[Coco] CoCo3 PIA?

[Mark Marlette]

james,

Where did you get the dated pricing information from? :) I was being  
sarcastic on my $0.01 price reference. Where you? :)

If the LSTTL is not being used as the pull up and the 68x21 doesn't  
have configurable pullups. How does the circuit guarantee a hi level  
for the CoCo3 keyboard interface?

They also wire OR'd the joy ports in as well. Again proving that the A  
side port must be pulled hi. What am I missing?

Mark

  Quoting jdaggett at gate.net:

> On 3 Jan 2007 at 13:30, Mark Marlette wrote:
>
>>
>> I also noticed that the NAND(IC14) could be using it's inputs to pull
>> the IC5's inputs high. That way Tandy would have had to spend the
>> $0.01 on the pullup resistors. :)
>>
> ******************
>
> Back in 1985 time frame resistors would have been in the $0.03 range. I doubt
> that the input to a LSTTL device is used for pullups.
>
> james
>
>
>
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