[Coco] Cassette Program Loading Help Needed

Bruce W. Calkins brucewcalkins at charter.net
Mon Mar 20 09:12:50 EDT 2017

On 03/20/2017 05:05 AM, Gene Heskett wrote:
> On Monday 20 March 2017 03:02:46 RETRO Innovations wrote:
>> On 3/20/2017 1:10 AM, Barry Nelson wrote:
>>> So you need some 6809 assembly coding again eh? Something maybe to
>>> display the raw bytes being read from the cassette port? My daughter
>>> and I might be able to do something. It will take some timeā€¦
>> Yeah, I do.  I can't tell where the read code is getting messed up. As
>> I noted in a later msg, my Coco3 can't seem to laod code it saves, and
>> I have played with the audio levels quite a bit.  The same levels that
>> don't work on the Coco3 work fine on the Coco1.
>> Thanks for the suggestion to pick up a few different models.  It came
>> in handy.
>>> I would also suggest using a square wave output.
>> I think Dave is right, and square wave will work, but it has not
>> worked so far, even on the Coco 1.
>>> It uses an LTC1063 chip driven by two square wave inputs to generate
>>> a sine wave output for a wide range of input frequencies.
>> I may try it out, but due to the intended use of this solution, cost
>> needs to be very low, which translates into very low parts count.
>> Thus, I'd rather not use anything more than the ATMEGA168 and
>> passives, perhaps an odd transistor or two.
>> Jim
> Jim, this thread is tickling a very old memory. ISTR reading in one of
> the unraveled books, that one of those functions (CLOADM?) was
> incomplete in the coco3's roms.  Or maybe I read it in Kevin's brown
> book? That faint memory keeps floating to the top for some reason as I
> read this thread. It may have even been mentioned in a Rainbow. But if
> so, I haven't a clue which one.
> Cheers, Gene Heskett
Gene are you misremembering DLOAD?  That code was trashed in the CoCo 3.
Bruce W.

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