UNITRON COMPUTER, INC. 3/486 MAINBOARD Processor 80386DX/CX486DLC/80486SX/80486DX/ODP486SX/80486DX2 Processor 25/33/40/50(internal)/50/66(internal)MHz Speed Chip Set UMC Max. Onboard 32MB DRAM SRAM Cache 32/64/128/256KB BIOS AMI/Phoenix Dimensions 230mm x 218mm I/O Options 32-bit proprietary local bus slot, 32-bit VESA local bus slot NPU Options 80387DX/CX487DLC [Image] CONNECTIONS Purpose Location Purpose Location External battery J1 Speaker J29 Turbo LED J25 Power LED & keylock J30 Reset switch J26 32-bit local bus slot S1 Turbo switch J28 32-bit VESA local bus S2 slot USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color J6 pins 2 & 3 closed Monitor type select monochrome J6 pins 1 & 2 closed » Parity enabled J9 pins 2 & 3 closed Parity disabled J9 pins 1 & 2 closed » Factory configured - do not alter J21 Open » Factory configured - do not alter J31 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 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 20MB (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 SRAM CONFIGURATION Size Cache Location TAG 32KB (8) 8K x 8 Bank 0 (1) 8K x8 64KB (8) 8K x 8 Banks 0 & 1 (1) 8K x 8 128KB (4) 32K x 8 Bank 0 (1) 8K x 8 256KB (8) 32K x 8 Banks 0 & 1 (1) 32K x 8 SRAM JUMPER CONFIGURATION Size J7 J8 J11 J12 J13 & J17 J18 J19 32KB Open pins 2 pins 1 pins 1 pins 1 pins 1 pins 1 & 3 & 2 & 2 & 2 & 2 & 2 64KB Open pins 1 pins 1 pins 2 pins 1 pins 1 pins 2 & 2 & 2 & 3 & 2 & 2 & 3 128KB pins 1 pins 2 pins 1 pins 2 pins 2 pins 1 pins 2 & 2 & 3 & 2 & 3 & 3 & 2 & 3 256KB pins 2 pins 1 pins 2 pins 2 pins 2 pins 2 pins 2 & 3 & 2 & 3 & 3 & 3 & 3 & 3 Note: Pins designated should in the closed position. . VESA MODE CONFIGURATION Mode J22 J23 J24 Master pins 1 & 2 pins 2 & 3 pins 1 & 2 closed closed closed Slave pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed Note: VESA master mode can only be enabled when IC PAL 16R4 is installed. CPU TYPE CONFIGURATION CPU Type J10 J14 J15 J16 J20 80386DX with pins 1 & N/A pins 1 & N/A N/A NPU 2 2 80386DX w/o NPU pins 1 & N/A pins 2 & N/A N/A 2 3 80486SX PQFP pins 2 & Open pins 2 & pins 2 & Open 3 3 3 80486SX PGA pins 2 & Open pins 2 & pins 2 & pins 2 & 3 3 3 3 80486SX pins 2 & pins 2 & pins 2 & pins 1 & pins 1 & 3 3 3 2 2 80486SX + 487SX pins 2 & pins 1 & pins 2 & pins 1 & pins 2 & OD 3 2 3 2, 3 & 4 3 80486SX + 486DX pins 2 & pins 1 & pins 2 & pins 1 & pins 2 & PGA 3 2 3 2, 3 & 4 3 80486DX pins 2 & pins 2 & pins 2 & pins 1 & pins 2 & 3 3 3 2, 3 & 4 3 80486DX2 pins 2 & pins 2 & pins 2 & pins 1 & pins 2 & 3 3 3 2, 3 & 4 3 CPU SPEED CONFIGURATION ICS2494 ( CPU Clock Generator) Speed J2 J3 J4 J5 25MHz pins 1 & 2 closed pins 2 & pins 2 & pins 1 & 2 3 closed 3 closed closed 33MHz pins 1 & 2 closed pins 1 & pins 2 & pins 1 & 2 2 closed 3 closed closed 40MHz pins 2 & 3 closed pins 2 & pins 1 & pins 1 & 2 3 closed 2 closed closed 50iMHz pins 1 & 2 closed pins 2 & pins 2 & pins 1 & 2 3 closed 3 closed closed 50MHz pins 2 & 3 closed pins 2 & pins 2 & pins 1 & 2 3 closed 3 closed closed 66iMHz pins 2 & 3 closed pins 1 & pins 2 & pins 1 & 2 2 closed 3 closed closed CPU SPEED CONFIGURATION IMISC425 ( CPU Clock Generator) Speed J2 J3 J4 J5 25MHz pins 2 & 3 closed pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 33MHz pins 1 & 2 closed pins 2 & 3 pins 1 & 2 pins 1 & 2 closed closed closed 40MHz pins 1 & 2 closed pins 2 & 3 pins 2 & 3 pins 2 & 3 closed closed closed 50iMHz pins 2 & 3 closed pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed 50MHz pins 2 & 3 closed pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed 66iMHz pins 1 & 2 closed pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed