HP29C - DSZ ISZ Question Mike T. Senior Member Posts: 282 Threads: 46 Joined: Jul 2005 03-08-2005, 05:19 PM I have never owned an HP29C (nor given the prices on e-bay am I ever likely to own one either) but would like to know if the operation of the DSZ/ISZ instructions on the HP29C/HP19C is similar to the DSE/ISG functions on the HP11C - obviously in the case of the HP29C/HP19C the test is against a zero value, but did the HP29C use the fractional and integer parts of the I register in the same was as the HP11C (and HP34C) or was it was it altogether simpler?Thanks.Mike T. Andrés C. Rodríguez (Argentina) Posting Freak Posts: 1,193 Threads: 43 Joined: Jul 2005 03-08-2005, 06:04 PM I don't have a 29/19 either, but have used a 29C for a short while many years ago. If I recall correctly (I apologize in advance if I'm wrong), as the test value was zero and as the step was always one, the fractional part is always zero´. For comparison, in the HP41 any register used for ISG/DSE operations has the format: iiiii.fffcc where i is the initial or current value, fff the final value and cc the step. Bram Member Posts: 182 Threads: 17 Joined: Oct 2005 03-09-2005, 02:54 PM Small addition: the fractional part doesn't need to be zero. It's just being ignored. Mike T. Senior Member Posts: 282 Threads: 46 Joined: Jul 2005 03-11-2005, 04:10 PM To summarize - the fractional part of the value in R0 is ignored (and left unchanged?) while integer part is incremented/decremented and next instruction is skipped if the result is zero. Please correct me if I'm wrong! Many thanks for the feedback.Mike T. Bram Member Posts: 182 Threads: 17 Joined: Oct 2005 03-14-2005, 07:16 AM fractional part is indeed left unchanged and of course the test is done on the integer part only. Mike T. Senior Member Posts: 282 Threads: 46 Joined: Jul 2005 03-14-2005, 05:37 PM Thank you... « Next Oldest | Next Newest »

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