TIP: Click on subject to list as thread! ANSI
echo: aust_amiga
to: Simon Byrnand
from: Gary Laming
date: 1996-11-14 16:09:44
subject: Re: Ami - IBM Null errors.

Gidday Simon

 SB> Hmm, thats news to me. That may indeed be the correct meaning of "null
 SB> modem cable" (I dont actually know) but to me it has always meant a
 SB> cable
 SB> which crosses over RD & TD, RTS & CTS etc...what you
describe, I would
 SB> call
 SB> a "loopback plug" or "loopback cable"

Hmmm... yeah and I picked the 'null-modem' bit and skipped the
'7-wire' bit.

To illustrate what I was referring to as a null modem cable as
defined by Dick Smith Electronics...

 _______                      ________
      TD|____________________|RD
      RD|____________________|TD
     RTS|__                __|RTS
     CTS|__|              |__|CTS
     DTR|__                __|DTR
     DSR|__|              |__|DSR
      CD|__|              |__|CD
      SG|____________________|SG
 _______|                    |________

In contrast, here's what I was referring to and could well be termed a
null-modem cable.

 _______                      ________
      TD|____________________|RD
      RD|____________________|TD
     RTS|____________________|CTS
     CTS|____________________|RTS
     DTR|____________________|DSR
      CD|__               |__|CD
     DSR|__|_________________|DTR
      SG|____________________|SG
 _______|                    |________

With this arrangement you shouldn't get errors because the RTS signals
the CTS to start sending data provided that you have drop RTS on disk
writes enabled. This isn't an option on a lot of comms software and
could possibly be your problem.

Did you notice if the errors occurred during disk writes?

Regardz
Gaz

Sysop - Gaz's Grotto
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