Re: Strange 8255 behavior

From: silverdr_at_wfmh.org.pl
Date: Wed, 13 Jun 2018 23:12:38 +0200
Message-Id: <0665FE79-E319-464C-9B62-A63AA68B8C69@wfmh.org.pl>
> On 2018-06-12, at 19:14, groepaz@gmx.net wrote:
> 
>>>>> I can't remember which versions, but at least some version of the
>>>>> CIAs can only be used as one of the two CIA's in a C64. Using it as
>>>>> the other CIA causes keyboard problems.
>>>> 
>>>> no, both can be (and are commonly) used in either position
>>> 
>>> Well, there are some revision of the CIA that only work in one
>>> position. I'll have to check the exact label of it.
>> 
>> You sure you're not talking about using a 8520, meaning a CIA meant for
>> the Amiga, in a C64?
> 
> i'm suspecting that too... and then it will only "kindof work" for some 
> programs - anything complex will likely fail due to slightly different 
> behaviour.

True - TOD is not the most widely used feature of the CIA in a 64 but at the same time not something that can be disregarded.

-- 
SD! - http://e4aws.silverdr.com/
Received on 2018-06-14 00:01:31

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