COMMODORE BUSINESS MACHINES, INC. 386SX Processor 80386SX Processor Speed 16/20/25MHz Chip Set Unknown Max. Onboard DRAM 16MB Cache None BIOS Commodore Dimensions 254mm x 218mm I/O Options 16-bit riser card slot, bus mouse port, floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA interface NPU Options 80387SX [Image] CONNECTIONS Purpose Location Purpose Location 16-bit riser card CN1 Turbo LED J3 VGA port CN2 Turbo switch J4 Serial port 2 CN3 Reset switch J5 Serial port 1 CN4 IDE interface J9 Parallel port CN5 Floppy drive interface J10 Bus mouse port CN6 Game port J12 Power LED & keylock J1 External battery J15 IDE interface LED J2 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color J6 Closed Monitor type select monochrome J6 Open » IDE interface enabled J7 and J8 Closed IDE interface disabled J7 and J8 Open » Battery type select internal J14 pins 1 & 2 closed Battery type select external J14 pins 2 & 3 closed » VGA port wait states select one J16 Open VGA port wait states select zero J16 Closed » VGA port enabled J17 Closed VGA port disabled J17 Open » Floppy interface enabled J23 pins 1 & 2 closed Floppy interface disabled J23 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 1MB (2) 256K x (2) 256K x NONE NONE 9 9 1.5MB (2) 256K x (2) 256K x (2) 256K x NONE 9 9 9 2MB (2) 256K x (2) 256K x (2) 256K x (2) 256K x 9 9 9 9 2MB (2) 1M x 9 NONE NONE NONE 3MB (2) 256K x (2) 256K x (2) 1M x 9 NONE 9 9 4MB (2) 1M x 9 (2) 1M x 9 NONE NONE 5MB (2) 256K x (2) 256K x (2) 1M x 9 (2) 1M x 9 9 9 6MB (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 NONE 8MB (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 (2) 1M x 9 12MB (2) 1M x 9 (2) 1M x 9 (2) 4M x 9 NONE 16MB (2) 4M x 9 (2) 4M x 9 NONE NONE PARALLEL PORT CONFIGURATION Parallel port IRQ J13 J18 J19 LPT1 5 pins 3 & 4 Open Closed closed LPT1 7 pins 1 & 2 Open Closed closed LPT2 5 pins 3 & 4 Closed Closed closed LPT2 7 pins 1 & 2 Closed Closed closed LPT3 5 pins 3 & 4 Closed Open closed LPT3 7 pins 1 & 2 Closed Open closed Disabled N/A N/A Open Open SERIAL PORT CONFIGURATION UART1 UART2 J20 J21 J22 COM1 COM2 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed COM1 Disabled pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed COM2 COM1 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed Disabled COM1 pins 2 & 3 pins 1 & 2 pins 2 & 3 closed closed closed Disabled COM2 pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed COM2 Disabled pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed Disabled Disabled pins 2 & 3 pins 2 & 3 N/A closed closed