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Amiga Talk Talk: Amiga PPC
Posted on Sunday, February 05 2012 @ 16:55:23 CST by majsta

I was trying to get more info about creating PPC accelerator boards for Amiga. First I was talking with Rodolphe ***** and his work can be found HERE. Some of the informations on his website may be nice starting point for creating number of accelerators for Amiga.

My conversation with Rodolphe *****
Wednesday, January 5, 2011 6:40 PM

Majsta:
First of all i m working on some accelerators for Amiga600 and and lot of work is done, in next few days i ll build prototypes. But this is the only first part, i would like to work on PPC accelerators for Amiga. As you know there are Sonnet Creshendo cards with G3/G4 systems for MAC, and they are used to give maximum performace to old machines using PCI.

Rodolphe *****
You mean the PPC is connected on the PCI slot ??? The PCI is very low bus ...too low for a PPC. Data bandrate between PPC and RAM system will be poor...

Majsta:
As you allready know Elbox have mediator PCI interface and they have SharkPPC accelerator. In my investigation Sonet products are the same as SharkPPC and price is more then 25 times lover. So then i read about WarpOS and i think only reason for Sonnet products to work with mediator is lack of ppc libraries or drivers and those from WarpOs can be changed to work. I would like to talk with you about adding PCi to Amiga600 and then using PCI to add PPC accelerator.

Rodolphe *****
Not a good idea : you should connect PPC directly to the system bus. No expansion bus on Amiga 600 ?? Why Amiga 600 ?? It is a very rare machine! Amiga 1200 ok.

Majsta:
Or just ppc accelerator. I need from you some guidance how to start with this. In my accelerator I worked with MC68SEC000AA20 and BSI SRAM memory and GAL16V8 logic device. But i need more power and i dont know how to start with PPC design. Also i use quartus for Altera designs, and now i m confused. What is the best I can do using emulated MC68000 core with Cyclone II to gain some power or to make PPC accelerator.

Rodolphe *****
I cannot help you about VHDL because I'm not expert... I code with AHDL my CPLD... not using FPGA ! I do not see why you want to code a 68000 into the FPGA! Keep the 68020 near the PPC... connect PPC and deasctivate the 68020 or use it as second processor. This choice is really depending of the OS (it can or cannot manage with 2 different CPU !)

Majsta:
I hope that you will help me with this.

Rodolphe *****
I do not think... The PPC bus protocol is very different than 68K familly even if some signals are the same...(TS, TA, ...) The logic interface is important.... A big work... A long time ago I did a logic interface between PIII PC bus and G3 (IBM PPC750G), the idea was to connect directly a PPC CPU on PC motherboard by the P2/3 socket ! Like this we had an Atari/Amiga machine without designing the motherboard...;-)

Majsta:
Or just ppc accelerator. I need from you some guidance how to start with this. In my accelerator I worked with MC68SEC000AA20 and BSI SRAM memory and GAL16V8 logic device. But i need more power and i dont know how to start with PPC design. Also i use quartus for Altera designs, and now i m confused. What is the best I can do using emulated MC68000 core with Cyclone II to gain some power or to make PPC accelerator.

Rodolphe *****
I cannot help you about VHDL because I'm not expert... I code with AHDL my CPLD... not using FPGA ! I do not see why you want to code a 68000 into the FPGA! Keep the 68020 near the PPC... connect PPC and deasctivate the 68020 or use it as second processor. This choice is really depending of the OS (it can or cannot manage with 2 different CPU !)

Majsta:
Is there any way to use VHDL with some Cyclone FPGA to multiply CLK to get some king of sinhronisation?

Rodolphe *****
Sorry I cannot help because I do not see what you need...I do not use VHDL with Cyclone FPGA. I designed a 68060 + SDRAM board but I never need to multiply the 060 clock...

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Then I was thinking why creating PPC accelerator if we have something like Sonnet G3/G4 accelerators and we have OS 4.1. So I searched for answers... I can't say name of the person I was talking to because I don't want to give anyone hard time.

My conversation with NN
Wednesday, January 5, 2011 5:40 PM

Majsta:
I would like to talk about Mediator from Elbox and the possibility of writing a driver for Sonnet G3/G4 accelerators that are prepared for the Mac. Because it seems to me that they are almost the same with Elbox's SharkPPC accelerators. So the problem could only be with drivers. Can you explane to me basic strategy of adding PPC libraries to OS 4.1 Classic because if there is support for SharkPPC what about support for Sonnet accelerators.

NN:
I'm afraid I can not help you much because my contract prohibits the "disclosure" of information acquired through the mailing list I have mentioned. Moreover, even we do not know everything. If you need reliable information, I think it's best to write Hyperion (more precisely, Ben Hermans) and ask him what you want to know, he was the only one who can/should give you correct informations. Note that he is usually quite busy and it may take until he repliy.


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