Dive Bomber on IIe Card: Freezes on Banking, then Garbled Screen

[JDW1]

When using an Apple IIe Card running in Color Mode at 1 MHz on a Macintosh LC575 motherboard with IIe Startup 2.2.2d1, Dive Bomber loads just fine.

I then am able to choose Practice > Landing just fine.

Then game starts okay, but when I just start to bank the aircraft, it freezes...

And then a few seconds later, I get this garbled screen...

I tested the same in the Virtual ][ emulator (version 11.1 on macOS Monterey), and it does not have the freezing problem. So I must assume this freeze to be an issue that pertains only to the Apple IIe Card.

[frankmilliron]

Seems to be overwriting some screen holes. I could try a build with the acceleration code turned off to see if that helps.

[frankmilliron]

Also doesn't work on //gs. Guessing same issue?

[frankmilliron]

I tried the $7FE fix, which didn't work. Also tried removing the acceleration code completely, which also did not work.

[peterferrie]

It's trashing 4xx and 5xx, too, which will interfere with disk access. I will check on this.