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PostPosted: Tue Sep 24, 2013 6:26 pm 
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Joined: Tue Sep 24, 2013 6:04 pm
Posts: 1
Hello

i have problem why my MC68K cannot interface to Rs232 and cannot use Hyperterminal
i use MC68681 and MAX232
please help me find how to Fix this Problem ...


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PostPosted: Thu Sep 26, 2013 9:41 pm 
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Joined: Thu Dec 16, 2004 6:42 pm
Posts: 1039
Have you tried to connect to it with EASy68K and the Dumbterm program?
http://www.easy68k.com/examples/dumbterm.zip

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Prof. Kelly


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PostPosted: Fri Nov 08, 2013 9:39 pm 
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Joined: Mon Jul 26, 2010 11:43 pm
Posts: 198
Location: Aurora, IL
RS232 interfacing can be difficult.

Make sure you know the RX and TX pins on your connectors. Use a scope, check it, and confirm baud rates. Ideally have code that can send a continuous stream of characters. 'U' being a particularly good pattern.

Know your cables, understand the connectors on both ends, if the cable is straight-through, or cross-over. Understand if your gender-changer or null-modem adapters is straight-through, or cross-over.

Check if you need flow control (CTS/RTS or DTR/DSR) at either end.

In the late 80's we had a device called an Interfaker that allow signals to be probed and patched, because every manufacturer had their own connectors, quirks, and implementations of serial interfaces.


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