TI Programmer

I think the TI-30 was one of the 'recomended' calcualtors when I was at school, the other being a Casio something (FX39?). I certainly rememebr a TI scientific machine which ran off a 9V battery and whch could take a rechgeable pack that contained a step-up converter board. I rebuilt a few of those... I also rememebr the Casio rechargeable battery pack, which was a pair of AA NiCd cells in a plastic carrier. The carrier had a peg on it that operated a leaf switch in the calcualtor so that the AC adapter could charge them (with the switch open, the calculator would run off the AC adapter, but the battery was totally disconnected with the adapter was plugged in -- what you want for primary cells). I never had either of those calculators. I could never get my head around a calculator with an '=' key. I had my trusty 41CV... -tony