[Coco] Memory Map

[Louis Ciotti]

Thanks for the tip.  The manual only talks about changing the org statement
when using it with zbug standalone.

So I can assume that the ORG statement is not a "requirement" when writing
an assembly program.

On Wed, May 8, 2013 at 1:12 AM, Robert Gault <robert.gault at att.net> wrote:

> Louis Ciotti wrote:
>
>> Where can I get a memory map of the CoCo?
>>
>> In my initial attempt at assembly programing I first used Disk EDTASM in
>> XRoar, and programed the example in the Disk EDTASM manual and it produced
>> a checker board pattern on the screen like the manual said it should.  I
>> then tried using lwasm, and as09 and it did not work.  I tracked the
>> problem to the "ORG $1200" statement.  If I remove that line the
>> program runs in XRoar as it should if assembled with lwasm, but not as09.
>>
>> Here is the program (Hopefully this looks ok, need a monospaced font):
>>
>>         org     $1200
>> begin  jmp     start
>>         fdb     done-begin
>> start  lda     #$f9
>>         ldx     #$400
>> screen sta     ,x+
>>         cmpx    #$600
>>         bne     screen
>> wait   jsr     [$a000]
>>         beq     wait
>>         clr     $71
>>         jmp     [$fffe]
>> done   equ     *
>>         end
>>
>> The Disk TASM manual states that $1200 is used as the starting address
>> because the "DOS" program for Disk EDTASM occupies from $0600 - $11FF.
>>  Now
>> if I use lwasm I of course do not have DOS in memory so $0600-$11FF is
>> empty.
>>
>>
> Louis,
> I can see that you used the test program from the EDTASM user's manual. I
> suggest that you change it so that you can run it directly from EDTASM as
> explained in the manual.
> Remove the org $1200 and replace the
>      CLR
>      JMP [$FFFE]
> with
>      SWI
>
> Then you just assemble the program in memory and let EDTASM decide where
> to place it.
> A/IM
> Then enter
> Z
> G BEGIN
>
> By the way, stock EDTASM does not like lower case.
>
>
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