A-Max with 68030 non-MMU emulation

[mark_k]

This is to report a (possible) couple of issues which I saw on trying to get A-Max running with a 68030 non-MMU config.

So far I couldn't get Mac emulation to start properly without enabling the 68030 MMU.

With 68030, no MMU, no JIT, "more compatible" and "Cycle-exact (DMA/Memory accesses)" checked, GVP series II SCSI...

The first issue is seen in booting the HDF (so not related to A-Max). The HDF starts booting (plain OS 3.1 installation) then get
Exception 3 (fa006a) at fa006a -> f80b0e!
software failure alert and reboot loop.

After adding "Set echo on" to the beginning of startup-sequence, the last line printed is
MakeDir RAM:T RAM:Clipboards RAM:ENV RAM:ENV/Sys

Booting seems to stop there with no further SCSI accesses and no Exception 3 lines. The Amiga OS hasn't crashed (can still move the mouse pointer).

If I un-check "Cycle-exact (DMA/Memory accesses)", the HDF boots to Workbench normally. Then on trying to start the Mac emulation, it sits at grey screen for a few seconds, then get this over and over in the log:
Exception 3 (9d08a2) at 9d08a2 -> 9d112a!
Exception 3 (9d08a2) at 9d08a2 -> 9d112a!

Config:

https://www.media!fire.com/?02vwcfe3ism8lu4

[Toni Wilen]

After 3.5 because 3.4 works exact same.

Amax crashing most likely happens because it assumes full 68030. It sets up translation tables and things go wrong when translations don't work.

[mark_k]

A-Max does detect that there's no MMU; if you click Memory Preferences it says "MMU Not Available". And the same can't-get-it-to-work with 68020 no-MMU too.

I noticed that if I enable 24-bit addressing then the Mac OS does boot. Next step will be to try some other A-Max versions. I was using AMAX256.DMS which has embedded Mac ROM courtesy of Quartex...

[Seiya]

instead i have this problem with a-max iv set to run on 68040.



after 32-bit color loaded stop to loading.

[mark_k]

A-Max IV is (probably) very different from A-Max II, because it allows multi-tasking. Doesn't A-Max IV require a Zorro II board which WinUAE doesn't emulate?

[Seiya]

a-max iv should be run also on AGA/ECS chipset. The manual says it supports 24 bit display card and amiga video (pal and ntsc)

[AnnaWu]

Originally Posted by Seiya

a-max iv should be run also on AGA/ECS chipset. The manual says it supports 24 bit display card and amiga video (pal and ntsc)

Yes, I agree.
My quickly created config.

[Toni Wilen]

Originally Posted by Seiya

instead i have this problem with a-max iv set to run on 68040.

Originally Posted by AnnaWu

My quickly created config.

"It does not work" "Here is something that [probably] makes it work".

Very useful.

[Toni Wilen]

Originally Posted by mark_k

The first issue is seen in booting the HDF (so not related to A-Max). The HDF starts booting (plain OS 3.1 installation) then get
Exception 3 (fa006a) at fa006a -> f80b0e!
software failure alert and reboot loop.

Fixed. 68030 + memory cycle exact used wrong BSR function (stacked data bypassed data cache handling)

[Seiya]

Originally Posted by AnnaWu

Yes, I agree.
My quickly created config.

i'll try very soon

the first time i try your config ok, is go on but not loaded system.
second time, stopped to 32bit loaded..
however, i cannot use jit with cpu_speed=max with A-Max IV because i have guru 8000 0006
Same result with 68030 and 68882

[mark_k]

I noticed that with the current pre-beta winuae.exe, there's now an "EC" option in addition to None and MMU. A-Max does boot when that option is selected.

[Toni Wilen]

Originally Posted by mark_k

I noticed that with the current pre-beta winuae.exe, there's now an "EC" option in addition to None and MMU. A-Max does boot when that option is selected.

Does TT0 and/or TT1 registers have non-zero contents? Break to debugger and check what r-command shows. (Include also TC)

(warning: do not use 68030 + MMU + more compatible, it is getting updated with full CPU cache support and is not stable at the moment!)

[mark_k]

I might have been mistaken. Running WinUAE and starting emulation with "EC" selected, on starting Mac emulation I just get a black screen.

Before, I probably first booted the Mac with MMU emulation, then opened WinUAE settings, changed from MMU to EC then clicked Reset. It seems that doesn't actually change MMU emulation, because on running A-Max then, it still says MMU Enabled on the Memory Preferences screen.

[Retro1234]

anyone know if A-Max IV can be run in colour?

[amiman99]

Originally Posted by Retro1234

anyone know if A-Max IV can be run in colour?

I got Amax IV running in color on my A3000
[ Show youtube player ]

[Retro1234]

Yeah cool video I had seen that sorry I mean 256 colour etc

[amiman99]

Originally Posted by Retro1234

Yeah cool video I had seen that sorry I mean 256 colour etc

Like in AGA Amiga 4000, or graphics card mode?
I think it may not work in A4000 because it has 68040 CPU. Maybe with 6803 board could work.

As far as using graphics card, like Picasso II, I don't remember if I tried it on my A3000. Maybe I did but the card did not show up in the VIDEO tab to be selected.

[Retro1234]

Yes AGA I'm sure I tried but couldn't get 256?

Or maybe graphics card is 256 possible with graphics card?

[amiman99]

Originally Posted by Retro1234

Yes AGA I'm sure I tried but couldn't get 256?

Or maybe graphics card is 256 possible with graphics card?

I found this in the Amax manual:
" If you have a display card, such as a Picasso or Retina board, and have installed the proper A-Max driver in the Devs : A- MaxVCtrls directory, this card will also show up in the Controllers list. All of the controllers displayed in the Controllers list are available within the Macintosh emulation"

[Retro1234]

Thanks, Interesting I think there might of been some fake graphics card driver for AGA, wonder if it would work with Amax.