INTERCOMP, INC. 486 PERSONAL WORKSTATION Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2/80586SX Processor Speed 20/25/33/50(Internal)/50/66(Internal)MHz Chip Set Intercomp/OPTI Max. onboard DRAM64MB SRAM Cache 64/128/256KB BIOS AMI Dimensions 330mm x 218mm I/O Options 32-bit VESA local bus slots (2), 10 base T ethernet floppy drive interface, IDE interface, parallel port serial port (2), VGA port, VGA feature connector NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery P5 VGA feature P21 connector Serial port (COM2) P7 Keylock P31A Serial port (COM1) P8 Speaker P31B IDE interface P9 IDE interface LED P31D Parallel port P10 Turbo LED P31E Floppy drive P11 Turbo Switch P31F interface 10 base T ethernet P18 Reset P31G VGA Port P20 32-bit VESA local S1 & S2 bus slots USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation P3 Open CMOS memory clear P3 Closed » VESA bus enabled P13 Pins 1 & 2, 3 & 5, 4 & 6 closed VESA bus disabled P13 Pins 1 & 2, 5 & 7, 6 & 8 closed » IDE select single mode P19 Pins 1 & 2 closed IDE select master/slave mode P19 Pins 1 & 2 open » LPT select output mode P19 Pins 3 & 4 closed LPT select input/output mode P19 Pins 3 & 4 closed » Factory configured do not P22 Pins 2 & 3 closed alter » VESA bus VGA controller P23 Pins 2 & 3 closed enabled VESA bus VGA controller P23 Pins 1 & 2 closed disabled » Factory configured do not P24 Pins 2 & 3 closed alter » Factory configured do not P25 Pins 1 & 2 closed alter » Factory configured do not P26 Pins 2 & 3 closed alter » Monitor type select color P31C Open Monitor type select P31C Closed monochrome Note: VESA bus should be disabled for 50MHz CPU speed operation. VESA WAIT STATE (ID2) CONFIGURATION Wait states CPU speed P14 (ID2) 0 wait states £ 33MHz Pins 1 & 2 open 1 wait state > 33MHz Pins 1 & 2 closed VESA BUS SPEED (ID3) CONFIGURATION CPU speed P14 (ID3) £ 33MHz Pins 3 & 4 open > 33MHz Pins 3 & 4 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 NONE 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 17MB (4) 256K x 9 (4) 4M x 9 NONE NONE 18MB (4) 256K x 9 (4) 256K x 9 (4) 4M x 9 NONE 19MB (4) 256K x 9 (4) 256K x 9 (4) 256K x 9 (4) 4M x 9 20MB (4) 1M x 9 (4) 4M x 9 NONE NONE 21MB (4) 256K x 9 (4) 1M x 9 (4) 4M x 9 NONE 22MB (4) 256K x 9 (4) 256K x 9 (4) 1M x 9 (4) 4M x 9 24MB (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 NONE 25MB (4) 256K x 9 (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 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 33MB (4) 256K x 9 (4) 4M x 9 (4) 4M x 9 NONE 36MB (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 NONE 37MB (4) 256K x 9 (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 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 49MB (4) 256K x 9 (4) 4M x 9 (4) 4M x 9 (4) 4M x 9 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 CACHE CONFIGURATION Size Cache Location TAG 64KB (8) 8K x 8 Banks 0 & 1 (1) 16K x 4 128KB (4) 32K x 8 Bank 0 (1) 16K x 4 256KB (8) 32K x 8 Banks 0 & 1 (1) 16K x 4 CACHE JUMPER CONFIGURATION Size P15 64KB Pins 3 & 5, 4 & 6, 7 & 8 closed 128KB Pins 1 & 3, 2 & 4, 7 & 8, 9 & 10 closed 256KB Pins 3 & 5, 4 & 6, 7 & 8, 9 & 10, 11 & 12 closed VIDEO START UP CONFIGURATION Mode P27 P28 P29 640 x 480, 60Hz Pins 1 & 2 Pins 1 & 2 Pins 1 & 2 closed closed closed 640 x 480, 70Hz Pins 2 & 3 Pins 1 & 2 Pins 1 & 2 closed closed closed 800 x 600, 56Hz Pins 1 & 2 Pins 1 & 2 Pins 2 & 3 closed closed closed 800 x 600, 60Hz Pins 1 & 2 Pins 2 & 3 Pins 1 & 2 closed closed closed 800 x 600, 70Hz Pins 2 & 3 Pins 2 & 3 Pins 1 & 2 closed closed closed 1024 x 768, 43Hz Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed 1024 x 768, 60Hz Pins 1 & 2 Pins 2 & 3 Pins 2 & 3 closed closed closed 1024 x 768, 70Hz Pins 2 & 3 Pins 2 & 3 Pins 2 & 3 closed closed closed I/O BASE ADDRESS AND BASE MEMORY ADDRESS I/O Address Base Memory P33 P34 Address 300h D8000h Closed Closed 320h CC000h Open Closed 340h D0000h Closed Open 360h D4000h Open Open CPU TYPE AND SPEED CONFIGURATION CPU Type Speed P16 P17 P30 80486SX 20MHz Pins 3 & 4 Pins 3 & 5, 4 Pins 1 & 2 closed & 6 closed closed 80486SX 25MHz Open Pins 3 & 5, 4 Pins 1 & 2 & 6 closed closed 80487SX 20MHz Pins 3 & 4 Pins 3 & 5, 4 Pins 2 & 3 closed & 6 closed closed 80487SX 25MHz Open Pins 3 & 5, 4 Pins 2 & 3 & 6 closed closed 80486DX 25MHz Open Pins 3 & 5, 4 Pins 2 & 3 & 6 closed closed 80486DX 33MHz Pins 1 & 2 Pins 3 & 5, 4 Pins 2 & 3 closed & 6 closed closed 80486DX 50MHz Open Pins 1 & 3, 2 Pins 2 & 3 & 4 closed closed 80486DX2 50i MHz Open Pins 3 & 5, 4 Pins 2 & 3 & 6 closed closed 80486DX2 66i MHz Pins 1 & 2 Pins 3 & 5, 4 Pins 2 & 3 closed & 6 closed closed