On Thu, 2 Jan 2003, John Lawson wrote:
> On Thu, 2 Jan 2003, Vintage Computer Festival wrote:
>
> > I've got the PICK CHECK signal from the reader going into CB2. I have a
> > 1K resistor going from CB2 to ground.
> ^^^^^^^^^^^
> Try changing to 5K or even 10K (what I always use for pull ups/downs in
> TTL work. I think you're burying the poor PICK CHECK signal. Actually
> all the resistors oughta be 10K, IMHO.
I'll certainly try that. But I'm wondering why that should be necessary
when the 6522 data sheet says that particular pin is a TTL level output.
Sellam Ismail Vintage Computer Festival
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Received on Thu Jan 02 2003 - 13:40:01 GMT