Questions tagged [early-computer]

Early computers and their design, from before the standards set by the IBM S/360 (of 1964) became canon.

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Why did the IBM 650 use bi-quinary?

The IBM 650, announced in 1953, was the world's first mass-produced computer. It represented numbers in decimal, which is understandable, both because it needed to work with exact money amounts, and ...
13
votes
1answer
502 views

How were Zuse Z22 Instructions Encoded?

The title says it all: How to En-/Decode Z22/Z23 Instructions? (History and Linkage: The question was raised by Wilson in a comment on my answer to his question "Why are PDP-7-style microprogrammed ...
11
votes
3answers
1k views

What is the instruction set of the Z4?

I am able to find a few instructions, such as: Fin (presumably "Fine", as in the end of a musical score, ends a program), Fin', (a conditional Fin), St (possibly "Start" -- the need for this is ...
1
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1answer
222 views

What early computers were only able to print numbers?

According to this paper (translation), one of the early soviet machines, M-1, was only able to print decimal, and not alphabetical numbers. Which other early electronic stored program computers (i.e. ...