[Coco] CoCo3 PIA?

[Mark Marlette]

Robert,

Thanks for the info. This design work is never easy..... :)

Mark

Quoting Robert Gault <robert.gault at worldnet.att.net>:

> Mark Marlette wrote:
>> Does someone know if IC5, LSC part number is a TTL or CMOS device?
>>
>> I'm working on on interface device and I need to make sure that I
>> don't have a I/O conflict.
>>
>> Since it is on the keyboard port it appears that a zero represents a
>> key press. So the A side must be inputs and the B side are the drives
>> of IC5.
>>
>> With that said then if no key is pressed(N.O. contact configuration)
>> the A side input of the PIA must be pulled high, thus indicating no key.
>>
>> This is a weird part number and I'm not exactly sure what is different
>> in this part than a 6821.
>>
>> Someone know more on this device????
>>
>> TIA,
>>
>> Mark
>>
>>
>>
>>
> IC5 is listed as LSC81001P or SILS81001P and is N-MOS. I think it is
> also a 68B22.
>
> IC4, the other PIA is also N-MOS and has many sources: MC68B21P,
> MB8874HM-G, HD68B21P.
>
> I don't have a data sheet for the MC68B22 but believe it is the same as
> the MC68B21 but with more robust outputs.
>
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