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Topic: Valid program step ignored, no error/warning (Read 1410 times) |
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RickN
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HP Calculator Enthusiast
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Posts: 45
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Valid program step ignored, no error/warning
« on: Jan 8th, 2015, 2:15pm » |
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Do these keystrokes in DEC 2-32-0000 status:
3
x<=y?
4
The real HP-16C shows "4" being entered and Ry=3. The emulator shows "34" being entered. I found this in a running program where it can lead to missing a valid step. Enter the following program:
LBL B
4
WSIZE
3
ENTER
4
x<=y?
CLx (don't care, not executed)
8
WSIZE
RTN
GSB B. On a real HP-16C this skips over the CLx step, sets WSIZE to 8, and returns with Rx=4, Ry=3. On the emulator it leaves WSIZE set to 4 and Rx=3. Single-stepping through the program on the emulator helps understand what is happening. The "8" step is ignored, apparently because "48" is an invalid value in 4-bit word size. Then the 4 that is still in Rx is used as the WSIZE argument and the stack is dropped so Rx=3.
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Jamie OConnell
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Posts: 2027
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Re: Valid program step ignored, no error/warning
« Reply #1 on: Jan 21st, 2015, 12:30pm » |
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Amazingly thorough! I will look into all of these and likely an update will follow.
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--Jamie
Music is its own reward.
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