|
Calculator chip (MOS-IC)
Mike Sebastian has a substantial amount of information regarding the integrated circuits used inside vintage calculators. You can see his website here. I have a CT5002 chip still in the package. Here's the pinout data from Mike's site, but I'd be interested in seeing full schematics for a calculator using this chip.
Cal-Tex Semiconductor, Inc. CT5002 - 12-digit calculator, 4 function _____ _____ | U | (Gnd) Vss --| 1 40 |-- Ø1 (out) (out) Ø2 --| 2 39 |-- Vdd (-6V) Clock in --| 3 38 |-- Display Inhibit Neg Sign --| 4 37 |-- g N1 --| 5 36 |-- f N1, N2, N4, N8 are number inputs N2 --| 6 35 |-- e using diode matrix keyboard N4 --| 7 34 |-- d encoding N8 --| 8 33 |-- c [CE] --| 9 32 |-- b [C] --| 10 31 |-- a [-] --| 11 30 |-- dp/overflow [x] --| 12 29 |-- P2 P1, P2 are decimal point placement [÷] --| 13 28 |-- P1 inputs for 0, 2, 3, or 4 places [+=] --| 14 27 |-- D12 [.] --| 15 26 |-- D11 D1 --| 16 25 |-- D10 D2 --| 17 24 |-- D9 D3 --| 18 23 |-- D8 D4 --| 19 22 |-- D7 D5 --| 20 21 |-- D6 |___________|
|