Early Electronic Calculator Toshiba T1191 Integrated Circuit

This IC is keyboard numeral encoder.

Period:	~ 1969/70.
Source of Data:	The pinout for this device was derived from reverse engineering of a Casio 121B, by Mick Metselaar.
Technology:	Used in a calculator based on JMOS ICs, but this is probably just a network of diodes.
Supply Voltage:	A single connection to -24V.
Packaging:	Standard 14-pin DIP.

IC package as viewed from above.