Emulating OS4

[AndrewBell]

downix wrote:
or the Amiga Kickstart 3.1 image w/ an m68k emulator.

That is incorrect. A small 68k program called Bootloader is used to load the Kickstart directory contents into ram and reboot the machine in PPC only mode. An emulator modified to boot OS4 could do this automatically and negate the need for 68k and KS3.1.

Amiga chipset emulation, on the other hand, does seem to be necessary, at least in my one experience of installing OS4. During installation the only video output I could display was from the RGB connector, my CVPPC seemed to be initialised but did not output any signal.
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[AndrewBell]

bloodline wrote:

beakster2 wrote:


I think the best way to get OS4 emulation would be to add PPC support to UAE.  This would give UAE the ability to emulate an A1200/4000 with a PPC card, and hence boot the OS4 Classic which is available to buy.

That would be the most compatible and fun for sure, but don't think it's just a simple case of adding a PPC emulator thread to UAE... I suspect the PPC has complex timing interactions with both the Amiga and the 68k which have to be met in order for it to work like a PowerUP board :-(

Those timing interactions are only relevant when the 68K and PPC have to co-exist, and under OS4 the 68K is turned off.
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[AndrewBell]

Jeff wrote:
@AndrewBell

What frequency is the output of AGA during the OS4 installation? Is it standard 31khz or 15khz?

Thanks,
Jeff

15KHz, I had to connect to the TV during install. After I posted about that I looked at the CD startup-sequence, and it seems that my CVPPC was ignored because my Cyberstorm has the last firmware, with the G-Rex cybpci.library. The SS checks for its' presence, and if found will ignore the CVPPC.
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[AndrewBell]

AMC258 wrote:
I did install OS4 on my A3000 without AGA...  In fact, I didn't need the ECS either.  My Voodoo 5500 worked from the gitgo.

When I said AGA might be needed, I actually meant Amiga chipset emuluation might be needed. After a closer look, I found out that my issue was caused by using the last version of the CSPPC firmware without a G-Rex. I didn't plug my Voodoo in until after I had installed OS4.
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