ASC486

Rev. C

ASC486
SPECS
CPU i80486DX @ 33 MHz
CACHE 128 kB
RAM 4 MB SIMM
Chipset ALI M1429
CONNECTIONS
purpose location purpose location
Keyboard connector CN1 Serial port 1 CN9
Power LED & keylock CN2 Serial port 2 CN10
Floppy drive interface CN3 Speaker JP1
IDE interface LED CN4 Reset switch JP2
Parallel port CN5 IDE interface JP3
PC/104 Module connector CN6 Turbo switch JP4
Keyboard port CN7 Turbo LED JP5
USER CONFIGURABLE SETTINGS
Function Jumper Position
» Battery type select external JP11 pins 2 & 3 closed
  Battery type select internal JP11 pins 1 & 2 closed
» Clock system select double frequency JP15 & JP46 pins 1 & 2 closed
  Clock system select single frequency JP15 & JP46 pins 2 & 3 closed
» CMOS memory normal operation JP28 Open
  CMOS memory clear JP28 Closed
» Parallel port interrupt select IRQ7 JP31 pins 1 & 2 closed
  Parallel port interrupt select IRQ5 JP31 pins 2 & 3 closed
» IDE interface enabled JP32 pins 1 & 2 closed
  IDE interface disabled JP32 pins 2 & 3 closed
» Parallel port address select 378h-37Fh JP33 pins 1 & 2 closed
  Parallel port address select 278h-27Fh JP33 pins 2 & 3 closed
» Floppy drive interface enabled JP34 pins 1 & 2 closed
  Floppy drive interface disabled JP34 pins 2 & 3 closed
» Monitor type select color JP38 Closed
  Monitor type select monochrome JP38 Open
» Parallel port unidirectional JP39 Closed
  Parallel port bidirectional JP39 Open
» XT IDE interface disabled JP40 pins 2 & 3 closed
  XT IDE interface enabled JP40 pins 1 & 2 closed
» Parallel port enabled JP43 pins 1 & 2 closed
  Parallel port disabled JP43 pins 2 & 3 closed
SERIAL PORT CONFIGURATION
Port 1 (CN9) Port 2 (CN10) JP41 JP42 JP44 JP45
3F8h-3FFh 2F8h-2FFh 1 & 2 1 & 2 1 & 2 1 & 2
3F8h-3FFh Disabled 1 & 2 1 & 2 N/A 2 & 3
Disabled 2F8h-2FFh 2 & 3 N/A 1 & 2 1 & 2
3E8h-3EFh 2E8h-2EFh 1 & 2 2 & 3 2 & 3 1 & 2
3E8h-3EFh Disabled 1 & 2 2 & 3 N/A 2 & 3
Disabled 2E8h-2EFh 2 & 3 N/A 2 & 3 1 & 2
Disabled Disabled 2 & 3 N/A N/A 2 & 3
Note: Pins designated should be in the closed position.
SERIAL PORT INTERRUPT SELECT
Port 1 (CN9) Port 2 (CN10) JP29 JP30
IRQ4 IRQ3 pins 1 & 2 closed pins 2 & 3 closed
IRQ3 IRQ4 pins 2 & 3 closed pins 1 & 2 closed
DRAM CONFIGURATION
Size Bank 0 Bank 1
1MB (4) 256K x 9 NONE
2MB (4) 256K x 9 (4) 256K x 9
3MB (4) 256K x 9 (4) 256K x 9
4MB (4) 1M x 9 NONE
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
64MB (4) 16M x 9 NONE
128MB (4) 16M x 9 (4) 16M x 9
CACHE CONFIGURATION
Size Bank 0 Bank 1 TAG
32KB (4) 8K x 8 NONE (1) 16K x 4
64KB (4) 8K x 8 (4) 8K x 8 (1) 16K x 4
128KB (4) 32K x 8 NONE (1) 32K x 8
256KB (4) 32K x 8 (4) 32K x 8 (1) 32K x 8
512KB (4) 128K x 8 NONE (1) 64K x 4
1MB (4) 128K x 8 (4) 128K x 8 (1) 64K x 4
CACHE JUMPER CONFIGURATION
Size JP22
32KB Open
64KB pins 9 & 10 closed
128KB pins 7 & 8, 9 & 10 closed
256KB pins 5 & 6, 7 & 8, 9 & 10 closed
512KB pins 3 & 4, 5 & 6, 7 & 8, 9 & 10 closed
1MB pins 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10 closed
CACHE JUMPER CONFIGURATION (CON’T)
Size JP24 JP25 JP26 JP27
32KB Open Open pins 2 & 3 closed pins 1 & 2 closed
64KB Open Open pins 1 & 2 closed pins 1 & 2 closed
128KB Open pins 2 & 3 closed pins 1 & 2 closed pins 2 & 3 closed
256KB Open pins 1 & 2 closed pins 1 & 2 closed pins 2 & 3 closed
512KB pins 1 & 2 closed pins 1 & 2 closed pins 1 & 2 closed pins 2 & 3 closed
1MB pins 1 & 2 closed pins 1 & 2 closed pins 1 & 2 closed pins 2 & 3 closed
CPU TYPE CONFIGURATION
Type JP6 JP7 JP8 JP12 JP13 JP14
80486SX 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2 1 & 2
80487SX 1 & 2 1 & 2 2 & 3 1 & 2 1 & 2 1 & 2
CX486S 1 & 2 1 & 2 1 & 2 1 & 2 2 & 3 2 & 3
CX486S2 2 & 3 1 & 2 1 & 2 1 & 2 1 & 2 2 & 3
80486DX/DX2 1 & 2 1 & 2 2 & 3 1 & 2 1 & 2 1 & 2
Overdrive 2 & 3 2 & 3 2 & 3 2 & 3 1 & 2 1 & 2
Note: Pins designated should be in the closed position.
CPU TYPE CONFIGURATION (CON’T)
Type JP16 JP17 JP18 JP19 JP20 JP21
80486SX Open Open Closed Open Open Open
80487SX 1 & 2 Open Closed Open Open Closed
CX486S 3 & 4 Open Open Closed Closed Open
CX486S2 3 & 4 Closed Open Closed Closed Open
80486DX/DX2 2 & 3 Open Closed Open Open Closed
Overdrive 1 & 2 Closed Closed Open Open Closed
Note: Pins designated should be in the closed position.
CPU SPEED CONFIGURATION (EXTERNAL)
Speed JP23/1 & 2 JP23/3 & 4 JP23/5 & 6 JP23/7 & 8
25MHz Open Open Open Closed
33MHz Closed Open Open Open
40iMHz Closed Closed Closed Open
40MHz Closed Closed Open Open
50iMHz Open Closed Open Open
50MHz Open Open Closed Closed
66iMHz Closed Open Closed Open
Overdrive Open Closed Closed Open
CPU SPEED CONFIGURATION (INTERNAL)
Speed JP9 JP10
40iMHz pins 1 & 2 closed pins 2 & 3 closed
50iMHz pins 2 & 3 closed pins 2 & 3 closed
66iMHz pins 2 & 3 closed pins 1 & 2 closed
WATCH DOG TIMER SETTING
Setting JP35
Reset when WDT time out pins 1 & 2 closed
Activate NMI to CPU when WDT time out pins 2 & 3 closed
WDT disabled Open
WATCH DOG TIME OUT PERIOD
Time out period JP36 JP37
500ms pins 1 & 2 closed Closed
1 second pins 1 & 2 closed Open
2.5 seconds pins 2 & 3 closed Closed
5 seconds pins 2 & 3 closed Open