SWUtils (SimCheck, SimTest, OSDump)

[Panther]

Time to revisit GTIA/CTIA detection again!  The timings seem to change easily, I'll need to figure out a more reliable method.

 

[+Stephen]

5 hours ago, Panther said:

Time to revisit GTIA/CTIA detection again!  The timings seem to change easily, I'll need to figure out a more reliable method.

I seem to recall there's a way using a specific PMG collision register - and it may involve checking results with the GTIA register on & off.  Similar to how in BASIC you can type POKE 623,64 and the screen should go black if you have a GITA, but it stays blue if you have a CTIA.

[Panther]

4 minutes ago, Stephen said:

I seem to recall there's a way using a specific PMG collision register - and it may involve checking results with the GTIA register on & off.  Similar to how in BASIC you can type POKE 623,64 and the screen should go black if you have a GITA, but it stays blue if you have a CTIA.

That's actually how I'm doing it.  Set the player 0 horizontal position, graphics mode 9, GPRIOR loaded with #$41, clear the collision registers, wait two jiffies, load each player and missile register with 0, and check for a player 0 vs. playfield collision.  It usually works.

 

[+Stephen]

4 minutes ago, Panther said:

That's actually how I'm doing it.  Set the player 0 horizontal position, graphics mode 9, GPRIOR loaded with #$41, clear the collision registers, wait two jiffies, load each player and missile register with 0, and check for a player 0 vs. playfield collision.  It usually works.

 

Ah - sorry, that was my best idea.

[Panther]

7 minutes ago, Stephen said:

Ah - sorry, that was my best idea.

I appreciate the help anyway.  The first method I tried when I first wrote SimCheck didn't work well at all!  I'm sure this will work, but just needs some tweaks.