EGS-28/24 Spectrum

[guest11527]

I know I'm resurrecting a super-old thread here, just curious if anyone ever found any additional info on this?

Actually, pretty much everything on this is said. The GVP has the ability to generate a hardware interrupt on the vertical blank, and P96 is able to make use of it, in particular for the replacement of the WaitTOF() and WaitBOVP() functions of the graphics.library. These two functions are typically used to avoid tearing in animations, so it is good to have them.

The interrupt can be disabled/enabled from the internal API of P96 which is, unfortunately, not open.

[utri007]

Actually, pretty much everything on this is said. The GVP has the ability to generate a hardware interrupt on the vertical blank, and P96 is able to make use of it, in particular for the replacement of the WaitTOF() and WaitBOVP() functions of the graphics.library. These two functions are typically used to avoid tearing in animations, so it is good to have them.

The interrupt can be disabled/enabled from the internal API of P96 which is, unfortunately, not open.

I have GVP EGS 28/24 Spectrum it has problems with Picasso 96 and WHDLoad games. But there is no problems with WHDLoad if it used with CGX 3/4

[guest11527]

I have GVP EGS 28/24 Spectrum it has problems with Picasso 96 and WHDLoad games. But there is no problems with WHDLoad if it used with CGX 3/4

Yes, and your point is? Apparently, CGFX does not implement WaitTOF() correctly. The only way how you can get a synchronization with the top of the frame is to make use of the interrupt of the VGA chip. If the interrupt is not used and not enabled, there is obviously not a problem.