Like the TI-30, there's nothing but the chip, LED bar, battery clip and keyboard, so the power circuitry is on-die, like the 0980. 9 pins of the chip go to the 4x5 keyboard matrix, 16 pins go to the display, 2 pins are power and one pin is a no-connect.

Here's a really poor die shot:

It looks like the middle of the die was just copied-and-pasted from the 0970.

From, the TI-1000 also uses the 1990. Dataman and TI-45 use the 1980, which I think is just the VFD version of the 0980.

Last edited by seanriddle; 03/08/15 06:34 PM. Reason: added Datamath info