8255 chip.
Spent a lot of time mastering that as well as the UART.  

From: Chuck Macenski 
Sent: Sunday, November 11, 2018 11:51 AM
To: [email protected] 
Subject: Re: [AFMUG] OT this too

I do not. I do have some material on that topic (printer mode, bi-directional 
mode, and EPP) in a file folder somewhere.

On Sun, Nov 11, 2018 at 12:10 PM <[email protected]> wrote:

  Did you have the manual on the parallel port chip too?  

  From: Chuck Macenski 
  Sent: Sunday, November 11, 2018 11:03 AM
  To: [email protected] 
  Subject: Re: [AFMUG] OT this too




  On Sun, Nov 11, 2018 at 11:57 AM Chuck Macenski <[email protected]> wrote:

    I'll store it for you :)

    On Sat, Nov 10, 2018 at 6:00 PM Mathew Howard <[email protected]> wrote:

      never know when you might need that...

      On Sat, Nov 10, 2018 at 11:51 AM Ken Hohhof <[email protected]> wrote:

        Let it go .... let it go ....

        -----Original Message-----
        From: AF <[email protected]> On Behalf Of Chuck McCown
        Sent: Saturday, November 10, 2018 10:56 AM
        To: [email protected]
        Subject: [AFMUG] OT this too






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