On 1/15/25 09:49, Paul Koning wrote: > Yes, it certainly had that feature. I'm not sure about the limits, I thought > the integer limit was 99 digits. The reason for these options is that it's > directly supported by the hardware, which has arbitrary length integers and > (up to a limit I forgot) floating point mantissas. Given the encoding in the > hardware, it makes sense that you could mix and match; the hardware would > accept operands of whatever size you pick, in whatever combination you like. > So, for example, adding a 3 digit integer to a 300 digit integer would work > just fine.
Looked up the latest 1620 FORTRAN reference in the Monitor II-D manual. 10 and 28 for FANDK, so my memory isn't completely gone yet. Always wondered if addition and subtraction on the 1620 had a "shortstop" implementation. For example, adding a 10 digit to a 50 digit number, would the operation stop if there was no carryout after 10 digits, or would the implementation process all 50 digits? --Chuck
