Table of Contents
DM41X Snippets
Advantage Pac : Flag 21
I found that using some of the Advantage Pac programs (e.g. MATRX
or CFIT
) would lead to AVIEW
instructions in programs run subsequently to cause a HALT
- requiring use of the R/S key.
I was told via a question on the Swiss Micros Forum that this was likely to be due to the Advantage Pac setting FLAG 21
(printer active) to help in its own presentation of information on the display.
FLAG 21
SET while FLAG 55
is CLEAR (since there's no Printer Module active) causes AVIEW instructions to halt awaiting user intervention (R/S key)
To restore things to normal : either CLEAR
Flag 21 via CF
or simply turn the calculator off and on again.
See APPENDIX D in the HP41CX User Manual Volume 2 for a better explanation of the use of Flag 21 to control AVIEW
behaviour.
Extended Memory
Copy a program to Extended Memory:
- Put Prog's name in
Alpha
register - XEQ
storep
- The prog remains in main memory but can be deleted (
CLP
) if memory needed - To restore to main memory put name in
Alpha
and thenXEQ
GETSUB
DDAYS
To find the number of days between two dates
- enter 1st date into Y-stack as
dd.mmyyyy
- key in 2nd date into X-stack as
dd.mmyyyy
- XEQ ALPHA D D A Y S ALPHA
- result is the difference in days.
DDAYS
can be added to theCST
program chooser to make it easier if multiple calculations are required
Example
Days between 27/2/66 and 31/5/22
27.021966
ENTER
31.052022
XEQ ALPHA D D A Y S ALPHA
Result = 20,547
Check :
365
÷
Result 56.293
I'm 56 and a bit… sounds right…
XYZALM
Various Alarm functions
Put any message for the Alarm into the ALHPA
register
Load the stack registers with:
- Z : Repeat Interval
HHHH.MMSSs
or0
- Y : Date
DD.MMYYYY
or0
- X : Time
HH.MMSSs
Execute XYZALM
to set the alarm
When alarm goes off it is acknowledged
by pressing any key except STO
.
- Acknowledging a non-repeating (i.e.
Z
was0
) alarm cancels it. - Acknowledging a repeating alarm cancels it and re-arms it, adding the
Repeat Interval
to create the new alarm time. - Pressing STO cancels the alarm but makes it a
PAST DUE
alarm.
Example
Set alarm for 22:20, today, not repeating, called Supper
- ALPHA S U P PER ALPHA
- 0 ENTER (for Z = repeat interval)
- 0 ENTER (for Y = Date = Today)
22.20
XEQ ALPHA X Y Z A L M ALPHA
At 22:20
the alarm is activated. ALPHA
shows SUPPER
.
Alarm is cancelled by pressing any key but STO
Pressing STO creates a PAST DUE
alarm which means it gets re-triggered if the calculator is turned off. It can be cancelled and deleted by pressing any key (except STO) and then the calculator will turn off. Pressing STO will create a new Past Due alarm, and allow the calculator to turn off. On turn on the Past Due alarm will still exist and turning off will trigger it again.
A Past Due alarm is useful to remind you that something happened previously and turning the calculator off is a memory-jogger.
CATALOGUE 5
R/S
and ⇑
⇓
steps through all alarms.
To clear an alarm from the Catalogue: SHIFT
C
( where C
is √
on top row )
— John Pumford-Green 31/05/22 13:13
Page last updated: 04/08/24 21:19 BST