During my wanderings on eBay I came across this 12 digit display Digitronic‑M calculator. It was an auction listing starting at $0.99 with a really low shipping cost, and the seller listed it as “works great!”. I put in a very low bid on it, not expecting to win it, but it turned out I was the only bidder. That was the good part of the transaction.
Continue reading “Digitronic‑M Calculator Repair”Eiko Unitrex 1200M Calculator Refurbishment
Another bargain price purchase of an Eico Unitrex 1200M calculator. This model also uses the same CT5005 LSI calculator on a chip IC as the APF Mark XII Calculator, but is noteworthy because of the relationship of Eico with Cal-Tex Semiconductor, Inc., the manufacture of the IC chip. The 1200M was the first calculator to use a single LSI IC with integrated memory. It also has a beautiful 12 digit Neon gas-discharge display.
