English Amiga Board - View Single Post - PTPlayer / Vertical Blank Interrupt / 060

DanielAllsopp · 31 March 2022, 21:13

Hi!

I've just tried my RoboCop build out on some real hardware to see how it's looking and I've come across the following issue: when I the ptplayer audio initialised using '_mt_install_cia' and I start playing a mod file, the scrolling completely breaks, and the blitted objects all seem to go haywire.

Example here, the first part of the video shows how the game runs without the audio initialised and playing a mod, the second part with:

[ Show youtube player ]

This was recorded on FS-UAE, but the result is exactly the same on a 060 A4000 machine. I can only guess it's some sort of PTPlayer interrupt (level 6 I think) clashing with the vertical blank interrupt I have refreshing the display (level 3 I think).

No issues with a plain A1200 setup on FS-UAE, and I'm trying to get my A1200 hardware up and running to check that but in the mean time, does anyone have any pointers as to why this might happen?

Cheers,
Daniel

31 March 2022, 21:13	#1
DanielAllsopp Registered User Join Date: Feb 2018 Location: Northumberland, UK Posts: 272	PTPlayer / Vertical Blank Interrupt / 060 Hi! I've just tried my RoboCop build out on some real hardware to see how it's looking and I've come across the following issue: when I the ptplayer audio initialised using '_mt_install_cia' and I start playing a mod file, the scrolling completely breaks, and the blitted objects all seem to go haywire. Example here, the first part of the video shows how the game runs without the audio initialised and playing a mod, the second part with: [ Show youtube player ] This was recorded on FS-UAE, but the result is exactly the same on a 060 A4000 machine. I can only guess it's some sort of PTPlayer interrupt (level 6 I think) clashing with the vertical blank interrupt I have refreshing the display (level 3 I think). No issues with a plain A1200 setup on FS-UAE, and I'm trying to get my A1200 hardware up and running to check that but in the mean time, does anyone have any pointers as to why this might happen? Cheers, Daniel