[Coco] Memory Map

[Fedor Steeman]

Louis,

According to my sources, the area $0600-18CE is used by Disk Basic
(however, the Disk Basic ROM itself resides at a higher address). So that
is why I start my programs from $2000 or even $1E00 to stay clear of the
first graphics page space.

You can see more on the cocopedia wiki page.

I am also writing a tutorial on just this topic, but need to get all my
facts straight first.

Cheers,
Fedor




On 8 May 2013 09:26, Fedor Steeman <petrander at gmail.com> wrote:

> Hi Louis,
>
> I am working on one here:
> http://www.cocopedia.com/wiki/index.php/Color_Computer_2_Memory_Map
>
> Any input or contributions from others appreciated! :-)
>
> Cheers,
> Fedor
>
>
>
> On 7 May 2013 19:55, Louis Ciotti <lciotti1 at gmail.com> 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.
>>
>> --
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>> Coco at maltedmedia.com
>> http://five.pairlist.net/mailman/listinfo/coco
>>
>
>