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PANAMATIK · (This post was last modified: 03-11-2015 11:42 AM by PANAMATIK.)

(03-10-2015 10:42 PM)Marcus von Cube Wrote:
(03-10-2015 03:53 PM)PANAMATIK Wrote: And the number of permutations for the order of the three chips is only three factorial 3!=6. I will try that.

They might work in any order if they are all wired in parallel and decode their addresses themselves.

You are right! I should have known it by myself. I made the experiment with a working 31E, which has two chips and I interchanged them. It worked in both positions.

Then I tried to repair the HP-33E. I "dremel"d the defective chip and soldered a wire to the board but without success.

Then I exchanged components from the 31E to 33E and back to find the defective part. It was indeed the (I assume RAM) chip 00031 A0008SGP. I replaced it by 00031 B0008SGP from 31E and my HP-33E works completely!

But I need another 0031 A0008SGP for the HP-31E now.

Thanks for your suggestions.

Bernhard