18 Oct
2011
18 Oct
'11
11:16 a.m.
From: "Chuck Guzis" <cclist at sydex.com>
Program much 1620 SPS using Monitor II?
*NOISE DIGIT n
No, that was before my time. I started on OS/360 and I didn't ever use
anything earlier than FORTRAN G and not much of that. I did use VS FORTRAN
heavily for a short while but I can't remember much about it. Then I got
out of applications and haven't been back.
CDC 6000 series machines had three sets of floating
point instructions.
Nomalized, un-normalized and "rounded". Rounded would introduce non-zero
normalization fill, which varied depending on the operation.
If you want the link to the doc on IBM's instructions (Principles Of
Operation) I'll send it to you. I took a quick look now but the floating
point is over my head. Somewhere along the line they added the IEEE binary
floating point support, but the original hex implementation had normalized
and unnormalized instructions too. I just can't remember if their FORTRAN
had protection against a useless mantissa or not, but I seem to remember it
did. I wouldn't swear to it though, I'm pretty rusty on that stuff.