[Coco] Memory Map

[Louis Ciotti]

Actually I want to be able to use lwasm, or even as09 rather than on the
CoCo.

So using lwasm the listing below does not work in XRoar with DECB 1.1 rom:

         org    $2000
begin    jmp    start
         fdb    done-begin
start    lda    #$f9
         ldx    #$400
screen   sta    ,x+
         cmpx   #$600
         bne    screen
wait     jsr    [$a000]
         beq    wait
         swi
done     equ    *
         end

This listing works, but when I press a key nothing happens (I figured it
would return to DECB when a key is pressed)

begin    jmp    start
         fdb    done-begin
start    lda     #$f9
         ldx    #$400
screen   sta    ,x+
         cmpx    #$600
         bne    screen
wait     jsr    [$a000]
         beq    wait
         swi
done     equ    *
         end

Again this is with lwasm


On Wed, May 8, 2013 at 9:00 AM, Robert Gault <robert.gault at att.net> wrote:

>
> Forget about writing programs for EDTASM DOS or standalone ZBUG. Instead
> develop your code (when possible) to run with the EDTASM embedded ZBUG.
> Look at chapter 8 in the EDTASM manual.
> The final code should be written (if possible) to work with the ROMs if
> needed or without reliance on any DOS.
>
> ORG statements are not required but can be crucial depending on the needs
> or your program. If that sounds contradictory, it is not.
> For example, let's say you want to patch parts of the COCO3 ROM. The
> easiest method would be to use multiple ORG statements so that the patches
> get loaded (LOADM) into memory at the right locations.
> With your demo program, it could be anywhere in "free" memory and still
> work, so the ORG is not necessary.
>
> Robert
>
>
>