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HP 41 behavior
03-18-2023, 01:13 PM
Post: #1
HP 41 behavior
I am very new to 41-series. Have been playing with programming a lot, but today I just did a simple loop that shows an increasing number, and don’t understand the behavior:

Code:

LBL “TEST”
0.020
LBL 01
CLA
“X=“
ARCL X
AVIEW
ISG X
GTO 01
END

This shows X 1 though 8 or so quickly, then slows down to a crawl - about 2 seconds between showing the next number. Same behavior if I just switch the Alpha section to a simple VIEW X. If I don’t show the number, it is of course very fast (well, relatively speaking Smile )

Could someone educate me on why that is happening?
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03-18-2023, 03:03 PM
Post: #2
RE: HP 41 behavior
Hi,

Do you use a normal HP41, or something else? Like DM41X or simulator?
Or do you have something connected to the 41, like HPIL or printer?

I just tried on my HP41CX and I don't see the behavior you describe.
Executing "TEST" shows (as expected when the calculator is in FIX 4 mode):

Code:
X=0,0200 (½sec pause)
X=1,0200 (½sec pause)
X=2,0200 (½sec pause)
...
X=20,0200
All pauses are the same, and the execution stops when X reaches 20.

If a printer is attached (or IR module), this might explain the behavior, since after the printer-buffer is full the execution slows down to be able to print, but there is room for ~8 lines.
I don't have a printer for my 41 to test with, but I have seen similar delays when printing a program on the DM41X (using the normal printer ROM and IR). The first ~8 lines goes very quickly, but after that is slows down quite noticable.

Cheers,
Thomas

[35/45/55/65/67/97/80 21/25/29C 31E/32E/33E|C/34C/38E 41C|CV|CX 71B 10C/11C/12C/15C|CE/16C 32S|SII/42S 28C|S 48GX/49G/50G 35S 41X]
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03-18-2023, 03:54 PM
Post: #3
RE: HP 41 behavior
(03-18-2023 03:03 PM)ThomasF Wrote:  Hi,

Do you use a normal HP41, or something else? Like DM41X or simulator?
Or do you have something connected to the 41, like HPIL or printer?
...
Cheers,
Thomas

Ah, mistery solved, thank you Smile

I am using DM41X right now as I'm on vacation and didn't want to bring a real 41. Didn't even think about it being and issue with the print buffer! Disabled thermal printer module and all is behaving as expected!
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