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Path: utzoo!watmath!clyde!amd!jimb
From: jimb@amd.UUCP (Jim Budler)
Newsgroups: net.micro.cpm
Subject: Re: Apple II+ & MODEM7
Message-ID: <632@amd.UUCP>
Date: Sat, 24-Nov-84 12:42:53 EST
Article-I.D.: amd.632
Posted: Sat Nov 24 12:42:53 1984
Date-Received: Sun, 25-Nov-84 03:20:12 EST
References: <>
Reply-To: jimb@amd.UUCP (Jim Budler)
Organization: AMD Applications, Santa Clara, CA
Lines: 29
Summary: 

In article <> "Dana L. Smith" <smithd@unc.uucp> writes:
>
>I'm trying to use MODEM7 with an Apple II+ and an Apple Super Serial Card.  
>I've tried writing my own code to talk to the serial card but so far
>have had no success. The card works fine but sometimes locks up and won't
>receive data properly. I know I'm doing something wrong but I can't
>figure out what it is. My code is just a Z80 version of the appropriate
>6502 ROM code listed in the manual.
>
>Does anyone out there have a working overlay file for this configuration?
>
>Thanks in advance.
>
>
>smithd@unc


It may not be your code at all.  Microsoft had the 6502 perform all
I/O in the first place, rather than just switch on the Z80 and run,
due to some differences in timing between the 6502/6255 and the
Z80/6255.  You are probably running into these.  

-- 
 Jim Budler
 Advanced Micro Devices, Inc.
 (408) 982-6547
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