TYAN COMPUTER CORPORATION S1437 Processor 80486SX/80487SX/80486DX Processor Speed 20/25/33/50MHz Chip Set OPTI Max. Onboard DRAM 256MB Cache 64/128/256/512KB BIOS AMI/Phoenix Dimensions 309mm x 331mm I/O Options None NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location Speaker J4 Turbo LED J6 Power LED & Keylock J5 Reset switch S9 USER CONFIGURABLE SETTINGS Function Jumper Position » External BCLK buffering 486DX JP1 pins 1 & 2 (33/50MHz) closed External BCLK buffering 486SX JP1 pins 2 & 3 (20/25MHz) / 487SX closed » Snooping/Flush 20MHz CPU JP8 closed Snooping/Flush 25/33/40/50 MHz JP8 open CPU » Monitor type select monochrome JP9 open Monitor type select color JP9 closed » CPU speed select OSC/1 JP12 pins 1 & 2 closed CPU speed select OSC/2 JP12 pins 2 & 3 closed » RTC/CMOS type select JP13, JP14 & pins 1 & 2 DS1287/1287A JP15 closed RTC/CMOS type select DS1387/1488 JP13, JP14 & pins 2 & 3 JP15 closed DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 4MB (4) 1M x 9 NONE NONE NONE 8MB (4) 1M x 9 (4) 1M x 9 NONE NONE 12MB (4) 1M x 9 (4) 1M x 9 (4) 1M x 9 NONE 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 20MB (4) 1M x 9 (4) 4M x 9 NONE NONE 24MB (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 NONE 28MB (4) 1M x 9 (4) 1M x 9 (4) 4M x 9 (4) 1M x 9 32MB (4) 4M x 9 (4) 4M x 9 NONE NONE 36MB (4) 1M x 9 (4) 4M x 9 (4) 4M x 9 NONE 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 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 64MB (4) 16M x 9 NONE NONE NONE 128MB (4) 16M x 9 (4) 16M x 9 NONE NONE 192MB (4) 16M x 9 (4) 16M x 9 (4) 16M x 9 NONE 256MB (4) 16M x 9 (4) 16M x 9 (4) 16M x 9 (4) 16M x 9 CACHE CONFIGURATION Size Bank 0 Bank 1 64KB (4) 8K x 8 (4) 8K x 8 128KB (4) 32K x 8 NONE 256KB (4) 32K x 8 (4) 32K x 8 512KB (4) 128K x 8 NONE CACHE TAG CONFIGURATION Size U54 U55 U56 U71 U72 (Dirty bit) 64KB (1) 64K (1) 8K NONE (1) 64K (1) 16K x 1 or x 1 x 1 x 1 (1) 64K x 1 128KB (1) 64K (1) 8K NONE (1) 64K (1) 16K x 1 or x 1 x 1 x 1 (1) 64K x 1 256KB (1) 64K (1) 8K (1) 8K (1) 64K (1) 16K x 1 or x 1 x 1 x 1 x 1 (1) 64K x 1 512KB (1) 64K (1) 32K NONE (1) 64K (1) 64K x 1 x 1 x 1 x 1 CACHE JUMPER CONFIGURATION Size JP2 JP3 JP4 JP5 JP16 JP17 JP18 64KB 2 & Open Open Open Open Open Open 3 128KB 1 & Closed Open Open Closed Open Open 2 256KB 2 & Closed Closed Open Closed Open Closed 3 512KB 1 & Closed Closed Closed Closed Closed Closed 2 Note: Pins designated should be in the closed position. CPU TYPE CONFIGURATION Type J10 J11 80486SX pins 2 & 3 closed open 80487SX pins 1 & 2 and 3 & 4 pins 1 & 2 closed closed 80486DX pins 1 & 2 and 3 & 4 pins 2 & 3 closed closed EBC SPEED CONFIGURATION Size JP6 JP7 20MHz Open Open 25MHz Open Open 33MHz Open Closed 40MHz Closed Open 50MHz Closed Closed