On Tue, 26 Dec 2023, Jim Hall via Freedos-devel wrote:
I actually never learned DOS assembly programming, but decided I'd
like to start.
What assembler do you recommend, and where is a good place to start
learning about DOS assembly programming? Start with a "Hello world"
program and eventually move up to writing an assembly version of TYPE
and CHOICE, things like that.
I was thinking about NASM, since it's open source and we include it in
the distribution. Looking around, I found a bunch of tutorials on
https://asmtutor.com/ that look easy enough to follow, although it's
for Linux. Any similar tutorials to learn DOS assembly programming?
I've used NASM because it's easier than the traditional x86 assemblers. A
simple .COM might look like this:
cpu 8086
org 0x0100
entry: mov dx, msg
mov ah, 0x09 ; PUTSTR
int 0x21
mov ax, 0x4C00
int 0x21 ; EXIT CODE 0
msg: db "Hello, cruel world.", 13, 10, "$"
My own implementation of CHOICE is actually written in NASM - it's one of
the programs I wrote to learn x86 ASM (and it reads a lot like I was
thinking in 6502).
-uso.
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