Early Electronic Calculator Toshiba T4097 Module

This device contains four digit (anode) drivers for NIXIE tubes.

Period:	~ 1969/70.
Source of Data:	The pinout for this device was derived from reverse engineering of a Casio 121B, by Mick Metselaar.
Technology:	Probably potted discrete devices or a thick-film network of transistors and resistors. Note that the high-voltage isolation capacitors between the logic and these drivers, as well as the anode current limiting resistors, are external to this device.
Packaging:	Plastic module on 14-pin DIP spacing.

Package as viewed from above.