10 STC89C52s that I bought for under a dollar each have finally arrived after braving the stormy seas, well empty skies, of this COVID-19 era. I put them on the dev board and tested with the usual blinky program. They didn't require the newer 7.2C download protocol in stcgal like the one that came with the board, so they were old stock. I'll be using the dev board to check my firmware for future projects, and I'll mark this project completed.