Which floating-point representation did Konrad Zuse's Z1 use?
score:8
Accepted answer
There is version he rebuilt himself on display at the German Museum of Technology.
According to mrob.com, he used a base-2 system with 24 bits of data (I'm not sure why the discrepency with those who claim 22. Perhaps its an inadvertent paste from the Z3 line?) with 7 bits for the exponent and 16 for the mantissa (and presumably one bit for sign), which resulted in a range of 9.9999×10^8 .
There's a discussion of his system in detail here. That page says he actually used 14 bits for the mantissa (with of course one extra bit "implied", just like in IEEE). If this reference is right, then that may explain the discrepency. Thus the format would have been 22 bits with 14 mantissa bits (with one extra implied), a 7-bit exponent, and a sign bit.
I haven't found anything spelling out where in his data word he kept the mantissa, exponent, and sign.
More post
- 📝 How is the "Blitzkrieg" different from the "glubokaya operatsiya"
- 📝 I would like to identify the airplane in this photo
- 📝 What is the oldest building in the world still in use?
- 📝 Why was January put around 450 BC as the first month?
- 📝 How did the Soviet Union officially justify the need for foreign travel and emigration restrictions?
- 📝 How accurate is Karl Heinz Frieser when he said that the blitzkrieg was a myth?
- 📝 Liking and disliking among the Napoleonic Marshalls of the Empire
- 📝 Did the Romans install offensive statues in the temples of conquered territories?
- 📝 Does O Henry's story "Georgia's Ruling" describe history?
- 📝 Is there a quote that expresses Mill's opposition to Indian democracy?
- 📝 How was Ivaylo's Bulgarian peasant army able to repel the Mongols?
- 📝 What were the religious effects of the initial Arab conquests in the Byzantine Empire?
- 📝 Is there a difference between original 1768-71 and 1968-71 facsimile of 1st edition Encyclopaedia Brittanica
- 📝 Why did Ancient Greek religious monument (herms) have genitalia?
- 📝 Which EU countries insisted on unanimous voting for trade deals?
- 📝 Was the decrypting of communications in WW2 a one-sided effort, or did Germany also do it?
- 📝 What is the oldest road tunnel in the world?
- 📝 What are "the unconscious first steps of plant domestication" in "Guns, Germs, and Steel"?
- 📝 Why did the Ottoman Empire not industrialize like France, Germany or Belgium?
- 📝 Was there a Viking Exchange as well as a Columbian one?
- 📝 Meaning of the words "Wanted Dead Or Alive"
- 📝 What was the military equipment of a soldier of the Cholan Empire at its peak?
- 📝 Where do the ethics of shounen anime come from?
- 📝 What is the death toll attributed to US internment of Japanese-Americans during WWII?
- 📝 Was it not possible to exploit the gaps between each pre-modern melee formation?
- 📝 Who is speaking here?
- 📝 How exactly were the titles of the Roman emperors passed on to their heirs
- 📝 What were the main centres of population in South America in 1500 AD?
- 📝 What did ancient Romans use instead of shampoo?
- 📝 Are Chinese and Iranian "blocky" writing styles related?
Source: stackoverflow.com
Search Posts
Related post
- 📝 Which floating-point representation did Konrad Zuse's Z1 use?
- 📝 Why did Roosevelt and Churchill use voice-based telecommunication, instead of simpler text-based options which were easier to encrypt?
- 📝 At which point in time did the majority of German population become aware of the Holocaust?
- 📝 At which point did election in a large country become feasible?
- 📝 At what point in England did use of swords to settle impromptu arguments become unusual?
- 📝 Why exactly did telegraphs have to use "STOP" instead of a period and "QUOTE" instead of a quotation mark? (Or special codes.)
- 📝 Why did the Germans use the Enigma machine rather than the far superior "Lorenz" cipher machine?
- 📝 Why did Hitler not order the use of poison gas in combat?
- 📝 Which countries (or comparable geographical units) have a lower population now than they used to at some point in history before 1950?
- 📝 How did Medieval armies survive the use of mail armor in the deserts of the Middle East?
- 📝 Why did only the English adopt, evolve and use the longbow en masse in war?
- 📝 What pretext did Hitler use to justify Operation Barbarossa?
- 📝 When and why did the use of the lifespans of royalty to limit clauses in contracts come about?
- 📝 Did people use to marry much younger during the last millennium?
- 📝 Why did the grip-centered viking shield fall out of use relative to the kite shields?
- 📝 Which war games did Napoleon practice with his generals?
- 📝 Which cultures did *not* produce alcohol?
- 📝 When did the round house fall out of vernacular use throughout Britain and Ireland?
- 📝 Why did really old paintings use such bizarre, unnatural perspective/proportions?
- 📝 Did the Vikings use horses in battle?
- 📝 What did ancient Romans use instead of shampoo?
- 📝 When did the use of fabricated speeches in historical works go out of fashion?
- 📝 Why did Chinese use high tin bronze for swords?
- 📝 Colonisation of India: Which regions of the United Kingdom did colonial personnel come from?
- 📝 Why did so few militaries use semi automatic rifles as their standard issue infantry weapon?
- 📝 Did Vikings use of water bowls in this unhygenic way?
- 📝 What numerals did the people of Ireland use before Roman Numerals? (aka, did Ogham include numbers?)
- 📝 Did the Germans use the V1 and V2 missile system on the Eastern Front in World War 2?
- 📝 When did the use of chevrons as military rank devices begin?
- 📝 Why did Athenian philosophers praise Spartan culture and laws, which would preclude philosophers like themselves?