Recent content by Oliver_A

Or, and it‘s a speculation on my side now, the ROM is actually right, and MAME generates a wrong exception stack frame. An 68LC040 generates a different kind of stack frame in case of a missing FPU than an 68030 or 020 executing a unimplemented coprocessor instruction.

Thanks for all the tips, just waiting for all the parts to arrive. I'll be also recapping the power supply and analogue board. Due to the problematic weather conditions in the US, shipments from Mouser are currently very slow. The most difficult aspect will be to find out if GLUE, or any other...

Slowly delving into the Macintosh specific software support of the Prodigy. ;)

My theory is that, if an FPU exception (which is the actual behaviour of an LC040) causes a sad Mac on emulation, then something else is being done by the ROM beforehand in order to determine the CPU. But how does the ROM, then, can successfully distinguish between a full 040 and an LC040? I...

Small steps... Board has now more components, AND, CUDA and myself are now friendly with each other (sort of) ;) So DeMon runs now both on MAC and Amiga with same features. Still waiting for the power regulator, since Mouser cancelled the order for some unknown reason, so I had to get it...

So, my Macintosh SE/30 arrived yesterday. :) Ain't she a beauty? BUT..................! Yep, as expected, the battery wreaked havoc on the PCB. And so the journey of restoring this, otherwise beautiful machine, begins. ;) Interestingly, this SE/30 also had a third party graphics card...

Thanks! :) The ROM already works on an 040 (see Amiga - in fact, I'm using a 040 for a bring-up of the design), and, as I mentioned, my goal is to maximise speed on both 040 and 060. The good thing is that no overclock of the mainboard bus is needed, so a 50MHz 040 works with a 25MHz towards...

Thanks, perfect! :) Believe me, it's not easy as an outsider to find such information if you search for "CUDA". ;) So, in the meantime, I started to assemble the prototype.... No time wasted.

As I said, the hardware function exists, and perhaps it will come in handy at some point. ;) Same as with the P-Vision, I will publish a complete register description of the DoubleVision. The mouse sprite is 3 colors and has its own independent palette, so it has constant appearance no matter if...

No, because I‘m using SwitchRes to define profiles for automatic resolution switching for certain games. I suppose then that I should do the resistor mod instead, since everthing works great at 40MHz

Hello there, while I was running the Soft475 extension, I noticed the following issues during usage: Any screen resolution change flips the clock back at 25 Mhz (the default jumper clock setting) When using 40 MHz and switching to a 640x480 resolution, the pixel clock (which is also generated...

I'm a bit stuck here, does anyone have the following document online somewhere? I have only seen excerpts of it, but I guess the full document would really help me here. :) Thanks!

Gee, thanks. Next time, I will do better, promised! ;)

What the core also has, but might be of no use for MAC users: * 64x64 Hardware sprite for mouse pointer * Full display co-processor to support Amiga-style draggable screens. In short: on any given vertical raster line, you can define "display slices" which have their own resolution and color depth.

Just to give you some pointers, here is my same graphics core running on the Amiga. It's using PCMCIA Interface of the Amiga 600/1200, but is COMPLETELY usable. Yes, even for MAC, if you run ShapeShifter. ;) But here, we are going to run this on original MAC hardware.