Message-ID: <94@unc.UUCP>
Date: Thu, 15-Nov-84 09:57:46 EST
Article-I.D.: unc.94
Posted: Thu Nov 15 09:57:46 1984
Date-Received: Sat, 17-Nov-84 03:19:10 EST
Organization: CS Dept., U. of N. Carolina at Chapel Hill
Lines: 14


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

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"  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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