COMMODORE BUSINESS MACHINES, INC. 386DX System (Part #368954-01) Processor 80386DX Processor Speed 25/33MHz Chip Set PC CHIPS Max. Onboard DRAM 32MB SRAM Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port (2), VGA port NPU Options 80387/3167 [Image] CONNECTIONS Purpose Location Purpose Location VGA port C1 PS/2 style mouse C5 port Serial port 1 C2 Floppy drive C6 interface Serial port 2 C3 Hard drivve C7 interface Parallel port C4 Basic connectors C8 (pins unknown) USER CONFIGURABLE SETTINGS Function Jumper Position » Combined BIOS enabled J7 closed Combined BIOS disabled J7 open » Monitor type select color J14 pins 1 & 2 closed J20 pins 2 & 3 closed Monitor type select color J14 pins 2 & 3 disabled closed J20 pins 1 & 2 closed » Factory configured - do not alter J17 unknown » Factory configured - do not alter J18 unknown » Factory configured - do not alter J19 unknown » Factory configured - do not alter J31 unknown » VGA select zero wait states J23 closed VGA select zero wait states J23 open disabled » Monitor type select monochrome J30 open Monitor type select monochrome J30 closed disabled » Floppy drive interface (C6) J41 pins 1 & 2 enabled closed » Floppy drive interface (C6) J41 pins 2 & 3 disabled closed » Hard drive interface (C7) enabled J43 closed J44 closed Hard drive interface (C7) J43 open disabled J44 open DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 4MB (4) 1M x 9 NONE 5MB (4) 256K x 9 (4) 1M x 9 5MB (4) 1M x 9 (4) 256K x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 17MB (4) 256K x 9 (4) 4M x 9 17MB (4) 4M x 9 (4) 256K x 9 20MB (4) 1M x 9 (4) 4M x 9 20MB (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 SERIAL PORT CONFIGURATION Function Jumper Position » Serial port 1 (C2) enabled at J27 closed interrupt IRQ4 Serial port 1 (C2) disabled J27 open » Serial port 2 (C3) enabled at J29 closed interrupt select IRQ3 Serial port 2 (C3) disabled J29 open J38 pins 1 & 2 closed Serial port 1 (C2) select COM1 J39 pins 1 & 2 J40 closed pins 1 & 2 closed J38 pins 1 & 2 closed Serial port 2 (C3) select COM2 J39 pins 1 & 2 J40 closed pins 1 & 2 closed J38 pins 1 & 2 closed Serial port 1 (C2) select COM2 J39 pins 1 & 2 J40 closed pins 2 & 3 closed J38 pins 1 & 2 closed Serial port 1 (C2) select COM1 J39 pins 1 & 2 J40 closed pins 2 & 3 closed J38 pins 2 & 3 closed Serial port 1 (C2) select COM1 J39 pins 1 & 2 J40 closed pins 1 & 2 closed J38 pins 2 & 3 closed Serial port 2 (C3) disabled J39 pins 1 & 2 J40 closed pins 1 & 2 closed J38 pins 1 & 2 closed Serial port 1 (C2) disabled J39 pins 2 & 3 J40 closed pins 2 & 3 closed J38 pins 1 & 2 closed Serial port 2 (C3) select COM1 J39 pins 2 & 3 J40 closed pins 2 & 3 closed J38 pins 1 & 2 closed Serial port 1 (C2) disabled J39 pins 2 & 3 J40 closed pins 1 & 2 closed J38 pins 1 & 2 closed Serial port 2 (C3) select COM2 J39 pins 2 & 3 J40 closed pins 1 & 2 closed J38 pins 2 & 3 closed Serial port 1 (C2) select COM2 J39 pins 1 & 2 J40 closed pins 2 & 3 closed J38 pins 2 & 3 closed Serial port 2 (C3) disabled J39 pins 1 & 2 J40 closed pins 2 & 3 closed J38 pins 2 & 3 closed Serial port 1 & 2 disabled J39 pins 2 & 3 J40 closed pins 2 & 3 closed PARALLEL PORT CONFIGURATION (C4) Function Jumper Position » Parallel port enabled at IRQ7 J28 pins 2 & 3 closed Parallel port enabled at IRQ5 J28 pins 1 & 2 closed Parallel port enable LPT1 J36 pins 2 & 3 closed J37 pins 1 & 2 closed Parallel port enable LPT2 J36 pins 1 & 2 closed J37 pins 1 & 2 closed Parallel port enable LPT3 J36 pins 1 & 2 closed J37 pins 2 & 3 closed Parallel port disabled J36 pins 2 & 3 closed J37 pins 2 & 3 closed SRAM JUMPER CONFIGURATION Size Jumper Jumper Jumper Jumper Jumper Jumper Jumper Jumper J8 J9 J11 J12 J13 J15 J16 J42 Disabled closed pins 1 pins 1 N/A N/A open N/A N/A & 2 & 2 closed closed 64KB closed pins 2 pins 2 pins 1 pins 1 closed pins 2 pins 1 & 3 & 3 & 2 & 2 & 3 & 2 closed closed closed closed closed closed 128KB closed pins 2 pins 2 pins 2 pins 1 closed open pins 2 & 3 & 3 & 3 & 2 & 3 closed closed closed closed closed 256KB closed pins 2 pins 2 pins 2 pins 1 closed pins 1 pins 2 & 3 & 3 & 3 & 2 & 2 & 3 closed closed closed closed closed closed SRAM CONFIGURATION Size Cache SRAM Location TAG (UAA) TAG (U11) 64KB (8) 8K x 8 Banks 0 & 1 (1) 8K x 8 (1) 8K x 8 128KB (4) 32K x 8 Bank 0 (1) 32K x 8 NONE 256KB (8) 32K x 8 Banks 0 & 1 (1) 32K x 8 (1) 32K x 8 VIDEO SWITCH CONFIGURATION (SW1) Mode switch switch switch switch switch 5 1 2 3 4 56Hz vertical open open N/A N/A N/A refresh 60Hz vertical open closed N/A N/A N/A refresh 72Hz vertical closed open N/A N/A N/A refresh Enable interlaced N/A N/A open open N/A 60Hz non-interlaced N/A N/A open closed N/A 72Hz non-interlaced N/A N/A closed open N/A 31.5KHz horizontal N/A N/A N/A N/A open scan rate 40KHz horizontal N/A N/A N/A N/A closed scan rate VRAM CONFIGURATION Size VRAM SW1/switch 6 512KB (2) 256K x 4 closed 1MB (4) 256K x 4 open