Msg: 1216 *Conference*
01-04-92 10:41:06
From: RICHARD HANSON
To : CORY HAWKINS
Subj: REPLY TO MSG #1213 (BASIC CHAINING)
Channing BASIC programs is VERY EASY !!! And, when associated with TS-DOS with the DOS-ON function--enabling TPDD access--your BASIC programs can be very large, and very modular, indeed. The trick is to use RUN"0:filename" instead of GOSUB and RETURN. Here's an example: Let's say you have a menu and two sub routines. The menu is called MENU.BA and the routines are called SUB1.BA and SUB2.BA. They would all reside on the TPDD and might look like this: 10 'MENU.BA 20 PRINT"(1) Run sub 1" 30 PRINT"(2) Run sub 2" 40 PRINT"(3) Quit" 50 INPUT"Now what";X 60 IFX="1"THENRUN"0:SUB1.BA" 70 IFX="2"THENRUN"0:SUB2.BA" 80 IFX="3"THENMENU 90 GOTO10 10 'SUB1.BA 20 ....whatever 30 ....whatever 10000 RUN"0:MENU.BA" 10 'SUB2.BA 20 ....whatever 30 ....whatever 20000 RUN"0:MENU.BA" Using the above example, you could develop specialized disks with programs on them, each altered to come back to a "calling" menu program for the sub programs on the disk. You could use a common program name for the menu, like MENU.BA, and a generic calling program in your machine, like START.BA; which would also be on each disk. Your menu program, instead of calling MENU to exit, would RUN"0:START.BA" And your START program would have two selections, i.e., RUN"0:MENU.BA" and MENU. So, you want modular? There it is! -Rick-