IBM Ethernet II 10Base2 Credit Card Adapter

Last Updated: 11th February, 1995

Symptoms

Installation aid fails to recognise presence of Card Services and Resource Map Utility that OS/2 Warp has installed.

Traps during boot of OS/2 Warp when MAM is attached to card.

Exception in device driver: PCMCIA$
TRAP 000d       ERRCD=0183  ERACC=10f3  ERLIM=000001ff
EAX=00000000  EBX=fffff000  ECX=05800111  EDX=fdf00000
ESI=fdf0042e  EDI=abcb014f  EBP=00004e7e  FLG=00010216
CS:EIP=0580:0000144e  CSACC=009b  CSLIM=00002cbd
SS:ESP=0030:00004e7e  SSACC=1097  SSLIM=00003fff
DS=0650  DSACC=0093  DSLIM=0000044f  CR0=8001001b
ES=0a48  ESACC=0093  ESLIM=00000464  CR2=fff0701b
FS=03b8  FSACC=00f3  FSLIM=00000023
GS=0000  GSACC=****  GSLIM=********

The system detected an internal processing error at
location ##0160:fff5c34c - 000d:a34c
60000, 9084

048600b4
Internal Revision 8.162, 94/09/19

The system is stopped. Record all of the above information and
contact your service representative.

Hardware

IBM ThinkPad 75x
IBM Ethernet II 10Base2 Credit Card Adapter (PN 0934315)

Software

IBM Credit Card Ethernet II Adapter Installation Diskette (v2.03)
IBM OS/2 Warp V3.0

    Card Services (supplied with Warp)
       5-10-94  22:56      41158           0  PCMCIA.SYS
      23-09-94   5:41       1120          49  VPCMCIA.SYS
      15-06-94  18:01       2493           0  AUTODRV2.INI
       5-10-94  22:56      10862           0  AUTODRV2.SYS

    Socket Services (supplied with Warp)
       5-10-94  23:02      12861           0  IBM2SS01.SYS

Problem

Both symptoms result from using the Card and Socket Services drivers that are supplied with Warp. These drivers are not compatible with the Ethernet card &/or its drivers.

Procedure

Install the latest Card and Socket Services from IBM:

Fetch UTTPS200.EXE from the IBM PC Company's FTP server:
```
   
```
ftp://ftp.pcco.ibm.com/pub/mobiles/
Run the self extracting zip
Make the 2nd disk:
```
LOADDSKF UTTP20-2.DSK A:
```
Run the installation program PCMINST2.EXE

Check that similar lines to the following are at or near the bottom of CONFIG.SYS.

DEVICE=\THINKPAD\PCMCIA.SYS
DEVICE=\THINKPAD\VPCMCIA.SYS
DEVICE=\THINKPAD\AUTODRV2.SYS \THINKPAD\AUTODRV2.INI
DEVICE=\THINKPAD\IBM2SS01.SYS /C1=9

Notes

Aside from the problems above, I also experienced failure of the loopback diagnostic test. The manual that accompanies the card suggests replacing the card. I did this and experienced the same problem. It turned out that the problem was actually a dud 50 ohm terminator (not supplied by IBM). When I replaced the 50 ohm terminator, the loopback test passed.

So, if the loopback diagnostics fail for you, check your T-connectors and terminators. If you have spares handy, try them. If you don't, use a multimeter to check the resistance between the core and the case of the T-connector when both the terminators are attached to it. A good set of terminators and T-connector will measure 25 ohms (e.g. half of 50 ohms). If it measures 50 ohms, either the T-connector, or one of the terminators needs to be replaced.

Finally, people new to Ethernet cabling (such as myself!) may not realise that the following cabling configuration for a 2 machine network is incorrect, even though it makes sense "geometrically".

WRONG:

        F---- Coax Cable ----F
        |                    |
        M                    M
      Card                  Card
      
      Where:
      
        M - male coax connector
        F - female coax connector

T-connectors must be used. The reason is that a thin coax cable needs a 50 ohm load on each end. This can only be achieved if T-connectors are used.

RIGHT:

     T M+M F---- Coax Cable ----F M+M T
        F                          F
        |                          |
        M                          M
      Card                        Card
     
     Where:
     
        M   - male coax connector
        F   - female coax connector
        T   - 50 ohm terminator

       M+M  - T-connector
        F

jon seymour (jon@zeta.org.au)

The Warp Pharmacy