Posted By
gc841
on 2013-02-08
04:51:32
|  Re: Modem and rs232
MMS, thanks for the offer of a DB25-DB9, but I found a cable in the box with my modem. As you probably guessed, I'm more of a 'plug-n-play' type than 'build-it-yourself' so if I can find a completed product, I'll go for it. If they prove to be too rare or expensive, I'll go with your suggestion.
I also looked at the individual computers website, but didn't find the suitable connector. I'll contact them. This is all appreciated, I have enough info to go forward now.
On the software side of rs232, I read recently that the plus/4 rs232 was not tested by Commodore, and there are one or more bugs.
1) According to SVS's memory map, the lines of code at $EAA7 and $EAA9 have to be swapped to allow null characters to be received.
2) In the Aug-87 issue of 'Your Commodore' (available at archive dot org), an article by RC Hemes mentions a bug (bottom of page 83). It describes how the plus/4 crashes when sending the first resume character for XON. The solution is to insert a PLA command at $EB1E. I've looked at the code but don't really understand much of this.
They sound like two different bugs to me? Are there any other known bugs for rs232?
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