Re: Whatever happened to...

[vandry@CAM.ORG (Phillip Vandry)]

David.Empson@bbs.actrix.gen.nz writes:

>2. Are you changing HIMEM?  If so, don't.  If you need to protect part
>of the computer's memory from BASIC's variables, try changing LOMEM
>instead, and putting the data below that.  If you really have to change
>HIMEM, make sure you set it to a multiple of 256, and don't set it any
>higher than it is already.
>Also note that if you move HIMEM down and put any data above it,
>BASIC.SYSTEM might move it in order to allocate a file buffer (not sure
>about this).

No, just don't altogether. Chances are BASIC.System will screw you up (or
BASIC will get confused which is even worse)

There is GETBUFR and FREBUFR if you need memory in the high area. Here:

Allocate lda #numpages
         jsr $bef5
         bcs error
         sta address+1
         lda #0
         sta address
         rts
error    oops

Dealloc  lda $befb
         pha
         lda address+1
         clc
         adc #numpages
         sta $befb
         jsr $bef8
         pla
         sta $befb
         rts

Note that using this method you must deallocate buffers in the same order as
they were allocated in.
 ______________________________________________________________________
|~~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~~~~~~|
| Phillip Vandry | Vandry@Cam.Org | II the future! | II 1993!          |
|________________|________________|________________|___________________|
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~