Service Forum

[stanley1977]

Hi. I have a T41 and a T42, both with supervisor passwords. When I open my dump file in IBMpass 2.1 Lite all I get is zeros. If I wasn't getting a good reading of the EEPROM, wouldn't I get an error in r24rf08? I have also verified that there is no POP or HDP. Passphrase is also disabled. Here's a sample of my dump:

[victor]

There could be many issues, only to mention:

1. Interface malfunction. COM port connections are wrong;
2. GND problems, the GND wire is not connected to the eeprom GND;
3. Wrong command line parameters.

etc.

1. What interface are you using? We'd like to see some pictures, including the serial port connector, etc.
_________________
Victor Voinea
ALLservice HQ, Romania.

[stanley1977]

I'm going to post some pictures. I'm using a driven i2cprog. I'm using the following command:

r24rf08 dump.bin /x /d /i

r24rf08 was giving me two errors initially, "EEPROM not available" and "Crircuit not found or bus error". I finally got it to read the EEPROM. I thought all was good, but it reads all zeros. I'll try to get pictures of my setup.

[richk]

A bad ground causes those symptoms.

[victor]

No.2 is my favourite.
_________________
Victor Voinea
ALLservice HQ, Romania.

[stanley1977]

I have it connected securely to the ground leg of the EEPROM. Is there any other than a bad connection to the EEPROM that would cause a bad ground?

[Robbyrobot]

Check to make sure you haven't shorted any of the pins to the next one, and that you always have a space between the various switches.

This:

r24rf08 dump.bin /x/d/i

will give you an "EEPROM not available" error. Put spaces between the switches and you'll get a correct readout.

[stanley1977]

Maybe I didn't make myself clear, but the "EEPROM not available" and "Circuit not found or bus error" are not my problem. I stated that I was previously having those errors, but I quickly remedied those problems.

The problem that I am having now is that my dump file reads all zeros. Everything is grounded fine. I've grounded onto the leg of the EEPROM and I also tried grounding to the chassis of the motherboard with the same results. The subject line of this thread says "solved" but it is not.

[victor]

Sorry, I presumed you solved it since you said you had a GND problem.
And I can assure you that is your problem..
If you need support please provide some more information and pictures.
_________________
Victor Voinea
ALLservice HQ, Romania.

[Robbyrobot]