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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: ejstans on July 07, 2009, 04:14:56 PM

Title: Amiga 1200 onboard FPU
Post by: ejstans on July 07, 2009, 04:14:56 PM

It seems Commodore had great difficulty nailing down the specs of the Amiga 1200. Eg the schematics show alternative 16-bit ROM and onboard flashrom circuits. Anyway, there is also an onboard 68881 FPU circuit and unlike the others, this is actually present on the motherboard layout. Has someone tried installing an FPU here? Just curious :)

Title: Re: Amiga 1200 onboard FPU
Post by: amiga1260 on July 07, 2009, 04:35:09 PM

I found it on the web:

http://www.amigaworld.de/workshops/flieskommaprozessor-im-amiga-1200/

It's written in German. It's possible to solder a socket and put a co-processor in it.

Title: Re: Amiga 1200 onboard FPU
Post by: delshay on July 07, 2009, 05:53:41 PM

it works,but there will be problems when the trapdoor slot is used.

Title: Re: Amiga 1200 onboard FPU
Post by: ejstans on July 07, 2009, 09:22:25 PM

Alrighty, interesting. Wonder why they didn't bother to put a socket there themselves...

Title: Re: Amiga 1200 onboard FPU
Post by: delshay on July 07, 2009, 09:37:53 PM

Quote from: ejstans;514858

Alrighty, interesting. Wonder why they didn't bother to put a socket there themselves...

cost..

Title: Re: Amiga 1200 onboard FPU
Post by: ejstans on July 07, 2009, 09:43:00 PM

Quote from: delshay;514862

cost..

Yea, maybe the money they spent on patch work on the boards meant they couldn't afford that socket :lol:

Title: Re: Amiga 1200 onboard FPU
Post by: djbase on July 08, 2009, 01:46:37 PM

Quote from: ejstans;514863

Yea, maybe the money they spent on patch work on the boards meant they couldn't afford that socket :lol:

Well, even if the socket would only cost 10 cent and they produced 100.000 machines, this would be total of $10.000 just for the socket they could save.