M200 interfacing continues...

From: Sellam Ismail <foo_at_siconic.com>
Date: Thu Jan 2 20:13:01 2003

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
International Man of Intrigue and Danger http://www.vintage.org

 * Old computing resources for business and academia at www.VintageTech.com *
Received on Thu Jan 02 2003 - 20:13:01 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:35:58 BST