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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Astral on March 12, 2010, 09:40:59 AM

Title: Help with my A2000 accelerator to A500 project
Post by: Astral on March 12, 2010, 09:40:59 AM

I'm acquiring the bits to adapt an A2000 accelerator card to an A500. It's going to connect to the side Zorro slot to start off with and hopefully develop from there - I just want to get it working first. Basically, comparing the A2000 CPU slot pinouts to the A500 Zorro pinouts, they are VERY similar, with only 4 pins different.

I just need to get a bit of an idea of how different/important/necessary to connect these pins are...

A500 pin 9 is not connected - A2000 CPU slot pin 9 28mhz clock
A500 pin 20 PALOPE - A2000 CPU slot pin 20 BOSS
A500 pin 60 BR - A2000 CPU slot pin 60 CBR
A500 pin 64 BG - A500 CPU slot pin 64 CBG

Can anyone shed some light?

Title: Re: Help with my A2000 accelerator to A500 project
Post by: Dandy on March 12, 2010, 12:47:29 PM

Quote from: Astral;547311

I'm acquiring the bits to adapt an A2000 accelerator card to an A500. It's going to connect to the side Zorro slot to start off with and hopefully develop from there - I just want to get it working first. Basically, comparing the A2000 CPU slot pinouts to the A500 Zorro pinouts, they are VERY similar, with only 4 pins different.

I just need to get a bit of an idea of how different/important/necessary to connect these pins are...

A500 pin 9 is not connected - A2000 CPU slot pin 9 28mhz clock
A500 pin 20 PALOPE - A2000 CPU slot pin 20 BOSS
A500 pin 60 BR - A2000 CPU slot pin 60 CBR
A500 pin 64 BG - A500 CPU slot pin 64 CBG

Can anyone shed some light?

Hmmmm - I wanted to build the fastest 68k A500 using an 060 accelerator board for the A2000.

For that project I bought the Micronik Zorro II busboard (http://www.amiga-resistance.info/bboahfaq/index.php?action=artikel&cat=77&id=3560&artlang=de) when Micronik withdrew from the Amiga market, which provides an A2000 CPU Fast Slot, where I wanted to plug in the accelerator.
Unfortunately I never found the time to realise this project - so the busboard still lies in a locker - still "brandnew" and unused...

Title: Re: Help with my A2000 accelerator to A500 project
Post by: Tahoe on March 12, 2010, 03:33:47 PM

Quote from: Dandy;547318

Unfortunately I never found the time to realise this project - so the busboard still lies in a locker - still "brandnew" and unused...

If you ever consider selling this.... :)

Title: Re: Help with my A2000 accelerator to A500 project
Post by: Gulliver on March 12, 2010, 05:39:41 PM

I remember I attached an A2630 accelerator about ten years ago to an A500. It worked. Two things are important: double checking conections and keeping cables as short as possible, to avoid signal degradation.
I cant remember the exact way i did the wiring, but i did it by looking to the Amiga Hardware Reference Manual, and that was basically it.
Before you attempt a hack like this one i recomend you get yourself a proper card edge conector/cpu slot, both available in ebay from time to time at about 10 USD each.
Think about fixing the accelerator board in a specififc place and not moving it, or you will end up unsoldering your wiring.


Good Luck and happy hacking! :)