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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Amiga1200User on March 21, 2010, 08:03:23 PM

Title: Amiga 1200 internal ram chips
Post by: Amiga1200User on March 21, 2010, 08:03:23 PM

I want to replace the ram chips on the Motherboard with larger ones. I can desolder the old ones just fine (I have the equipment), I am at a loss as to what size chips this unit will take.

There are 4 chips there now for a max of 2MB. What is the largest chip size that I can address internally?

Can I go to 4MB? 8MB? 16MB? I'm sure that I can locate RAM chips that will replace these, just need to know how big I can go!

Thanks!

Title: Re: Amiga 1200 internal ram chips
Post by: SamuraiCrow on March 21, 2010, 08:14:45 PM

2 MB of Chip RAM is as high as you can go.  The Lisa chip was never designed to go higher than that.  Commodore went bankrupt before they could improve the design.

Title: Re: Amiga 1200 internal ram chips
Post by: save2600 on March 21, 2010, 08:20:02 PM

Here's a link to the pinouts on the A1200's trapdoor expansion slot if you want to try and build yourself a Fast RAM board  :-)

http://pinouts.ru/Slots/A1200CPU_pinout.shtml

Title: Re: Amiga 1200 internal ram chips
Post by: Zac67 on March 21, 2010, 10:19:31 PM

Quote from: SamuraiCrow;549064

2 MB of Chip RAM is as high as you can go.  The Lisa chip was never designed to go higher than that.  Commodore went bankrupt before they could improve the design.

Actually, Alice is limiting chip RAM size. ;)