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--- public:calculator:guides:dm41_snippets [03/08/24 15:05 BST] – john
+++ public:calculator:guides:dm41_snippets [06/03/25 06:49 GMT] (current) – external edit 127.0.0.1
@@ Line 6: / Line 6: @@
 ==== Advantage Pac : Flag 21 ====
-I found that using any Advantage Pac program (e.g. ''MATRX'' or ''CFIT'') would lead to ''PSE'' instructions in programs run subsequently to be interpreted as ''STOP'' - requiring use of the <key>R/S</key> key.
+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 <key>R/S</key> key.
+I was told via a question on the [[https://forum.swissmicros.com/viewforum.php?f=24 | 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 (<key>R/S</key> 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.
-I was told via a question on the [[https://forum.swissmicros.com/viewforum.php?f=24 | 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'' turns ''PSE'' into ''STOP'', it appears.