adapting sidecar to CPU fast slot connector

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Jope wrote:

Cyberus wrote:
Well, what I meant is, how do I go about getting the 28MHz to  the connector? It's just a case of taking it off the clock line on the motherboard and soldering a wire to pin 9 of the female connector on the mobo?
Or more importantly, a better question would be:
Is, and why is, the clock signal needed by an accelerator sitting in the CPU fast slot? Surely the accelerator generates its own clock signal?

Well, if you like, you can try it without the 28MHz signal, bu t otherwise you need to snipe it off the A500's mobo somewhere. Check the schematics. The Agnus has a 28MHz pin IIRC.

The A500 edge connector puts out a 7Mhz signal right? It's a long shot but one could include a clock multiplier to feed the 28Mhz pin on the adaptor? Maybe that wouldn't sync properly, I don't know :-?

[bloodline]

Jope wrote:

The A500 edge connector puts out a 7Mhz signal right? It's a long shot but one could include a clock multiplier to feed the 28Mhz pin on the adaptor? Maybe that wouldn't sync properly, I don't know

Yes, why not.. I guess that's what the Supra Turbo 28 did..

Then again, since this is a homebrew mod requiring a ton of wire anyway, one more can't hurt so it can be tapped off the Amiga's internal 28MHz clock. :-)

I wouldn't want to have a motherobard patch and not as a nastly long wire from poor agnus... a better solution would be to multiply the signal from Pin7 and connect it to Pin20, that way he could use his adaptor on any A500  :-)

-Edit- This should help A500 Theory of Operation