Casio HS-3000/4M User Manual download pdf (Page 16)

3.5 DiskOnChip



Address Setting

The DiskOnChip

function allows the system to boot or operate

without a FDD or a HDD. DiskOnChip

modules may be formatted as

drive C or A. With DiskOnChip

, 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

(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

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.

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Casio HS-3000/4M User Manual Page 16