PC BRAND 486/25C CACHE MAINBOARD (MYSTERY MACHINE) Processor 80486SX Processor Speed 25MHz Chip Set OPTI Max. Onboard DRAM 16MB Cache 128KB (on external cache card) BIOS AMI Dimensions 330mm x 218mm I/O Options External cache card NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Turbo switch J9 Power LED & keylock J6 Turbo LED J10 Speaker J7 External cache slot SL1 Reset switch J8 USER CONFIGURABLE SETTINGS Function Jumper Position » Battery type select internal J1 pins 2 & 3 closed Battery type select external J1 Closed » Monitor type select monochrome J2 Open Monitor type select color J2 Closed » Factory configured - do not J3 N/A alter DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (4) 256K x 9 NONE NONE NONE 2MB (4) 256K x 9 (4) 256K x 9 NONE NONE 3MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 NONE 4MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE NONE NONE 5MB (4) 256K x 9 (4) 1M x 9 NONE NONE 5MB (4) 1M x 9 (4) 256K x 9 NONE NONE 6MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 NONE 6MB (4) 256K x 9 (4) 1M x 9 (4) 256K x 9 NONE 6MB (4) 1M x 9 (4) 256K x 9 (4) 256K x 9 NONE 7MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 (4) 256K x 9 7MB (4) 256K x 9 (4) 1M x 9 (4) 256K x 9 (4) 256K x 9 7MB (4) 1M x 9 (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 NONE NONE 9MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 NONE 9MB (4) 1M x 9 (4) 1M x 9 (4) 256K x 9 NONE 9MB (4) 1M x 9 (4) 256K x 9 (4) 1M x 9 NONE 10MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 10MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 (4) 256K x 9 10MB (4) 1M x 9 (4) 1M x 9 (4) 256K x 9 (4) 256K x 9 10MB (4) 1M x 9 (4) 256K x 9 (4) 1M x 9 (4) 256K x 9 12MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 NONE 13MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 13MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 (4) 256K x 9 13MB (4) 1M x 9 (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 16MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 CACHE CONFIGURATION Size SL1 128KB Card installed CACHE JUMPER CONFIGURATION Setting J4 J5 Cache mode pins 1 & 2 closed pins 1 & 2 closed Burst mode pins 2 & 3 closed pins 2 & 3 closed