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3.5 DiskOnChip
Address Setting
The DiskOnChip
TM
function allows the system to boot or operate
without a FDD or a HDD. DiskOnChip
TM
modules may be formatted as
drive C or A. With DiskOnChip
TM
, user may also execute DOS
commands such as FORMAT, SYS, COPY, XCOPY, DISCOPY and
DISKCOMP etc.
The U9 location onboard the HS-3000/4M is the DiskOnChip module
socket. Jumper JP11 assigns the address setting of the installed
module. Setting the 8 pins of JP11 allows you to select the starting
memory address of the DiskOnChip
TM
(D.O.C.). If you have additional
memory devices in the system, please set both at different memory
address mapping to avoid the mapping area conflicts.
JP11: DiskOnChip Address Select
JP11 Address
Short 1-2 (default) D000
Short 3-4 D800
Short 5-6 E000
Short 7-8 E800
1
2
7
8
3.6 Watchdog Timer
There are three access cycles of watchdog timer as Enable, Refresh and
Disable. The Enable cycle should proceed by READ PORT 443H. The
Disable cycle should proceed by READ PORT 043H. A continue Enable
cycle after a first Enable cycle means Refresh.
Once if the Enable cycle activity, a Refresh cycle is request before the
time-out period for restart counting the WDT Timer’s period. Otherwise, it
will assume that the program operation is abnormal when the time counting
over the period preset of WDT Timer. A System Reset signal to start again
or a NMI cycle to the CPU comes if over.
The JP9 is using for select the active function of watchdog timer in disable
the watchdog timer, or presetting the watchdog timer activity at the reset
trigger, or presetting the watchdog timer activity at the NMI trigger.