Re: Strange 8255 behavior

From: Francesco Messineo <francesco.messineo_at_gmail.com>
Date: Wed, 13 Jun 2018 23:27:54 +0200
Message-ID: <CAESs-_xzkZfRiAQQ8KVQwW4kmwL4eQs0dW6MvJAh6vkHDuGEOw@mail.gmail.com>
On Wed, Jun 13, 2018 at 11:20 PM,  <silverdr@wfmh.org.pl> wrote:
>
>> On 2018-06-13, at 22:56, Francesco Messineo <francesco.messineo@gmail.com> wrote:
>>
>>>> probably the best thing would be re-creating a clone of the 6525 in a
>>>> MAX7000 (5V series) CPLD. I can help (but I haven't a lot of spare
>>>> time) if anyone likes doing that.
>>>
>>> I am still waiting for someone to reimplement the 6526 replacement, which probably is in higher demand...
>>
>> well, yes, I could try that indeed. I have the impression though that
>> the 6526 isn't among the most scarce ICs. I was thinking just today to
>> attempt to design a CPLD adapter to use a 6502 in place of the
>> 7501/8501. Having a nice C16 without a working CPU annoys me and the
>> 7501/8501 prices are outrageous.
>
> By the time you finish the 7501, your TED will go belly up and you'll have next nice project on your desk :-)

well, I have repaired a few computers from the 264 family, I've never
found a faulty TED, but I know they tend to die too.
The CPUs die more often. My C16's TED is still working fine (I can
test it whenever I get a suitable cousin to be repaired).

It seems to me the 7501 isn't difficult to design around a 6502, if it
only was more "documented".

F
Received on 2018-06-14 00:02:11

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