6 replies to this topic

[BiTwhise]

I just started a new project for the AFX, a simple mulithreading thing..

Due to the nature of implementation I need som dynamic memory allocation (or as dynamic as it gets in DOS )

Since DOS allocates all free memory for my program when it loads, as heap, I need to deallocate this first

Here's the code I'm using right now

mov ax,es    ; let AX = segment of PSP base
mov bx,ss    ; and BX = segment of stack base
sub bx,ax    ; reserve seg stack - seg psp
add bx,STKSIZE/16   ; plus paragraphs of stack
mov ah,4Ah   ; fxn 4ah = modify memory
int 21h

This however, crashes DOS on the calculator :/

[huhn_m]

maybe you can't do this on the calc since romdos is not 100% compatible with ms-dos.
I contacted datalight and got a nice brochure sent to me (including the command com from romdos)
but when I requested a interrupt list or sth. usefull for a programmer they sent me
a standard reply with their 2 pdfs on describing the installation of a romdos with their SDK
and one explaining the great features and the commands (but no interrupt list.)

I requested a compatibility list ... standard answere. Since I have only a modem and am sick of downloading
these big pdf's I stopped mailing them.
Thats it.

[BiTwhise]

hmm

I think BradN did something like this in his asmtest program, but I can't find the sources anymore

--- EDIT ---
Even if rom-dos isn't 100% compatible witht ms-dos, it should at least have the basic memory management routines. And if it did not have them, it shouldn't crash when you request the use of them :/

[huhn_m]

maybe you can do this manually

ask roeoender since he has the best knowledge of the routines of DOS.
He might know a way to write to a special memory adresse to do the same the
dos function does. Do you remember his
AFXPC? there was a programm that could resize the memory (take some memory from the basic area)

[BiTwhise]

I know afxpc yea, don't have the source for it though.
Anyways, that's not reallocating memory of a currently running program.. (Allthough I have no doubt roeoender could probably help)

I tried changing the exe header instead, to force dos not to give more memory than necessary, but that didn't seem to change anything (allocation still reports largest block to 0p)

[Mohamed]

I think BradN did something like this in his asmtest program, but I can't find the sources anymore

You need that?
I have almost every peice of software done for the AFX, the oldest and very historical versions of TOUCHE, Brad's compilations, dscoshpe's beta AIPs, everything.

My CASIO folder is approximately 105 Megabytes.
I'll look for it (better dig for it) then post here if I find it.


------EDIT------

There you go: http://algebrafx2.ea...er/asmtest2.zip
With the source code.

[BiTwhise]

Ok, thanks