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+--- Thread: 67 ISZ (/thread-15344.html)
67 ISZ - teenix - 07-14-2020 06:30 AM
Hi all,
Just playing around with the 67 emulator.
Does the ISZ function actually get a chance to skip on zero or is in only good for a counter?
Example: I = 9.999999999 E99 then do ISZ
I doesn't wrap around to 0 on overflow so still equals 9.9999999999 E99 and therefore a skip never executes.
cheers
Tony
RE: 67 ISZ - Werner - 07-14-2020 06:59 AM
9.999999999 E99 + 1 doesn't overflow of course.
Werner
RE: 67 ISZ - ijabbott - 07-14-2020 07:46 AM
Are you ignoring negative values of I?
RE: 67 ISZ - teenix - 07-14-2020 10:05 AM
(07-14-2020 07:46 AM)ijabbott Wrote: Are you ignoring negative values of I?
I didn't think of that, negative I values used for ISZ can result in I = 0, but seems not positive numbers.
cheers
Tony
RE: 67 ISZ - Paul Dale - 07-14-2020 12:46 PM
I think the 67's ISZ/DSZ also have interesting behaviour for fractional values. From memory skipping if -1 < I < 1.
ISZ/DSZ were not present on the proposed 67+.
Pauli
RE: 67 ISZ - Paul Berger (Canada) - 07-14-2020 01:48 PM
(07-14-2020 12:46 PM)Paul Dale Wrote: I think the 67's ISZ/DSZ also have interesting behaviour for fractional values. From memory skipping if -1 < I < 1.
ISZ/DSZ were not present on the proposed 67+.
Pauli
The manual states "For test purposes, numbers between but not including -1 and +1 are the same as zero."
Paul.
RE: 67 ISZ - teenix - 07-15-2020 12:02 AM
(07-14-2020 01:48 PM)Paul Berger (Canada) Wrote:(07-14-2020 12:46 PM)Paul Dale Wrote: I think the 67's ISZ/DSZ also have interesting behaviour for fractional values. From memory skipping if -1 < I < 1.
ISZ/DSZ were not present on the proposed 67+.
Pauli
The manual states "For test purposes, numbers between but not including -1 and +1 are the same as zero."
Paul.
Only the integer part of the number is used, so 0.99 or -0.99 = 0
cheers
Tony
RE: 67 ISZ - Paul Dale - 07-15-2020 04:52 AM
Exactly, this is quite different to ISG and DSE.
The 34S supports all flavours of course.
Pauli
RE: 67 ISZ - teenix - 07-15-2020 08:50 AM
(07-15-2020 04:52 AM)Paul Dale Wrote: Exactly, this is quite different to ISG and DSE.
The 34S supports all flavours of course.
Pauli
I may be missing something but, I wonder why the comparison is between a 5 digit number and a 3 digit number, ie, is 12345 > 123. I would have thought it would seem more logical to have used two 3 digit numbers.
cheers
Tony
RE: 67 ISZ - Paul Dale - 07-15-2020 10:36 AM
The larger range is useful for DSE.
For ISG, it seems less so.
Pauli