Is my TI-58C hosed?

[Paul Berger (Canada)]

Have you tried removing the batteries and letting it go completely dead? Also make sure you battery holder is not shorting anything everything is exposed inside the battery compartment.

The 58C contains two RAM chips and with the default partition it should be a 50/50 split between registers and program memory, so from what you describe it would suggest that there is a problem with both of them or the problem is elsewhere. There is a scan of a service guide for the 59 available, it is the same hardware except it has 4 RAM chips and the extra circuitry for the card reader. A search "ti59 service guide" should bring up a few hits. There is also some useful information on Joerg's datamath.org site in particular a block diagram at http://datamath.org/Sci/WEDGE/JPEG_TI-59...is%20block If you need parts let me know I have a few boards from 58 and 59 that are in various states of disrepair.