11
(*) : default setting
2.5 Upgrade the External Cache
The PSC-586VGA designed pipelined burst Cache RAM
slot to accept 256KB,512KB,1MB Cache RAM module.
The slot is U3. When you install the Cache RAM module,
please try to test it before you buy it. Because some Cache
RAM module‘s quality and performance is no good,will possible
have compatible problem. And please set the cache
RAM module to Async. or Sync. jumper setting correctly.
Cache Type
JP1
JP2
Async. Cache
1-2
OPEN
* Sync. Cache
2-3
CLOSE
(*) default setting
2.6 System Memory DRAM(EDO RAM supported)
There are four 72-pin SIMM sockets to accept
1MB,2MB,4MB,8MB,16MB,or 32MB memory modules.
The total capacity is from 2MB to 128MB
.
Customers have to install
at least 2pcs RAM module on board
,
SIMM Socket 1,2 or 3,4.
From left side to right side,the SIMM sockets are
SIMM 1,
SIMM 3,SIMM 2,SIMM 4.
2.7 Watch-Dog Timer
The Watch-Dog Timer is enabled by reading port 443H. It should be
triggered before the time-out period ends, otherwise it will assume the
program operation is abnormal and will issue a reset signal to start
again, or activate NMI to CPU. The Watch-Dog Timer is disable by
reading port 043H.
•
JP13 : Watch-Dog Active Type Setting
JP13
DESCRIPTION
* 1-2
RESET WHEN WDT TIME-OUT