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--- public:calculator:guides:dm41_snippets [03/08/24 15:27 BST] – [Advantage Pac : Flag 21] 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'' turns ''PSE'' into ''STOP'', it appears.
+''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)
-The easiest thing to restore things to //normal// is to turn the calculator off and on again. This clears ''Flag 21''.
+To restore things to //normal// : either ''CLEAR'' Flag 21 via ''CF'' or simply turn the calculator off and on again.
-Another way is to manually clear with ''CF''. Another, poor, way is to use the Module management to unplug and replug a module - this causes the DM41X to reset, clearing ''FLAG 21''
+See APPENDIX D in the HP41CX User Manual Volume 2 for a better explanation of the use of Flag 21 to control ''AVIEW'' behaviour.
-''Turning it OFF and ON again'' is the best option!