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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: blackhula on September 02, 2010, 08:15:00 AM

Title: amiga 1200 CIA's
Post by: blackhula on September 02, 2010, 08:15:00 AM

Hiya. A while back I tried firing up the old 1200, and the floppy drive didn't work.  I swapped out the drive, and still nothing. My guess now is that it's the CIA chips. I cracked open the machine and am lucky that it's got those chips socketed. Easy fix?

In looking around online, there seems to be some confusion over whether I can just drop a pair of CIA's from another Amiga in there. I've got a couple 2000's that aren't doing anything, and I'd love them to donate their CIA's to the cause. Will they work?

BTW the CIA's in the 1200 have different numbers stamped on them. They are:

391524-01
391523-01

Thanks for your help!

Title: Re: amiga 1200 CIA's
Post by: kolla on September 02, 2010, 09:47:05 AM

The chips you describe sounds like the Kickstart ROMs, not the CIAs. The A2000 has larg socketed CIAs, the A1200 has small square SMB mounted ones. On both the should be marked 8520 somehow.

Title: Re: amiga 1200 CIA's
Post by: blackhula on September 02, 2010, 09:54:57 AM

Whoops - shows you how long it's been. I was going by some clearly wrong info I found online. I thought that some 1200's had socketed CIA's. Yeesh - if they're only SMB, I'm screwed. Not only do I not know where to get those (the CIA's on Ebay are usually socketed chips, and are pretty expensive), nor do I have the chops to work with SMB. Ugh.  Poor ol' 1200 - I was really looking forward to using it again for some performance stuff.  THanks for the reply - any more advice out there?

Title: Re: amiga 1200 CIA's
Post by: psxphill on September 02, 2010, 10:45:28 AM

Quote from: blackhula;577269

Hiya. A while back I tried firing up the old 1200, and the floppy drive didn't work. I swapped out the drive, and still nothing.

Is it a Commodore or Amiga Technologies A1200?
When you swapped the drive, what type did you put in?
 
You can't swap drives between CBM/AT without modding the drive, the cable or the motherboard (I modded my AT motherboard back to CBM spec and then modded the drive as well).

Title: Re: amiga 1200 CIA's
Post by: blackhula on September 02, 2010, 07:02:34 PM

It's a Commodore 1200 that i got in the early 90's. I bought a 1200 drive off of Ebay, though it was of a different make than the original. It's Chinon fz-357. Is that a compatible one?