Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!sunybcs!mira.cs.Buffalo.EDU!Bowen
From: bowen@mira.cs.Buffalo.EDU (Devon Bowen)
Newsgroups: comp.sys.cbm
Subject: Re: 6551 (was Re: Aprotek Minimodem C)
Message-ID: <10048@eerie.acsu.Buffalo.EDU>
Date: 10 Sep 89 17:53:47 GMT
References: <2977@floenz2.UUCP> <2975@floenz2.UUCP>
Lines: 19

Distribution: world

In article <2977@floenz2.UUCP>, hugibaz@floenz2.UUCP (Ingo Kraupa) writes:
> Here is the information:
> 
> The pure cartridge contains nothing more than a ACIA 6551A, a crystal
> (1.8432 Mhz), and a MAX232.

Hmm. Has this been tested on a variety of 64's and 128's? When I tried just
these components, I had problems with 6551 timing. That's why I had to add
the 74LS74. This is on a 128. Maybe the timing for the 64 allows it to work
without the delay.

> The software uses the non-maskable-interrupt for data receive, the location
> is at $de00.

Oh well, my task requires it to be on the IRQ. I guess I'll stick with mine...

Devon