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Author Topic: Silly perhaps, but has anyone tried this?  (Read 2920 times)

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Offline Dr_RighteousTopic starter

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Silly perhaps, but has anyone tried this?
« on: May 20, 2003, 04:50:46 PM »
I was looking over the pinouts for the 68040 and 68060 and discovered that they're nearly identical... There are a couple differences, but I'm not sure they really matter.

Has anyone out there tried taking an A3640 card, changing out the regulator to make it 3.3v... Changing out the occilator for 50MHz... Cutting off the center pins of the 68060 and seeing if the system worked?

Obviously you'd lose the advantage of added memory and a few new features... But you'd end up with an upgrade far cheaper than a Cyberstorm MK3 if it worked.

Any thoughts?
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- Doc

A4000D, A3640 OC-36.3MHz, custom tower, Mediator A4000D. Diamond Banshee 16M, Indivision AGA 4000, GVP HC+8.

Mac Mini 1.5GHz, that might run MorphOS someday, when the fools who own it come to the realization that 30 minutes just isn\'t enough time to play with it enough to decide whether or not you like it enough to cough up $200.

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Offline olegil

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Re: Silly perhaps, but has anyone tried this?
« Reply #1 on: May 20, 2003, 05:07:01 PM »
One thing to remember is that the 68060 doesn't use a double clock for anything. A 25MHz 68040 is run from a 50MHz clock in 100% of the cases I've seen. A 50MHz 68060 is run from a 50MHz clock. There's one pin for bclk and one for pclk (unless my memory is wrong, I have looked at a 68k cpu for 2 years now), on the 040 these are different but 060 the same. I think :-)

Except for this there's a couple of odd differences I don't remember at the moment. Anyway, it is doable, because Motorola made 040-060 upgrade kits which only had a PGA to PGA converter with a voltage regulator on it. Everything else was done by rewiring...
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Offline olegil

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Re: Silly perhaps, but has anyone tried this?
« Reply #2 on: May 20, 2003, 05:15:17 PM »
Just found it:
The 68060 has an extra bus arbitration pin, BTT. This is not present in earlier devices. It is used for the 68060 high-speed modes. It must be pulled high with a resistor so it won't be used. It's a bi-directional pin, so the chip will see the pull-up and not use it.

Basically, I guess this means the chip would be more effective with specialized glue logic, but I don't really think any 68060 accelerator for Amiga uses this arbitration mode anyway...

Good luck :-)
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Offline Dr_RighteousTopic starter

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Re: Silly perhaps, but has anyone tried this?
« Reply #3 on: May 22, 2003, 06:24:41 AM »
Yes, the occilator on the card is a 50MHz one... But the question is where is the halving taking place? If it's occuring before the pCLK pin, then it's being driven with 25MHz... In which case I'll have to change out my occilator with a 100MHz one.

Either way, I'm working on an adapter board to just plug the 68060 into the 68040 socket... Adding of course the extra power and ground connectors, and high/low pulls to the other pins. Should make for an interesting project!
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- Doc

A4000D, A3640 OC-36.3MHz, custom tower, Mediator A4000D. Diamond Banshee 16M, Indivision AGA 4000, GVP HC+8.

Mac Mini 1.5GHz, that might run MorphOS someday, when the fools who own it come to the realization that 30 minutes just isn\'t enough time to play with it enough to decide whether or not you like it enough to cough up $200.

 - Someone please design SOME kind of DIY accelerator for the A4000. :D -
 

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Re: Silly perhaps, but has anyone tried this?
« Reply #4 on: May 22, 2003, 12:34:01 PM »
oh please let it work, if it does.. drop a "extensive" thingy in here, so we all may gaze in admiral.. and offcourse, i will steall all your work of the pages, and go find me a cheap second handed card somewhere to try it on...

Best off luck!
B!
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Offline Dr_RighteousTopic starter

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Re: Silly perhaps, but has anyone tried this?
« Reply #5 on: May 23, 2003, 01:58:22 AM »
Actually, I'm working on the schematic for a processor adapter board... One that'll plug directly into the CPU socket (just like the Sonnet Quaddoubler). It'll be publicly released because I'm all about the community  :-D
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- Doc

A4000D, A3640 OC-36.3MHz, custom tower, Mediator A4000D. Diamond Banshee 16M, Indivision AGA 4000, GVP HC+8.

Mac Mini 1.5GHz, that might run MorphOS someday, when the fools who own it come to the realization that 30 minutes just isn\'t enough time to play with it enough to decide whether or not you like it enough to cough up $200.

 - Someone please design SOME kind of DIY accelerator for the A4000. :D -
 

Offline DMC12

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Re: Silly perhaps, but has anyone tried this?
« Reply #6 on: December 25, 2004, 08:38:15 AM »
Thinking about doing the same thing...Any luck so far?
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Offline Effy

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Re: Silly perhaps, but has anyone tried this?
« Reply #7 on: December 25, 2004, 11:16:09 AM »
If it works then count me in, even if it has been 1,5 year ago since those postings !! I´m still interested. Still don´t have a Cyberstorm, only two A3640´s !!  :-)
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Offline Framiga

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Re: Silly perhaps, but has anyone tried this?
« Reply #8 on: December 25, 2004, 02:21:06 PM »
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Offline Orjan

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Re: Silly perhaps, but has anyone tried this?
« Reply #9 on: December 25, 2004, 02:50:52 PM »

At $296 I don´t think many people are interested, considering you have to buy the 060 as well... :-)
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\\"Memory is like an orgasm. It\\\'s a lot better if you don\\\'t have to fake it.\\"
- Seymore Cray, on virtual memory.
 

Offline Framiga

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Re: Silly perhaps, but has anyone tried this?
« Reply #10 on: December 25, 2004, 03:48:47 PM »
oh indeed but he has asked, i've answered :-)

The URL was only for reference pourpose.

BTW . . .have you an idea how much it could costs a project like that?

-1 PGA socket for the 060

-1 PGA socket for the 040

- 1 voltage regulator

PCB- Logic-project and bla, bla . . .

Its not so overprized as you think . . . and even if you can find the sockets at a human price in small batches ;-)

Happy XMas
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Offline Effy

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Re: Silly perhaps, but has anyone tried this?
« Reply #11 on: December 25, 2004, 04:47:44 PM »
Won´t it be easier to overclock a 68060 from 50 Mhz to 100 Mhz ???
Damn, I wished it were easier with that 3640 project ...  :-)
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