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000434_news@columbia.edu _Tue Mar 18 17:06:49 1997.msg
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From: cwr@cts.com (Will Rose)
Newsgroups: comp.protocols.kermit.misc,comp.os.cpm
Subject: Re: Back to Basics II (Blank screen in CP/M kermit)
Followup-To: comp.protocols.kermit.misc,comp.os.cpm
Date: 18 Mar 1997 22:00:41 GMT
Organization: CTS Network Services (CTSNET), San Diego, CA
Lines: 63
Message-ID: <5gn3a9$kap@bogus.cts.com>
References: <5gki33$8qi@sun.lclark.edu>
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Xref: news.columbia.edu comp.protocols.kermit.misc:6766 comp.os.cpm:18639
John Miller (miller@sun.lclark.edu) wrote:
: I have loads of experience with kermit between vaxen, macs, and PCs.
: None with my wife's Kaypro II.
: CP/M 2.2G
: Various kermits: 4.05 with adm3a, with vt52, 3.9A for Kaypro II, 4.09,
: Thanks to Don Maslin.
: I'm not satisfied completely with the RS-232 I have set up - the breakout
: box shows that some of the connections are not happy (RTS, CTS, DTR, etc),
: but for the life of me I can't figure what is wrong with them, so on to the
: empirical observation and puzzle.
: I have the serial I/O port J4 connected to a Supra 2400 B modem.
: The modem shows TX/RD activity when I connect via kermit.
: I can ATDT, log into unix and give commands, etc, and log out.
: I can't see a blasted thing on the screen.
[...]
: Is it a cable problem?
Yes. The easiest thing to do would be to get a copy of Joe Campbell's
The RS-232 Solution from the library, since it deals extensively with
the Kaypro. For debugging, get a 9V battery and a bunch of grabbers
(or whatever you call them) from Radio Shack. Then connect the battery
ground to pin 7 of the Kaypro D25, and try pulling up CTS and possibly
DSR. Once you've got it working with an external battery, then you can
probably find enough volts from eg. DTR for any necessary pullups.
Or you could try the adapter below:
With the standard RS-232 D-25 pinouts of:
1 - Frame ground
2 - TxD
3 - RxD
4 - RTS
5 - CTS
6 - DSR
7 - Signal ground
8 - DCD
20 - DTR
the cable that works in 95% of situations is:
DB-25 DB-25
1 <------> 1
2 <------> 3
3 <------> 2
4 <-+----> 8
5 <-+
6 <------> 20
7 <------> 7
8 <----+-> 4
+-> 5
20 <------> 8
Note that it is symmetrical. It is also overkill, and disables all
hardware handshaking.
Will
cwr@crash.cts.com