Recent content by Arbee

Also worth noting: all of the Quadras except the AVs and 630 have mostly-compatible video and use the same driver, and that makes corner case bugs more likely. The Q700/900 ROM programs the wrong VRAM base and vertical resolution if the 512x384 monitor is connected. The Q800 and later ROMs...

It actually was nothing complicated, just an oversight in MAME's 680x0 differentiation.

Yeah. I had a similar problem with the '030 and it turned out that Apple was checking the internal details of the 680x0 coprocessor interface (there are coprocessor interface registers in the CPU address space). The coprocessor interface doesn't exist on the '040 so it's not that. The...

The CRT usually isn't the problem on TVs/monitors of that age. Bad caps seems much more likely.

Yes, it's known. Throwing an F-line trap on FPU instructions for the '040 gives a sad Mac error and I haven't investigated why that is so MAME always emulates a full '040.

I'm pretty sure I've posted this before, but let's do it again.

Most PCI PowerMacs have a hardware cursor, and I believe MacOS *does* use it. @joevt or @dingusdev would know more though.

I'd generally expect the real VIA to be slower than the pseudo-VIA given it's more complex, so I'd lean towards the faster CPU in the IIci making the difference. And yeah, I understand why FIFO full bit went away. It's not useful in any case, especially if you just leave the ASC enabled after...

Thanks again Callan! Wrenches are good, it makes sure we understand what's actually happening. That actually does line up with what I'm seeing in MAME where I got IIci perfect when spamming the Sound control panel, but SE/30 and friends are two IRQs short. Like Doug I don't have an...

I'd love to see results from a II, IIx, IIcx, or SE/30 too, just to get data on the original ASC + discrete VIA2 combination. (Those 4 machines are identical for this testing, so I only need one of them).

Quadra AVs don't have an ASC or EASC so that's expected.

The Classic itself is basically identical to an SE, so the accelerator is likely the source of the incompatibility.

It means when I can actually run more PowerPC machines those details will be handy.

Good to know for if I can ever get my hands on real hardware risu data.

Thanks Callan! Interesting that the 950 and the 700 are slightly different, but that may well be the quad doubler. If it's not a big hassle to try without it I'd love to see that, but if not that's OK too.