Haven’t done a tech thingy for a very long time. And I should …
The Sharp PC-1246 was released in 1984. This pocket computer had 2k of RAM and an 18k ROM. The CPU is a 4-bit CMOS affair (SC61720D03) running at 1Mhz, and had a single-line 16-character LCD text screen. Running on two CR2032 batteries it measures 135x70x10mm and weights around 95g.
It has a contrast wheel, side I/O expansion slot for peripherals such as thermal printers, external tape interface, integrated micro tape and tape recorders. It has a BASIC entry method with Exp and Log advanced functions and a continuous memory. Programming features include branching, conditions, subroutines, labels and indirect addressing.
I found this lovely working example online for a reasonable price. I did note these units don’t like cheap Poundland batteries, and was only satisfied with a couple of eye-wateringly-priced Duracell efforts running to about four pounds.