Konami Man wrote:
> In my system (DOS 2 installed on Mega-SCSI), #F34B points ALWAYS to
> the same
> location of #F349. If I change it, the old value is restored after
> going
> BASIC and returning. And if I change #F349, #F34B is automatically
> modified
> for equaling #F349.
>
> So, reducing #F349 and forgetting #F34B is the only method for reserve
> memory, right?
To make program that will run NOT only on your system, you must eitherallocate
memory modifying #F34B (but in this case your TSR will only work
under DOS and will probably crash after you exit from DOS to BASIC.)
or you must change BOTH #F349 and #F34B like this:
ld hl,(0f349h)
ld de,-NBYTES
add hl,de
ld (0f349h),hl
ld (0f34Bh),hl
than reload DOS (BTW, you are right - you can just load MSXDOS at 100h)
> But can I exit BASIC AFTER having executed the previous code and
> filled the
> allocated area with data, or I must do it before? If I disable
> interrupts and
> jump to BASIC by directly jumping #4022 on the disk ROM slot (that is,
> I
> don't exit DOS prompt after allocating and filling area) then I should
> not
> have problems, right?
Right. It is very difficult to understand what are you doing and in what
environment.
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