On Thu, 2 Jan 2003, Peter C. Wallace wrote:
> > This is one fast reader. But too fast for the 6502 me thinks.
>
> Not really if you do one several possible things:
>
>
> 1. Generate an interrupt from the index mark (can the 6522/card do this?)
Yes, it can. But I'd rather not get into interrupt programming at this
point. Maybe at a later phase when I polish this up.
> 2. Put a oneshot or flip flop on the index mark signal so its pulse can be
> seen by the 6502...
Now that can be done pretty handily with the 6522. I can switch the IM
signal to one of the control lines, which will latch the signal. Good
idea ;)
Now I'll have to get that CA1 control line working for sure, which I've
been avoiding since it still seems dodgy, even with the pull-up. I'm
already using the CA2, CB1 and CB2 lines for other signals.
Sellam Ismail Vintage Computer Festival
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Received on Thu Jan 02 2003 - 20:13:01 GMT