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Author Topic: Amiga 1200 onboard FPU  (Read 3161 times)

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Offline ejstansTopic starter

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Amiga 1200 onboard FPU
« 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 :)
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"It is preferable not to travel with a dead machine."

A500 1.3 / 512KiB slowmem / GVP HD8 w/ 8MiB fastmem & 52MB HDD
A600 2.05 / 1GB SSD
A1200 3.0 / Blizzard 1200/4 w/ 68882 @ 33MHz / 1GB SSD
A1200T 3.0 / Apollo 1260 w/ 68EC060 @ 50MHz & 16 MiB fastmem / 4GB SSD
 

Offline amiga1260

Re: Amiga 1200 onboard FPU
« Reply #1 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.
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Offline delshay

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Re: Amiga 1200 onboard FPU
« Reply #2 on: July 07, 2009, 05:53:41 PM »
it works,but there will be problems when the trapdoor slot is used.
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Offline ejstansTopic starter

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Re: Amiga 1200 onboard FPU
« Reply #3 on: July 07, 2009, 09:22:25 PM »
Alrighty, interesting. Wonder why they didn't bother to put a socket there themselves...
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"It is preferable not to travel with a dead machine."

A500 1.3 / 512KiB slowmem / GVP HD8 w/ 8MiB fastmem & 52MB HDD
A600 2.05 / 1GB SSD
A1200 3.0 / Blizzard 1200/4 w/ 68882 @ 33MHz / 1GB SSD
A1200T 3.0 / Apollo 1260 w/ 68EC060 @ 50MHz & 16 MiB fastmem / 4GB SSD
 

Offline delshay

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Re: Amiga 1200 onboard FPU
« Reply #4 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..
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Offline ejstansTopic starter

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Re: Amiga 1200 onboard FPU
« Reply #5 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:
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"It is preferable not to travel with a dead machine."

A500 1.3 / 512KiB slowmem / GVP HD8 w/ 8MiB fastmem & 52MB HDD
A600 2.05 / 1GB SSD
A1200 3.0 / Blizzard 1200/4 w/ 68882 @ 33MHz / 1GB SSD
A1200T 3.0 / Apollo 1260 w/ 68EC060 @ 50MHz & 16 MiB fastmem / 4GB SSD
 

Offline djbase

Re: Amiga 1200 onboard FPU
« Reply #6 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.
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