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John Garza (3665) · (This post was last modified: 10-11-2023 10:41 PM by John Garza (3665).)

(10-11-2023 04:08 PM)mbielman Wrote: Power on and display shows 0. with exponent 00 (as if you pressed SCI 0).
Press a number key (5) and the display shows -5.000000000 00
Press ENTER and it displays 5. with exponent 00

ALL functions appear to work. That is, math functions like +, -, x, SQR etc.
Roll works, STO and RCL work, PI, things like that. Display modes (DSP, FIX, etc) do NOT work. (illegal operations like divide by zero show "Error" as it should.)

This is a very different situation. I was under the impression it did not work (at all).
Thanks for giving a more detailed explanation. It does point to a RAM/ROM issue.

I am wondering if the vinegar residue being conductive caused problems when power was applied.
Shorting out traces to the chips could have damaged them.

Either way, looking at these posts, if Teenix has some CPU cards ready, that would be a cost effective approach. Plus you get some new functionality as well. Lots of space to store all the application pacs internally, and bluetooth connectivity to save/load programs to your PC among others.

-J