As possibly the only person to program a game in Enhanced Basic (eg with PRK module inserted), my project for the cold dark nights is to document the ADVERTISER module (1980). This could involve disassembling the GPL, and could take many happy hours... (If you do not have a disk controller the module has a power up routine in GPL to do the equivalent of CALL FILES to fence off some VDP memory...)
Meanwhile- does anyone have a photograph of a real life Advertiser module (any version!) or ANY documentation in any language - I do have the demo disk. Some of the programs on the disk contain code that produce errors on my Advertiser module binary..
The Advertiser module makes a powerful display TI basic available,
eg four short TI Basic lines can place text twice on the screen in differing fonts, play music, flash the two texts separately.... this was in 1980! Try this AFTER initialising memory:
110 CALL GRAPSET(3)
120 CALL DX2(3,3,1,11,"HELLO WORLD")
130 CALL FLASH(1,2,2,1)
140 CALL FLASH(2,1,1,2)
Lots of hours of exploration to look forward to.