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Author Topic: MiniMig + PowerPC = OS4 Hardware for all  (Read 29979 times)

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Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« on: October 29, 2007, 01:38:19 AM »
I think this all point in one direction documentation..
So anyone sitting on information on AGA or PPC or for that part any amiga hardware docs. Upload it, so that projects like minimig etc.. may take of.
Whichever direction this takes it sure will need documentation. So might aswell start now to collect information while doing the planning for future boards.

As for PPC accelerator reverse engineering. I think that it might be possible from existing software, CPU docs and pcb board layout. Figure out at least a working re-implementation.
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #1 on: October 29, 2007, 11:31:03 AM »
Don't think a 5V slot is really needed. New hw will likely either by HDL code or 3,3V components. 5V will be a real pain.
People could build a software emulation that is split into modules just like chips on a bus in the real thing. That can later be translated into HDL to help with misc reverse engineering (like Gayle interface).
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #2 on: October 30, 2007, 12:37:09 PM »
@downix:
The reason for Minimig is that the hardware is dying physicaly. And there is no new ones made.
Software emulation won't give cycle accurency that demos & games need.

As for CPUs, ARM is trigger happy litigator. I would be careful about being dependent on them.
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #3 on: October 30, 2007, 11:58:07 PM »
@downix:
motorola/x86/etc.. whichever way I think the point is to take the best
technology below the price bar for most people and apply it in a clever way.
That's what commodore did. Any m68k/PPC is plain nostalgia or for embedded
development not cutting edge.
Even if you don't like non-free cpus they may work as a temporary solution
in the meantime to let one concentrate on other issues.

@Skyraker:
What kind of PPC/Amiga software was made?, is it up to par with currently
available software packages today?
What hardware requirements are needed?, just a PPC cpu or more?

@Kronos:
I think you point to a serious issue. Original pcb designs use through hole
and non-RoHS. And thus any component that will match right off is likely to be
expensive in production and not legal to sell in EU nor will supply likely to
be available. So.. 3.3V and FPGA ;)

@AJCopland/HenryCase:
You point in an interesting direction. Alpha 21164 etc.. why not make our own
cpu design that is optimized for speedy FPGA implementation. Let's not stare us
blind on current cpu architectures (sparc,m68k,ppc,etc..) but make our own
rules. And any ASIC solution later on will for sure be able to handle any
FPGA quirks.
   
@HenryCase:
Don't wake the patent bear :-)
Amiga was not only the custom chips, but also how things were wired together
on a system level. And software to go with it that was efficient.
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #4 on: October 31, 2007, 12:47:16 AM »
@downix:
"remove tasks from the system bus, not overloading the CPU with dumb tasks which will bog it down. Can't avoid that in x86 architecture easily, I've tried."

Could you explain in more detail ..?

As for hardware my point was that one can build hardware and use a off the shelf cpu. And build software for that solution. Later on one can replace the cpu, because most code is high level and not assembler. Thus the only needed replacement is the compiler.
Allowing people to iron out other issues in the meantime. Parallel development would be enabled this way.
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #5 on: October 31, 2007, 12:52:32 PM »
@Skyraker:
They seem to sit on the patents until they rot :-)

@downix:
"add registers to the setup without having to remap" what do you mean by remap?
How does these custom "cpus" know when to run or halt?
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #6 on: October 31, 2007, 02:09:31 PM »
Speaking of PS3.. a Cell cpu wouldn't be too bad :-D

@downix:
What do you mean by "bank of registers" ..?

In the case of Amiga (or even Sun). The co-cpus are started by the main cpu and then continue until told to stop?, or do they start at system boot directly (like the main cpu) ..?
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #7 on: November 01, 2007, 07:52:37 PM »
DDR is an electrical pain. An sdram slot maybe. But DDR, nope.
A single TSSOP-54 chip can offer 64 MByte. Many Amigas didn't even get close. So it better be worth the obstacle with sockets & long nights with oscilloscope and {beep}ing.

Many things are possible, if you are willing to spend the right amount of money.
 

Offline freqmax

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Re: MiniMig + PowerPC = OS4 Hardware for all
« Reply #8 on: November 02, 2007, 08:02:59 AM »
Actually some people have started to use bread toasters instead of pizza ovens to rewflow solder. And Minimig fits..
So it might just be doable, but you have no way of verifying solders without x-ray.