This page is some collected wisdom on working with the Microchannel machines and OS/2 (TCP/IP configuration). Maybe eventually it should be split into separate pages.
After changing the hardware in a microchannel machine (e.g. barney, opie, sarah, mtpilot) you can expect to receive an error at boot. I believe the code is 00174800 but I may be off by a digit. The system will usually simply want to autoconfigure based on it's newly detected (or missing hardware) and you should simply reply 'Y' when it asks to autoconfigure. It will then reboot and you should be fine.
For some reason the autoconfigure sees fit to reconfigure devices
you've previously reocnfigured manually. On opie and barney, the
token ring cards need 32KB of ram buffer. The reconfig drops them
down to 8KB. You have to hit This is announcement that a loopback test failed on a device. If
you don't have a cable plugged into to the network card you get this.
You can just bypass it with F1.
If you try to configure the token-ring card (e.g. for TCP/IP with
LAPS) on Andy (the machine running the tap tool) you may find that tap
tool starts giving you errors about "program already loaded" and an
error message when you actually try to trace the network. Presumably
this is because there is already a device driver loaded. You have to
edit config.sys and get rid of that stuff if you want to use the
TapTool under OS/2. Alternatively, you can just use the tap tool
under DOS. The executable is, for unknown reasons, in c:/doc/tap.exe.
Error 006421
The Tap Tool quits working in OS/2
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Author: Mark Parris
Last updated: January 18, 1998