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AuthorTopic: Amiga 3000 GAL chip replacements for PAL  (Read 1055 times)

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Offline dschallock

Amiga 3000 GAL chip replacements for PAL
« on: August 05, 2015, 04:51:50 PM »
I recently purchased Gal chip replacements for the PAL U202 U203 U701 and U714 chips from an ebay seller.  The item was listed as ;
Amiga 3000 GAL replacements for PAL U202 U203 U701 U714

At the time he had quantity of 4.  The listing is not there now, so I assume he sold out.  I don't know the seller personally so I don't know when or if he will be selling these again. however.... I just wanted to highly recommend this upgrade to anyone with an Amiga 3000 who is experiencing the garbled graphics issue after the computer warms up.  I have had this issue for years now and never knew what to do about it.  I read on the forum here about the issue being these particular PAL chips.  Apparently there is something called a GAL chip which is programmable and runs cooler.  Some people (like this ebay seller presumably) have the equipment necessarily to program these GAL chip replacements with the correct instructions to function like the original PAL chips in question and do so cooler.

 The seller had detailed instructions including pictures on how to do the swap.  I would recommend using a proper chip puller tool as the chips a little frozen in place if they haven't been moved since 1991.  I rocked a little pressure back and forth and the chips slid right out with no damage or bending of the pins.  I carefully placed the new chips in place (being sure to note the position of the little half moon on the chips) and gently pressed them into place.  Fired the computer back up, placed for hours and the graphics are rock solid now!  No more problems!
I bought these chip for under 30 dollars.  One of the best purchases I have made to date on my Amiga and I would highly recommend it to anyone else with a 3000 and the garbled graphics issue.  I would also recommend the ebay seller "cowdog360" if he sells more in the future.

Offline Amiga_CDTV

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Re: Amiga 3000 GAL chip replacements for PAL
« Reply #1 on: August 05, 2015, 06:34:24 PM »
I had no problems with my 3000T, but I bought one of those sets for it anyway. The old chips did run very hot (even the stickers on top of the chips had darkened). I can also recommend his kits, and the instructions were very good indeed.

He has threads selling this kits at least on EAB and AmiBay (as cowdog360, too).
Commodore KIM-1, PET-2001, CBM 8032, CBM 8050, CBM 8250LP, D9060, VIC-20, C64, C64c, 1541, 1541-II, 1571, 1581,
Amiga A1000, A1060 Sidecar, A500, CDTV, CD32, 1084S, A1200, A1200 Magic Pack from Petro, ex-custom-case A3000T (now a complete A3000T), repaired A4000T and looking for more :)

Offline pwermonger

Re: Amiga 3000 GAL chip replacements for PAL
« Reply #2 on: August 05, 2015, 07:39:04 PM »
I picked up a set of these. My 3000 has no issues, but for the price who could resist making it a bit more reliable.

Have not installed them yet, want to wait until we're ready to tape it for the guru meditation channel before I do. Lots we want to do with that 3000 including install AmigaUnix on it.

Offline tlgrooms

Re: Amiga 3000 GAL chip replacements for PAL
« Reply #3 on: July 21, 2020, 08:20:11 PM »
Does anyone know where I could purchase a set of these now for my 3000T?

Offline cdh

Re: Amiga 3000 GAL chip replacements for PAL
« Reply #4 on: October 23, 2020, 09:45:23 PM »
I've got two Amiga 3000D computers with stability issues and would like to try replacing the PALs with GALs. It's been several years. Does anyone know where I can get these?

Offline Acill

Re: Amiga 3000 GAL chip replacements for PAL
« Reply #5 on: October 28, 2020, 07:48:49 PM »
Not sure if he still makes them or not as he sold his A3000 awhile ago and can't test them any longer. If you send me an email or message me through my website I can see if I can find out more info. I also tried to make them, but have been getting stuck with counterfeit or remarked Gals every time I order them.

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Offline dalek

Re: Amiga 3000 GAL chip replacements for PAL
« Reply #6 on: November 17, 2020, 02:13:45 AM »
No need to stress about fakes - these are available new from everywhere:

e.g. for you U.S. folks: https://www.arrow.com/en/products/atf16v8b-15pu/microchip-technology

To program the ATF (Atmel) gals with a TL-866, make sure you are using the latest firmware and select "encrypt chip".