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Author Topic: How unusual is this? CPU card with two CPUs  (Read 2953 times)

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Offline HeiroglyphTopic starter

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How unusual is this? CPU card with two CPUs
« on: June 07, 2010, 02:44:42 AM »
In my search to get my 4000 running, I grabbed a stack of old CPU cards, mostly A3640s.

There was one A3200/A3400 card that had both a 68020 and a 68030 plus the jumpers to switch between them.

I've seen plenty with only the 030 on them, but never one with both so I thought someone else might be interested in seeing it.

John
 

Offline HeiroglyphTopic starter

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Re: How unusual is this? CPU card with two CPUs
« Reply #1 on: June 07, 2010, 05:42:35 AM »
Yes, they are full parts.

MC68020 FE 25 and 68030 FE 25 plus the 68882 FN 25.

Looking at it more closely, it also seems to be fully populated which is unusual based on the big book of Amiga hardware and my other card.

It has the MapRom circuitry (jumpered  as if in use) and the extra jumpers to switch CPUs.

Comparing the stickers on the back of the card:
A usual card is marked A4CPU EC030 and has a testing sticker.
This one says 68020/30 CPU CARD and has no trace of a testing sticker.

It wouldn't surprise me if it was an early test unit.
 

Offline HeiroglyphTopic starter

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Re: How unusual is this? CPU card with two CPUs
« Reply #2 on: June 07, 2010, 03:13:06 PM »
I'd update the bboah but I can't tell which is the "real" one anymore, there are too many online.  Anybody know?

Also their page is wrong about the "developer" card, it's not overclocked, it just has a 33Mhz 68882 driven by a 32Mhz crystal.  The CPU isn't driven by that crystal but the FPU optionally is.