WinUAE config for Demo AGA Amiga 060

Hi there,


is there a config out for emulating those demo aga amiga machines with 060 turbocard 66mhz?

[Foebane]

Originally Posted by moveq

Hi there,


is there a config out for emulating those demo aga amiga machines with 060 turbocard 66mhz?

Attached is what I use for such demos.

thanks a lot

[Toni Wilen]

This kind of config technically does not exist but 68040/060 CPU fastest possible mode is almost always good enough. Most 68040+ demos work fine even if CPU is "too fast".

Note that usually it is easier to use 68040 than 68060 in emulation because 68060 is only "required" because real 68060 is much faster than 68040 and use of 68060 requires correct 68060 libraries or you get crash at boot.

[chip]

I saw a lot of AGA demos and till now i never needed a 68060 cpu

I always used 68020 or 68040

Thanks for the explanation. When coders use WinUAE for there development, did they also use a 68040 emulation? How could they be sure that's there routines works well on an real amiga with 68060?

[Foebane]

Originally Posted by chip

I saw a lot of AGA demos and till now i never needed a 68060 cpu

I always used 68020 or 68040

I used those and the 68030 as well.

As far as I can see, there's really no reason to go to 68060 libraries just to try and get the few demos that demand that to run. I used to do this, but then I was told about a handy little utility called "Make060" that tricks the demo into thinking it's running on a 68060.

Originally Posted by moveq

Thanks for the explanation. When coders use WinUAE for there development, did they also use a 68040 emulation? How could they be sure that's there routines works well on an real amiga with 68060?

As far as I know, most development is done on emulation, but I'm certain that they test their work on real hardware at some point.

Nice trick with the Make060. Hmm testing on real hardware. A 1200 with turbocard 060/040 is too expensive for me.



My goal is to get step by step into demoprogramming with WinUAE. How compatible is WinUAE to a real A500 or A1200 with 060?

[chip]

You should ask to Toni Wilen, the developer of WinUAE

You cand find him here in the forum

[dodke]

For programming a500 demos using correct settings with cycle exact mode will be very close to real hardware in speed. If you target any accelerated Amiga as far as I know you will need to test the speed of your routines on real hardware.
On my laptop if I disable JIT and use 68040 in FS-UAE the speed is slightly faster than real 060 but some things will be more off than others so you can't really trust it. Like random memory access is generally slower on real hardware and I doubt any caches are emulated.
If you're only starting you could simply try to generally optimise your routines and figure out how much you can do calculations per pixel etc and just go with that.

[Toni Wilen]

If there is difference vs WinUAE A500 cycle-exact mode: it is a bug and should be reported (but only after making sure hardware config is 100% identical). There is no known compatibility or cycle-accuracy problems except bad programs that write to BLTCON0/1 when blitter is running. (Which can't be fixed without blitter logic diagrams/schematics)

Any other modes: CPU speed is not accurate. Chipset is still cycle-accurate and even if many people can't seem to understand it: practically all compatibility problems in 68020+ modes is due to CPU speed (too slow or too fast). It is not chipset related!

Any CPU: emulation is always very very useful when debugging. Very quick to change hardware config, KS version and everything, can freeze/run step by step/modify any program/program's state without side-effects. (=Everything stops which can't be done with real hardware). Can see contents of all registers, including write-only. And so on..

Thank's a lot for the professional answers. I think I will start with the old OCS A500 on WinUAE.

But the 68000er CPU Speed is accurate?

[Toni Wilen]

Originally Posted by moveq

But the 68000er CPU Speed is accurate?

Yes. 68000 cycle-exact mode is fully accurate.