Elektronika MK-52: The MK-61 big brother?

[linuxslate.com]

Ignore part of above about the flash memory. Mine now seems fine.

Appearently, if you don't properly clear the flash before writing, it basically OR's the old data with the new data.

Also (and yes, a little geek bragging), I've owned several other (now vintage) scientific/programmable calculators over many years, including:

The Radio Shack labled version of the Sinclair Cambridge (white with purple LED display)
Commodore (I think P-50) It was brown with brown, tan, white keys and a red LED display
Radio Shack Pocket Computer 1 and 3.
HP28C and 28S.