Optimizing Line Count in TI BASIC: Type-in Fun with the TI-99/4A

Thanks to a generous donation of TI-99/4A programming books from viewer Greg, we type in and try to improve upon the TI version of my favourite etch-a-sketch style program that I've been fascinated with since 1983.

Previous episodes mentioned:
TI-99/4a 40th Birthday: ​​   • TI-99/4A: 40th Birthday (Party?)  
Drawing Sketches for ZX-81:    • Re-typing My 1983 Game Programming In...  
Really Tiny Text Adventure:    • Tiny Text Adventure: From ZX81 to VIC...  

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End credit music is an excerpt of "The Second Coming" from the album "The Agony and the Ecstasy of Steve Jobs: A Soundtrack" by Bedford Level Experiment: https://bedfordlevelexperiment.bandca...

Index:
0:00 Mystery Solved: TI-99/4A Power Supply Recall
1:53 Programming book donations from Greg
2:32 COMPUTE!'s First Book of TI Games
4:59 36 Texas Instruments TI-99/4A Programs for Home, School & Office
8:41 101 Programming Tips & Tricks for the Texas Instruments TI-99/4A Home Computer
12:11 Using & Programming the TI-99/4A: Including Ready-To-Run Programs
15:57 Typing "Drawing Sketches": Lines 10-90
20:44 Lines 100-200
24:00 Lines 210-410
27:32 RUNning Drawing Sketches
29:25 GOTO Cleanup: Optimizing line count
37:30 Reducing 41 lines of code to 7: Boolean Logic
44:11 Conclusion and thanks