SEE-THRU DATA SYSTEMS, LTD. STO98C Processor 80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2 Processor Speed 20/25/33/40/50(internal)/50/66(internal) Chip Set OPTI Max. Onboard DRAM 32MB SRAM Cache 64/128/256KB BIOS MR Dimensions 220mm x 220mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery J9 Turbo switch JP12 Power LED & keylock J18 Turbo LED JP13 Speaker JP11 Reset switch S1 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select monochrome JP1 open Monitor type select color JP1 closed » CMOS memory normal operation JP2 pins 2 & 3 closed CMOS memory clear JP2 pins 1 & 2 closed SRAM CONFIGURATION Size Cache Location TAG (U31) TAG (U32) Dirty Bit (U42) 64KB (8) 8K x Banks 0 & 1 NONE (1) 8K x (1) 16K x 4 8 8 128KB (4) 32K Bank 0 NONE (1) 8K x (1) 16K x 4 x 8 8 128KB (4) 32K Bank 0 NONE (1) 32K x (1) 16K x 4 x 8 8 256KB (8) 32K Banks 0 & 1 NONE (1) 32K x (1) 16K x 4 x 8 8 256KB (8) 32K Banks 0 & 1 (1) 8K x (1) 8K x (1) 16K x 4 x 8 8 8 SRAM JUMPER CONFIGURATION Size JP3 JP4 JP7 JP8 64KB pins 2 & 3 pins 2 & 3 open open closed closed 128KB pins 1 & 2 pins 1 & 2 closed open closed closed 128KB pins 1 & 2 pins 1 & 2 closed open closed closed 256KB pins 2 & 3 pins 2 & 3 closed open closed closed 256KB 1 pins 2 & 3 pins 2 & 3 open closed closed closed Note 1 :Jumpers are in this position only when using (2) 8K x 8 in TAG sockets U31 & U32. 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) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 Note:8 or 9-bit SIMMs can be used. CPU SPEED CONFIGURATION Speed JF0 JF1 JP6 JP10 20MHz closed closed pins 2 & 3 open closed 25MHz open closed pins 2 & 3 open closed 33MHz(386/486DLC) closed open pins 2 & 3 pins 1 & 2 closed closed 33MHz(486) closed open pins 2 & 3 open closed 40MHz open open pins 2 & 3 pins 1 & 2 closed closed 50MHz (internal) open closed pins 2 & 3 open closed 50MHz open closed pins 1 & 2 pins 2 & 3 closed closed 66MHz (internal) closed open pins 2 & 3 open closed CPU TYPE CONFIGURATION Type JP5 JP9 JP14 JP15 JP16 JP17 80386DX 1 & 2, 1 & 2, 1 & 2 1 & 2 2 & 3, closed 3 & 4 3 & 4 4 & 5 CX486DLC 1 & 2, 1 & 2, 1 & 2 1 & 2 2 & 3, closed 3 & 4 3 & 4 4 & 5 80486SX 2 & 3 open 1 & 2 2 & 3 2 & 3, open 4 & 5 80487SX 1 & 2, 2 & 3 2 & 3 2 & 3 2 & 3, open 3 & 4 4 & 5 80486DX 1 & 2, 1 & 2 2 & 3 2 & 3 2 & 3, open 3 & 4 4 & 5 80486DX2 1 & 2, 1 & 2 2 & 3 2 & 3 2 & 3, open 3 & 4 4 & 5 Note:The location of JP15 is unknown. Pins designated should be in the closed position