MICRONICS COMPUTERS, INC. 80486 ASIC EISA SYSTEM BOARD Processor 80486DX/80486DX2 Processor Speed 33/50(internal)MHz Chip Set Intel Max. Onboard DRAM 64MB Cache 64/256KB BIOS Phoenix Dimensions 355mm x 304mm I/O Options 32-bit local bus slot, floppy drive interface, parallel port, serial ports (2) NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location External keyboard J1 Speaker J22 connector Parallel port J4 Power LED & keylock J23 Serial port 1 J5 32-bit Local bus S1 slot Serial port 2 J15 Reset switch W5 Floppy drive interface J17 Turbo switch W6 External battery J17A Turbo LED W7 USER CONFIGURABLE SETTINGS Function Jumper/Switch Position » Factory configured - do not SW1/6 On alter » Factory configured - do not SW1/7 Off alter » Monitor type select color SW1/8 On Monitor type select SW1/8 Off monochrome » Factory configured - do not W11 pins 2 & 3 alter closed » Factory configured - do not W12 pins 1 & 2 alter closed » Floppy drive interface W13 pins 1 & 2 enabled closed Floppy drive interface W13 pins 2 & 3 disabled closed » CPU select 486DX2/50MHz W43 pins 1 & 2 closed CPU select 486DX/33MHz W43 Open » Factory configured - do not W45 pins 1 & 2 alter closed PARALLEL PORT CONFIGURATION I/O Address Port W3 W4 W10 3BC-3BEh LPT1 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed 378-37Ah LPT2 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 278-27Ah LPT3 pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed N/A Disabled pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed SERIAL PORT CONFIGURATION Port 1 Port 2 W2 W8 W9 COM1 COM2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed COM1 Disabled pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed Disabled COM2 pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed Disabled Disabled pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed 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 6MB (4)256K x 9 (4)256K x 9 (4)1M x 9 NONE 7MB (4)256K x 9 (4)256K x 9 (4)256K x 9 (4)1M 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 (4)1M x 9 10MB (4)256K x 9 (4)256K x 9 (4)1M x 9 (4)1M 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 16MB (4)1M x 9 (4)1M x 9 (4)1M x 9 (4)1M x 9 16MB (4)4M x 9 NONE NONE NONE 20MB (4)1M x 9 (4)4M x 9 NONE NONE 24MB (4)1M x 9 (4)1M x 9 (4)4M x 9 NONE 28MB (4)1M x 9 (4)1M x 9 (4)1M x 9 (4)4M x 9 32MB (4)4M x 9 (4)4M x 9 NONE NONE 36MB (4)1M x 9 (4)4M x 9 (4)4M x 9 NONE 40MB (4)1M x 9 (4)1M x 9 (4)4M x 9 (4)4M x 9 48MB (4)4M x 9 (4)4M x 9 (4)4M x 9 NONE 52MB (4)1M x 9 (4)4M x 9 (4)4M x 9 (4)4M x 9 64MB (4)4M x 9 (4)4M x 9 (4)4M x 9 (4)4M x 9 DRAM SWITCH CONFIGURATION Size SW1/switch SW1/switch SW1/switch SW1/switch SW1/switch 1 2 3 4 5 1MB On On On On On 2MB Off On On On On 3MB On Off On On On 4MB Off Off On On On 4MB On On Off On On 5MB On On Off Off On 6MB On Off On Off On 7MB Off On On Off On 8MB Off On Off On On 9MB On Off Off Off On 10MB Off Off On Off On 12MB On Off Off On On 13MB Off Off Off Off On 16MB On On Off On On 16MB Off Off Off On Off DRAM SWITCH CONFIGURATION (CONT.) Size SW1/switch SW1/switch SW1/switch SW1/switch SW1/switch 1 2 3 4 5 20MB On On Off Off Off 24MB On Off On Off Off 28MB Off On On Off Off 32MB Off On Off On Off 36MB On Off Off Off Off 40MB Off Off On Off Off 48MB On Off Off On Off 52MB Off Off Off Off Off 64MB Off Off Off On Off CACHE CONFIGURATION Size Bank 0 Bank 1 TAG 64KB (4) 8K x 8 (4) 8K x 8 (1) 32K x 8 256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8 Note:The exact location of TAG is unknown. CACHE JUMPER CONFIGURATION Size W20 W21 W41 W44 64KB Open Open Open Pins 2 & 3 closed 256KB Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed closed