COMPAQ COMPUTER CORPORATION DESKPRO 286 (VERSION 1) Processor 80286 Processor Speed 8MHz Chip Set ETEQ Max. Onboard DRAM 2.125MB (on system memory card) Cache None BIOS Compaq Dimensions 330mm x 218mm I/O Options Proprietary system memory card NPU Options 80287 [Image] CONNECTIONS Purpose Location Purpose Location Keyboard power fuse F1 Speaker J115 Monitor power fuse F2 Proprietary keyboard J116 plug Fixed drive power J109 Main power J117 Fixed drive/tape J110 External battery J118 backup power Floppy drive power J111 Keylock J119 Floppy drive power J112 Onboard power LED LED1 Monitor power J113 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select Compaq ED pins 2 & 3 graphics/color closed Monitor type select monochrome ED pins 1 & 2 other than Compaq closed » Factory configured - do not alter EM pins 1 & 2 closed » CPU speed select switchable at ES pins 1 & 2 keyboard closed CPU speed select forced slow ES pins 2 & 3 closed SYSTEM MEMORY CARD (VERSION 1) [Image] ROM JUMPER CONFIGURATION ROM type Size Speed BIOS ROM / Jumper ROM set 2 / block E Jumper block E Static 8K x 8 250ns pins 7&8, 10&11, pins 1&2, 4&5, 13&14 closed 22&23 closed 1 Static 16K x 250ns pins 8&9, 10&11, pins 2&3, 4&5, 8 13&14 closed 22&23 closed Static 32K x 250ns pins 8&9, 11&12, pins 2&3, 5&6, 8 13&14 closed 22&23 closed Dynamic 8K x 8 150ns pins 7&8, 10&11, pins 1&2, 4&5, 14&15 closed 20&21 closed Dynamic 16K x 150ns pins 8&9, 10&11, pins 2&3, 4&5, 8 14&15 closed 20&21 closed 2Dynamic 32K x 150ns pins 8&9, 11&12, pins 2&3, 5&6, 8 14&15 closed 20&21 closed Note: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations. 1) Default for BIOS ROM 2) Default for ROM set 2 WARNING: Modifying the factory configurations will void the manufacturers warranty! DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 Bank 4 256KB (2) 64K (18) 4164 NONE NONE NONE x 9 512KB (2) 64K (18) 4164 (18) 4164 (18) 4164 NONE x 9 640KB (2) 64K (18) 4164 (18) 4164 (18) 4164 (18) 4164 x 9 640KB (2) 64K (18) NONE NONE NONE x 9 41256 1.125MB (2) 64K (18) (18) NONE NONE x 9 41256 41256 1.625MB (2) 64K (18) (18) (18) NONE x 9 41256 41256 41256 2.125MB (2) 64K (18) (18) (18) (18) 41256 x 9 41256 41256 41256 Note: Bank 0is permanently affixed to the memory board and is not alterable. DRAM JUMPER CONFIGURATION Size E1 E2 256KB pins 1 & 2 closed pins 2 & 3 closed 512KB pins 1 & 2 closed pins 1 & 2 closed 640KB pins 1 & 2 closed pins 2 & 3 closed 640KB pins 2 & 3 closed pins 1 & 2 closed 1.125MB pins 2 & 3 closed pins 2 & 3 closed 1.625MB pins 2 & 3 closed pins 2 & 3 closed 2.125MB pins 2 & 3 closed pins 2 & 3 closed SYSTEM MEMORY CARD (VERSIONS 2 & 3) [Image] Note: Versions 2 & 3 are differentiated by Their assembly numbers Version 2 has assembly #'s 000178-XXX Version 3 has assembly #'s 000382-XXX DRAM CONFIGURATION Size Bank 0 P-0 Bank 1 Bank 2 Bank 3 Bank 4 256KB (4) (2) (18) NONE NONE NONE 4464 4164 4164 512KB (4) (2) (18) (18) (18) NONE 4464 4164 4164 4164 4164 640KB (4) (2) (18) (18) (18) (18) 4164 4464 4164 4164 4164 4164 * 640KB (4) (2) (18) NONE NONE NONE 4464 4164 41256 1.125MB (4) (2) (18) (18) NONE NONE 4464 4164 41256 41256 1.625MB (4) (2) (18) (18) (18) NONE 4464 4164 41256 41256 41256 2.125MB (4) (2) (18) (18) (18) (18) 4464 4164 41256 41256 41256 41256 Notes: Version 3 of the system memory board does not support the second 640KB configuration using (18) 41256 chips in bank 1. Bank 0 is permanently affixed to the memory board and is not alterable. DRAM JUMPER CONFIGURATION Size Version 2 E1 Version 3 E1 256KB pins 1 & 2 and 4 & 5 closed pins 2 & 3 and 4 & 5 closed 512KB pins 1 & 2 and 4 & 5 closed pins 1 & 2 and 4 & 5 closed 640KB pins 1 & 2 and 5 & 6 closed pins 1 & 2 and 5 & 6 closed 640KB pins 2 & 3 and 4 & 5 closed N/A 1.125MB pins 2 & 3 and 5 & 6 closed pins 2 & 3 and 5 & 6 closed 1.625MB pins 2 & 3 and 5 & 6 closed pins 2 & 3 and 5 & 6 closed 2.125MB pins 2 & 3 and 5 & 6 closed pins 2 & 3 and 5 & 6 closed ROM JUMPER CONFIGURATION ROM type Size Speed BIOS ROM/Jumper ROM set 2/Jumper Block E2 Block E3 Static 8K x 8 250ns pins 1&2, 4&5, 7&8 pins 1&2, 4&5, closed 7&8 closed 1Static 16K x 250ns pins 2&3, 4&5, 7&8 pins 2&3, 4&5, 8 closed 7&8 closed Static 32K x 250ns pins 2&3, 5&6, 7&8 pins 2&3, 5&6, 8 closed 7&8 closed Dynamic 8K x 8 150ns pins 1&2, 4&5, 8&9 pins 1&2, 4&5, closed 8&9 closed Dynamic 16K x 150ns pins 2&3, 4&5, 8&9 pins 2&3, 4&5, 8 closed 8&9 closed 2Dynamic 32K x 150ns pins 2&3, 5&6, 8&9 pins 2&3, 5&6, 8 closed 8&9 closed Notes: Settings are accomplished by cutting the conductors on the bottom of the board and re-soldering the indicated locations. 1) Default for BIOS ROM 2) Default for ROM set 2 WARNING: Modifying the factory configurations will void the manufacturers warranty!