Joypad interrupt does not fire

[pinobatch]

The Lawnmower Man for Game Boy reportedly will not start unless joypad interrupts are implemented.

To reproduce:

1. Build Peanut-GB on Xubuntu 18.04
2. Start the attached test ROM "Telling LYs?" tellinglys-0.02.zip
3. Press any button

Expect: Display advances from title screen to conversation

Actual: Title screen does not disappear

(If you do issue joypad interrupts, but you don't vary the LY when they're issued, you'll get a different error message.)

[deltabeard]

I've committed patch 298440b to the joypad_intr branch which adds joypad interrupts. As you've said, because I don't vary LY, I get the following error message in Telling LYs:

However, The Lawnmower Man still remains on a blank screen on startup with this patch. But I think that may be due to the poor timing and LCD emulation. I will have to investigate further.

I'll keep this issue open whilst I consider the "varying LY" issue with joypad interrupts.