Changes
/* Versions */
== Versions ==
There are two versions: One that * The first one does not require a power supply input, and one that doesn'thas a switch on top.Another difference is that the original version is It does not compatible provide compatibility with CP/M, while the .* The later version one does require a power supply input and does not have a switch. Compatibility with CP/M isprovided.
The original version was first advertised in April 1985, these adverts didn't mention whether or not it requires a power supply input (normally, its data latch should need a power supply).
