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1990-08-01
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Subject: IBM SDLC and Token-Ring Conflict
Date: March 28, 1988
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!! NOTE: This problem has been fixed in later releases !!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
PROBLEM: The problems we've heard of from a few customers using IBM
SDLC cards in Token-Ring workstations seems to be tied to the
fact that the SDLC card uses IRQ 3.
SOLUTION: Although there seems to be no IBM documentation to verify
this, when the TRN board is changed to either IRQ 2 or 7, we
were able to run the IBM 3270 emulation program without any
problem (with both the 1985 and the 1987 versions of
TOKREUI.COM). Visual inspection of the SDLC board by ATS
hardware experts verified that the board does use IRQ 3.
There's more on this subject. What we sent before was
somewhat of a half truth. Well, here's another quarter of
it!
There are actually two different IBM 3270 emulation boards:
"3270 Coax attached board" - connects to a 3174
"3270 SDLC remote" - connects to a SYNC modem
These are probably not exact IBM product names. It will be
important to differentiate with customers between these two
cards for a couple of reasons. Sometimes people refer to the
Coax board as an SDLC card as well. They operate
differently; the SDLC board still appears to use IRQ 3, but
it appears that the Coax board does not use any IRQ but,
rather, dual-ported memory. (We're still verifying this.)
Another item: CXI is now testing a 3rd board from IBM. It's
a combination of the other two in a MCA version. It should
be able to perform either SDLC or Coax communications.