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 long did it take to make a 16th century arrow?
- 📝 How did thieves get into Egyptian pyramids?
- 📝 Why weren't aircraft carriers utilized during D-day?
- 📝 DNA results of Amarna dead?
- 📝 Were people of Third Estate rich?
- 📝 Why is the Ping Yuen river in Hong Kong called River Ganges?
- 📝 Earliest evidence of objects intended for future archaeologists?
- 📝 Were there any drunk driving laws before the automobile?
- 📝 Did Soviet Union have the requirement that people submit yearly tax returns?
- 📝 What is the average (or default if you prefer) human political system?
- 📝 When did we discover air?
- 📝 How did CGP Grey get his hands on old New York Times papers?
- 📝 Did civilian cold war bunkers plan for inclusion of family pets?
- 📝 Incentive to ban women having more than one husband?
- 📝 Why are there laws that are used to limit how long a house can be in a family?
- 📝 What Roman legions were present in London (UK)?
- 📝 Why bother to attack in trench warfare?
- 📝 Under primogenture in 12th century France, if the eldest son predeceases his father, did the grandson or an younger son inherit?
- 📝 How influential was the Jewish boycott against Nazi Germany?
- 📝 Were regular citizens of the Republic of Venice permitted to own and carry arms/weapons?
- 📝 Are there historical examples of civilization reaction to learning about impending doom?
- 📝 What was the condition of women in "primitive societies" around the world?
- 📝 Why was Eisenhower chosen to be Supreme Allied Commander in Europe?
- 📝 How was real estate from Germans expelled after WWII redistributed?
- 📝 What was the first printed material owned and kept in Kamchatka?
- 📝 Could freedmen join the army in ancient Rome?
- 📝 What is the manifestation of the Holy Roman Emperor reign in Italy?
- 📝 Who was the VP during these Civil Rights milestones?
- 📝 Anti militarism
- 📝 What is a difference between the revolution in Egypt that sprung recently and the Russian Revolution of 1917
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?
