UNIDENTIFIED TOPCAT 386SX Processor 80386SX Processor Speed 16/20/25MHz Chip Set Unidentified Max. Onboard DRAM 32MB Cache None BIOS AMI/Award/Phoenix/Quadtel Dimensions 236mm x 220mm I/O Options None NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location Speaker CN1 Turbo LED JP1 External battery CN3 Turbo switch JP6 Power LED & keylock CN4 Reset switch JP10 USER CONFIGURABLE SETTINGS Function Jumper Position Power good signal detect from board CN2 pins 1 & 2 closed Power good signal detect from power CN21 pins 2 & 3 supply closed CMOS memory normal operation HDR1 pins 1 & 2 closed CMOS memory clear HDR1 pins 3 & 4 closed BIOS type select Phoenix JP2 pins 1 & 2 closed BIOS type select AMI/Award/Quadtel JP2 pins 2 & 3 closed CPU speed select hardware/external JP3 pins 1 & 2 switch closed CPU speed select keyboard control JP3 pins 2 & 3 closed Monitor type select color JP4 Closed Monitor type select monochrome JP4 Open Parity enabled JP7 Closed Parity disabled JP7 Open DRAM CONFIGURATION Size Bank 0A Bank 1A Bank 0 Bank 1 Bank 2 Bank 3 512KB (4) NONE NONE NONE NONE NONE 44256 1MB (4) (4) NONE NONE NONE NONE 44256 44256 1.5MB (4) NONE (2) (2) NONE NONE 44256 256K x 256K x 9 9 2MB NONE NONE (2) 1M NONE NONE NONE x 9 3MB (4) (4) (2) 1M NONE NONE NONE 44256 44256 x 9 4MB NONE NONE (2) 1M (2) 1M NONE NONE x 9 x 9 4.5MB (4) NONE (2) 1M (2) 1M NONE NONE 44256 x 9 x 9 5MB (4) (4) (2) 1M (2) 1M NONE NONE 44256 44256 x 9 x 9 6MB NONE NONE (2) 1M (2) 1M (2) 1M NONE x 9 x 9 x 9 8MB NONE NONE (2) 1M (2) 1M (2) 1M (2) 1M x 9 x 9 x 9 x 9 8MB NONE NONE (2) 4M NONE NONE NONE x 9 9MB (4) (4) (2) 1M (2) 1M (2) 1M (2) 1M 44256 44256 x 9 x 9 x 9 x 9 9MB (4) (4) (2) 4M NONE NONE NONE 44256 44256 x 9 12MB NONE NONE (2) 1M (2) 1M (2) 4M NONE x 9 x 9 x 9 16MB NONE NONE (2) 4M (2) 4M NONE NONE x 9 x 9 16.5MB (4) NONE (2) 4M (2) 4M NONE NONE 44256 x 9 x 9 17MB (4) (4) (2) 4M (2) 4M NONE NONE 44256 44256 x 9 x 9 18MB NONE NONE (2) 4M (2) 4M (2) 1M NONE x 9 x 9 x 9 20MB NONE NONE (2) 1M (2) 1M (2) 4M (2) 4M x 9 x 9 x 9 x 9 20MB NONE NONE (2) 4M (2) 4M (2) 1M (2) 1M x 9 x 9 x 9 x 9 24MB NONE NONE (2) 4M (2) 4M (2) 4M NONE x 9 x 9 x 9 32MB NONE NONE (2) 4M (2) 4M (2) 4M (2) 4M x 9 x 9 x 9 x 9 DRAM PARITY CONFIGURATION Size P 0 P 1 512KB (2) 41256 NONE 1MB (2) 41256 (2) 41256 1.5MB (2) 41256 (2) 41256 3MB (2) 41256 (2) 41256 4.5MB (2) 41256 NONE 5MB (2) 41256 (2) 41256 9MB (2) 41256 (2) 41256 9MB (2) 41256 (2) 41256 16.5MB (2) 41256 NONE 17MB (2) 41256 (2) 41256 17MB (2) 41256 (2) 41256 Note: If Bank 0A and/or Bank 1A is filled, use this table to determine correct parity.