HP 41 behavior

[polbit]

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 )

Could someone educate me on why that is happening?

[ThomasF]

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

[polbit]

(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

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!