what were all of the models?
betsie/dottie, sadie, susie, mark 1, operating system known as los developed by joe templeman in leicester office of, mark 2, mark 3, mark 4, mark 5, distributor, , distributor ep
and their release dates?
unknown, 1966, 1967, 1970, ferrite core memory. from plessey or fabritek and, 1973, , , 1984, 1986, 1990(?), 1989
which model was released most recently?
distributor ep