Damaged Mousepointer scrolling right on LowRes Overscan OCS

PeterK · 14 October 2018, 22:12

I'm not sure if this bug is WinUAE related or exists on real OCS screens, too?

It happens on PAL LowRes screens, only with Overscan (362x283), and only with OCS (not ECS or AGA) when I move the mousepointer over the right screen border and the screen starts scrolling to the left, then the pointer gets damaged until I move it to the left border again.

Can somebody confirm that with a real OCS Amiga?

Toni Wilen · 15 October 2018, 14:43

I am not interested in swapping Agnus chips but it is almost surely caused by OCS Agnus bug where sprite's second DMA slot get disabled if following cycle is used by bitplane DMA. ECS Agnus fixed this bug (and it was not documented anywhere).

PeterK · 15 October 2018, 14:48

Thanks Toni.
If this is a real OCS chipset bug, then WinUAE is doing a perfect emulation.

Toni Wilen · 15 October 2018, 18:19

Real A1000 (ACA500plus connected to get more RAM and KS 3.1) shows identical glitch. A1000 Agnus have same bug.

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15 October 2018, 14:43	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 48 Posts: 26,092	I am not interested in swapping Agnus chips but it is almost surely caused by OCS Agnus bug where sprite's second DMA slot get disabled if following cycle is used by bitplane DMA. ECS Agnus fixed this bug (and it was not documented anywhere).

15 October 2018, 14:48	#3
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,289	Thanks Toni. If this is a real OCS chipset bug, then WinUAE is doing a perfect emulation.

15 October 2018, 18:19	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 48 Posts: 26,092	Real A1000 (ACA500plus connected to get more RAM and KS 3.1) shows identical glitch. A1000 Agnus have same bug.

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