ACER, INC. ISA486GXi MODEL I433A Processor 80486SX/80487SX/80486DX/ODP486SX/80486DX2 Processor Speed 20/25/33/50(internal)/66(internal) Chip Set ALI Max. Onboard DRAM 32MB SRAM Cache 64/256KB BIOS Acer Dimensions 220mm x 240mm I/O Options None NPU Options None [Image] CONNECTIONS Purpose Location Purpose Location External battery JP5 Turbo LED JP16/12 & 13 Power LED & keylock JP16/1 - 5 Turbo switch JP16/15 - 17 Speaker JP16/7 - 10 Reset switch JP16/19 & 20 SRAM CONFIGURATION Size Cache TAG (U36) JP10 JP11 JP12 64KB (8) 8K x (1) 8K (1) 16K open pins 2 pins 1 & 8 x 8 x 4 & 3 2 64KB (8) 8K x (1) 8K NONE open pins 1 pins 2 & 8 x 8 & 2 3 256KB (8) 32K (1) 32K (1) 16K closed pins 2 pins 1 & x 8 x 8 x 4 & 3 2 256KB (8) 32K (1) 32K NONE closed pins 1 pins 2 & x 8 x 8 & 2 3 Note:Pins designated should be in the closed position. JP10 is closed by shorting pins 1 & 2, 3 & 4, and 5 & 6. USER CONFIGURABLE SETTINGS Function Jumper Position » CMOS memory normal operation JP6 open CMOS memory clear JP6 closed System automatically detects CPU JP7 closed type installed System detects only 486SX/DX CPUs JP7 open » Factory configured - do not alter JP8 pins 1 & 2 closed » Factory configured - do not alter JP13 pins 1 & 2 closed » Factory configured - do not alter JP17 open DRAM CONFIGURATION Size Bank 0 Bank 1 1MB (4) 256K x 9 NONE 2MB (4) 256K x 9 (4) 256K x 9 2MB (4) 512K x 9 NONE 4MB (4) 512K x 9 (4) 512K x 9 4MB (4) 1M x 9 NONE 5MB (4) 1M x 9 (4) 256K x 9 6MB (4) 512K x 9 (4) 1M x 9 8MB (4) 1M x 9 (4) 1M x 9 16MB (4) 4M x 9 NONE 17MB (4) 256K x 9 (4) 4M x 9 18MB (4) 512K x 9 (4) 4M x 9 20MB (4) 1M x 9 (4) 4M x 9 32MB (4) 4M x 9 (4) 4M x 9 CPU SPEED CONFIGURATION FOR CH9001 SYSTEM CLOCK CHIP CPU Speed JP1 JP9 20MHz pins 1 & 2 closed pins 2 & 3 closed 25MHz open pins 2 & 3 closed 33MHz pins 3 & 4 closed pins 2 & 3 closed 40MHz pins 1 & 2 and 5 & 6 pins 1 & 2 closed closed 50MHz pins 5 & 6 closed pins 1 & 2 closed CPU SPEED CONFIGURATION FOR IMISC425 SYSTEM CLOCK CHIP CPU Speed JP1 JP9 20MHz pins 1 & 2 and 3 & 4 pins 2 & 3 closed closed 25MHz pins 3 & 4 closed pins 2 & 3 closed 33MHz pins 1 & 2 closed pins 2 & 3 closed 40MHz pins 1 & 2, 3 & 4, and pins 1 & 2 closed 5 & 6 closed 50MHz pins 5 & 6 closed pins 1 & 2 closed