SpectROM - Speccy emulator for the Pi co-pro

for bbc micro/electron hardware, peripherals & programming issues (NOT emulators!)
dominicbeesley
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Re: SpectROM - Speccy emulator for the Pi co-pro

Post by dominicbeesley » Fri Nov 16, 2018 11:12 pm

A quick n dirty hack might be to capture both IRQ1V and IRQ2V: at the end of your IRQ1V clear the VA1/vsync bit in the IER and then reenable it in IRQ2V that would stop the mos from considering it?

D

RobC
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Re: SpectROM - Speccy emulator for the Pi co-pro

Post by RobC » Sat Nov 17, 2018 9:26 am

dominicbeesley wrote:
Fri Nov 16, 2018 11:12 pm
A quick n dirty hack might be to capture both IRQ1V and IRQ2V: at the end of your IRQ1V clear the VA1/vsync bit in the IER and then reenable it in IRQ2V that would stop the mos from considering it?
Thanks - I hadn't thought of that. I'll see how much work it'll be to sort out the keyboard and joystick myself and think about which route to take.

RobC
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Re: SpectROM - Speccy emulator for the Pi co-pro

Post by RobC » Sun Dec 23, 2018 7:56 pm

I've done some work on the palette interrupt and Pacland now works. I've also added sound which, thanks to some detective work by hoglet, now works.

I've put a video of the CPC emulator in action here.

I've still got some bugs to iron out and I'd like to do some performance analysis on the graphics transfers but will hopefully be able to release something soon.

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