|From:||Philipp Klaus Krause <firstname.lastname@example.org>|
|Date:||Fri, 16 Jul 2021 18:31:05 +0200|
|Injection-Info:||gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="20240"; mail-complaints-to="email@example.com"|
|Keywords:||architecture, history, comment|
|Posted-Date:||16 Jul 2021 12:41:00 EDT|
>> any floating point hardware until the IBM 704 in 1954
> It is said that the Z3 (1941) was designed with floating-point.
> [I don't think the Z3 was ever built other than as a much later
> retrocomputing project. Von Neumann apparently considered floating
> point for the EDVAC and IAS machine but rejected it as too complex
> and anyway doing the scaling in software was easy, which it
> probably was if you were Von Neumann. -John]
AFAIK, the Z1 (built in 1939, working but like many early computers not
very reliable, working, destroyed 1944, working replica in a museum in
Berlin), the Z3 (built in 1941, destroyed 1943, working replica in a
museum in Hünfeld), the Z4 (built 1945, in use until 1959, original in a
museum in Munich) and the Z5 (built 1953, in use until 1958, current
whereabouts unknown, probably scrapped) all have binary floating-point.
[I've seen the replica Z1, which is entirely mechanical. I didn't realize
it used floating point. -John]
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