HP 42S Version Speed Variation

[J-F Garnier]

(06-09-2014 02:00 PM)Gerald H Wrote:  

(06-09-2014 01:54 PM)J-F Garnier Wrote:  Can you make sure if by chance one of your machine is in PON (Printer On) mode and this other one in POFF?

Both with same flag settings & printing is off.

Interesting.
To answer your initial question: no, such a variation between versions is not expected/common.
I checked with a simple test program on my A and C machines and got no significant differences, my C machine is even about 5-10% slower than my A, so it doesn't depend on the software version.

Maybe something is wrong in one of your machine regarding system clock, even if the self-test reports 1MHz in both cases.

If you try to do a BEEP on both machines, can you hear a significant higher pitch on one?

For your reference, here is my test program:

Code:

LBL "X"
"RUN"
AVIEW
LBL 01
+ 
GTO 01

Starting with a stack filled with 1, I get about 520 on my A machine and 490 on my C machine in 10 seconds.