TI Basic + sprite games

[Tursi]

I took the time to investigate this today with TI99IUC's config file -- the difference actually was due to his running in 50hz mode instead of 60hz mode. I don't know if this is a Classic99 glitch or the software actually does that when running at 50hz, but that's what the cause was.  You can toggle back and forth in the Video menu and see the problem happen and clear up... I suspect it's just because the missile and UFO are not running as far as the software expects in the time allotted when at 50hz... if you shoot a little late you'll still get the explosion, but it's further down the screen, etc.

 

 

[ti99iuc]

@Tursi many thanks for the detail  I really completely forgot about the 50hz setting.

@senior_falcon I published an article for the italian 99ers so to show also your updated results on this Sprites in TI-BASIC possibility. I also added videos of your demos and the ones from @notwhoyouthink, including files to download.     https://www.ti99iuc.it/web/index.php?pageid=homepage&artid=208

 

Also a Morphy page added with the 'Fastinit' loader update

 

 

https://www.ti99iuc.it/web/index.php?pageid=database_cerca&archivioid=343

 

 

Many thanks guys

Ciro

[mizapf]

On 2/16/2021 at 12:14 AM, Tursi said:

I suspect it's just because the missile and UFO are not running as far as the software expects in the time allotted when at 50hz... if you shoot a little late you'll still get the explosion, but it's further down the screen, etc.

This is also exactly what you see in MAME, so it is definitely a matter of 50/60 Hz. I recently tried it and wanted to post a screenshot, but this proved to be a bit difficult.

 

[tmop69]

14 hours ago, ti99iuc said:

@Tursi many thanks for the detail  I really completely forgot about the 50hz setting.

@senior_falcon I published an article for the italian 99ers so to show also your updated results on this Sprites in TI-BASIC possibility. I also added videos of your demos and the ones from @notwhoyouthink, including files to download.     https://www.ti99iuc.it/web/index.php?pageid=homepage&artid=208

 

Also a Morphy page added with the 'Fastinit' loader update

 

 

https://www.ti99iuc.it/web/index.php?pageid=database_cerca&archivioid=343

 

 

Many thanks guys

Ciro

 

 

It could be interesting to have a compiled version of Morphy (its ancestor, "Grog Maze", was really better with additional speed), however, at a first check of the code, it uses various float variables. Some should be easily replaceable, however on lines 3960-3990 are used for managing the sprites, so must be handled correctly to not impact the game.
Moreover I'm not sure that the CALL PEEKV(-753,X) to enable the sprites trick on MM is compatible with the compiled code.

 

So, a check from the various TI99 gurus ( @senior_falcon , @Tursi , etc.) is really needed... 🙂