total memory
|
|
* With a Revision C or later system ROM, SW2 is ignored. Revision C ROM is required to reach 640 KB.
|
| Memory Chips | Spare Part |
| 64K x 1 (150 ns) DRAM | 105152-001 |
| 64K x 4 (150 ns) DRAM | Not Available |
| 256K x 1 (150 ns) DRAM | 105151-001
|
| Controller Boards | Assembly | Spare Part |
| Diskette/Printer Board | 000010 | Not Available |
| Diskette/Printer Board | 000043 | Not Available |
| Diskette/Printer Board * | 000181-011 | Not Available |
| Hard Drive Controller Board
(Compaq Plus only) | 100637 | Not Available
|
|
* See Volume 2 Appendix, Multiproduct Boards, for settings.
|
| Video Boards | Assembly | Spare Part |
| Enhanced Color Graphics (EGA/CECGB) * ** | 000410 | Not Available |
| Enhanced Color Graphics (EGA/CECGB) * ** | 000471 | 109196-001 |
| Video Display Controller (VDU) | 000007 | 100479-001 |
| Video Display Controller (VDU) ** | 000031
000160 000345 | 101340-001 |
| Video Display Controller (VDU) ** | 000525 | 101340-001
|
|
* Requires minimum system ROM G or later.
** See Volume 2 Appendix, Multiproduct Boards, for settings. |
| Miscellaneous Boards | Assembly | Spare Part |
| Asynchronous Serial Board | 000016 | Not Available |
| Asynchronous Communications/Clock Board * | 000061 | Not Available |
| Serial/Parallel Interface Board * | 000570
000990 | 106886-001
|
|
* See Volume 2 Appendix, Multiproduct Boards, for settings.
|
| Size | Type | Interleave | Integrated | Minimum ROM | Spare Part | Controller Assembly |
| 10 MB * | 1 | 3:1 | No | C | Not Available | 100637
|
|
* Drive type set by switch settings on the hard drive controller board, or by hard wiring on the drive itself, depending on the hard drive controller board.
|
| Diskette Drives | Spare Part |
| 360 KB | Not Available
|
| Jumper | Pin 1 to Pin 2 | Pin 2 to Pin 3 |
| J702 * | COM2 Address (2FX) | COM1 Address (3FX) |
| J703 * | IRQ3 | IRQ4 |
| Shunt | Status | |
|
U11 | Pins 5 to 12, 6 to 11, 7 to 10, 8 to 9 connected
Serial RS-232-C operation | |
| Pins 1 to 16, 2 to 15, 3 to 14, 4 to 13 connected
20 mA current loop operation
|
|
* Jumpers J702 and J703 must be changed together.
|
| Jumper | Pin 1 to Pin 2 | Pin 2 to Pin 3 |
| E4 | For monitor requiring negative horizontal sync pulse | For monitor requiring positive horizontal sync pulse (default) |
| E5 | For monitor requiring positive vertical sync pulse (default) | For monitor requiring negative vertical sync pulse
|
| Processor (8088) | U24 (4.77 MHz) |
| Coprocessor (8087) | U13
|
| ROM Location | System Board | ROMs Required |
| U40 and U47 | 000004 Revision B | Need 2 ROMs |
| U40 | 000004 Revision C or later | Need 1 Revision C or later |
| U40 | 000383 All Revisions | Need 1 Revision C or later
|
| Revision | PN on ROM | Revision | PN on ROM |
| B | 100518-001 | G | 105681-001 |
| C | 100666-001 | H | 106265-001 |
| E | 100298-004 | J | 106265-002 |
| F | 100298-005 |
|
| PROM Location | Memory | PN on Chip | Spare Part |
| U35 | 256 Kbytes | 100340-001 | Not Available |
| U35 | 448 Kbytes | 101255-001 | Not Available |
| U35 | 640 Kbytes | 101257-001 | Not Available
|
| Power Supply/Battery | Spare Part |
| Battery * | 101260-001
|
|
* Mounted on Asynchronous Communications/Clock Board. |
