Q37628: Toggling Display Modes: 25-, 43-, and 50-Row Modes
Article: Q37628 Product(s): See article Version(s): 1.00 | 1.00 Operating System(s): MS-DOS | MS-DOS Keyword(s): ENDUSER | | mspl13_basic Last Modified: 14-NOV-1988 The following Microsoft Editor macro allows you to toggle the EGA display between 25-row mode and 43-row mode by pressing ALT+E: ;Macro to toggle 25/43 line EGA modes to23:=arg "height:23" assign to41:=arg "height:41" assign toggle23:=to23 arg "toggle41:alt+e" assign toggle41:=to41 arg "toggle23:alt+e" assign toggle41:alt+e The example below is a variation of the above macro. It allows you to toggle the VGA display between 25-row mode, 43-row mode, and 50-row mode by pressing ALT+E. Instead of switching back and forth between two modes, it cycles through all three. The macro is as follows: ;Macro to toggle 25/43/50 line VGA modes to23:=arg "height:23" assign to41:=arg "height:41" assign to48:=arg "height:48" assign toggle23:=to23 arg "toggle41:alt+e" assign toggle41:=to41 arg "toggle48:alt+e" assign toggle48:=to48 arg "toggle23:alt+e" assign toggle41:alt+e These macros should be placed in your TOOLS.INI file as described in Chapters 6 and 7 of the "Microsoft Editor User's Guide." Note: the "toggle" functions in these macros not only set the video mode, they also change the assignment of function ALT+E. This makes these macros similar to self-modifying code. For example, "toggle23" not only sets the video mode to 23-rows (with a call to "to23"), it also assigns ALT+E to "toggle41" by using the following sequence: arg "toggle41:alt+e" assign This technique is very useful in learning to write macros.
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