UNITRON COMPUTER, INC. 486SX SYSTEM Processor 80486SX/80486DX Processor Speed 25/33MHz Chip Set UMC Max. Onboard DRAM 32MB SRAM Cache 32/128KB BIOS Phoenix Dimensions 346mm x 218mm I/O Options Floppy drive interface, game port, IDE interface, modem interface, parallel port, serial port (2), VGA port NPU Options 4167 (location unverified) [Image] CONNECTIONS Purpose Location Purpose Location Game port C1 IDE interface J22 VGA port C2 Modem interface J23 Parallel port C3 Turbo LED J26 Serial port 2 C4 Power LED J28 Serial port 1 C5 Floppy drive interface J31 Fan power J3 USER CONFIGURABLE SETTINGS Function Jumper Position » Serial port 1 (CN5) enabled J18 pins 1 & 2 closed Serial port 1 (CN5) disabled J18 pins 2 & 3 closed » Serial port 1 (CN5) select COM1 J19 pins 1 & 2 (I/O address 3F8-3FFh) closed Serial port 1 (CN5) select COM3 J19 pins 2 & 3 (I/O address 3E8-3EFh) closed » Parallel port (C3) select LPT1 J20 pins 1 & 2 interrupt IRQ7 at 378-37F closed Parallel port (C3) select LPT2 J20 pins 2 & 3 interrupt IRQ5 at 278-27F closed » Parallel port (CN3) enabled J21 pins 1 & 2 closed Parallel port (CN3) disabled J21 pins 2 & 3 closed » IDE interface (J22) enabled J25 pins 1 & 2 closed IDE interface (J22) disabled J25 pins 2 & 3 closed » Floppy drive interface (J31) J27 pins 1 & 2 enabled closed Floppy drive interface (J31) J27 pins 2 & 3 disabled closed » Serial port 2 (CN4) select COM2 J29 pins 1 & 2 (I/O address 2F8-2FFh) closed Serial port 2 (CN4) select COM4 J29 pins 2 & 3 (I/O address 2E8-2EFh) closed » Serial port 2 (CN4) enabled J30 pins 1 & 2 closed Serial port 2 (CN4) disabled J30 pins 2 & 3 closed DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (1) 256K x 36 NONE 2MB (1) 256K x 36 (1) 256K x 36 3MB (1) 512K x 36 (1) 256K x 36 4MB (1) 1M x 36 NONE 5MB (1) 256K x 36 (1) 1M x 36 8MB (1) 1M x 36 (1) 1M x 36 12MB (1) 2M x 36 (1) 1M x 36 16MB (1) 2M x 36 (1) 2M x 36 32MB (1) 4M x 36 (1) 4M x 36 CPU TYPE CONFIGURATION CPU JP1 JP2 80486DX pins 1 & 2 closed pins 1 & 2 and 3 & 4 closed 80486SX open pins 2 & 3 closed Note:The location of jumpers JP1 and JP2 is unknown. SRAM JUMPER CONFIGURATION Size J7 J10 J11 J13 J14 32KB open pins 1 & pins 1 & pins 1 & pins 1 & 2 2 2 2 128KB closed pins 2 & pins 2 & pins 2 & pins 2 & 3 3 3 3 Note:Pins designated should be in the closed postion. SRAM CONFIGURATION Size Cache SRAM Location TAG 32KB (4) 8K x 8 CACHE (1) 8K x 8 128KB (4) 32K x 8 CACHE (1) 32K x 8 Note:This configuartion is unverified. VRAM CONFIGURATION Size VRAM Location 256KB (2) 44256 Bank 0 512KB (4) 44256 Banks 0 & 1 1MB (8) 44256 Banks 0, 1, 2 and 3