Analysis of information sources in references of the Wikipedia article "Model V" in English language version.
Model VI macro.
Model VI Wilkes.
[...] IBM SSEC [...] was hardly a stored program computer [...] being basically a tape-controlled machine in the tradition of the Harvard Mark I or the Bell Laboratories Model V.
The Model VI did have an ability to execute short sequences of arithmetic with single commands punched on the tape, a concept new at the time and one rediscovered and named later as "macro" commands. It interpreted these commands through ingenious electromagnetic circuits that, in effect, "microprogrammed" the machine. It is not historically misleading to use that term, since those features were seen and noticed by Maurice Wilkes (q.v.), who later developed that concept for stored program electronic computers.