Oops!, looks like my lucky day (I think)

kipper2k · 27 February 2009, 04:40

So here i am with nothing to do so i decide to remove the bad CIA chip off my 1200 after i fried it. I tried to remove the chip a little too soon and here is the damage... looks like the 2 pads i lifted are not used so hopefully no damage done... i guess i'll find out when i replace it ( as soon as i can find a replacement

heres a closeup...

http://www.kipper2k.com/images/closeup.jpg

Fingerlickin_B · 27 February 2009, 05:46

Well it looks like more than two might not be used, which leads to this:

I read in another thread that you are after a replacement CIA, but of course A600/A1200 CIAs are hard to come by.

The A1200 CIA has 44 connection points, but it appears not all of them lead anywhere.

The socketed CIAs (eg, A2000) have only 40 legs.

If you can obtain pinouts/datasheets for both CIA types, you may very well be able to use the older style CIA with a bit of hacking (make an adaptor PCB, or even just run fly wires from the PCB directly to the legs of the "wrong" CIA.

Now we wait for replies from those who would know if this is indeed possible

PZ.

kipper2k · 27 February 2009, 06:24

Quote:

Originally Posted by Fingerlickin_B

Well it looks like more than two might not be used, which leads to this:

I read in another thread that you are after a replacement CIA, but of course A600/A1200 CIAs are hard to come by.

The A1200 CIA has 44 connection points, but it appears not all of them lead anywhere.

The socketed CIAs (eg, A2000) have only 40 legs.

If you can obtain pinouts/datasheets for both CIA types, you may very well be able to use the older style CIA with a bit of hacking (make an adaptor PCB, or even just run fly wires from the PCB directly to the legs of the "wrong" CIA.

Now we wait for replies from those who would know if this is indeed possible

PZ.

I just found this data sheet online...
http://www.amiga-stuff.com/hardware/8520.html

according to the specs it does look like the PLCC can be substituted with the 40 pin DIP... if i can't find a PLCC then i basically got no choice but to build myself a little adaper board and get out the trustee Soldering iron and a huge magnifying glass

Anyone feel free to recheck my comparison of the 2 chips to see if they are indeed compatible

rkauer · 27 February 2009, 21:48

The chips are totally compatible, that's for sure.

Only different form factor.

Oh, and the PLCC chip was used on A600, 1200 and both versions of A4000 (desktop and tower).

Fingerlickin_B · 28 February 2009, 03:41

Quote:

Originally Posted by rkauer

The chips are totally compatible, that's for sure.

Only different form factor.

Yay, good news!

Have you got a "legged" CIA available Kipper?

PZ.

kipper2k · 28 February 2009, 03:58

i found a place in Germany that sells both, if i can get the PLCC i'll get that first... if no other options i will mod the DIP to fit, only thing is it will get in the way of the scandoubler i getting, so i trying to leave options open

kipper2k · 07 March 2009, 16:51

I got my CIA chip, soldered it on, was a little tricky on the back portion and the side with the plastic keyboard connector. I was going to use hot air but decided not to because of the heat so it was a case of tacking 2 opposite corners and then soldering the hard sides first then the easiest.
I had to revisit all the joints and then ...

Its Alive!!!!

All I/O options appear to be working good. Dont look at the plastic connector... i'm pretty sure it was like that before i started

DoogUK · 07 March 2009, 16:58

yeah we can see the plastic connector was already like that from the top photo

Fingerlickin_B · 07 March 2009, 17:44

Quote:

Originally Posted by kipper2k

Its Alive!!!!

Great news!

PZ.

Jope · 07 March 2009, 22:45

For the rest of you, I recommend a socket instead of soldering the new chip directly on there.. When you manage to burn your next CIA, you'll thank yourself. :-)

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27 February 2009, 04:40	#1
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	So here i am with nothing to do so i decide to remove the bad CIA chip off my 1200 after i fried it. I tried to remove the chip a little too soon and here is the damage... looks like the 2 pads i lifted are not used so hopefully no damage done... i guess i'll find out when i replace it ( as soon as i can find a replacement heres a closeup... http://www.kipper2k.com/images/closeup.jpg

27 February 2009, 05:46	#2
Fingerlickin_B Amiga Nut Join Date: Oct 2006 Location: Belco, Australia Posts: 2,242	Well it looks like more than two might not be used, which leads to this: I read in another thread that you are after a replacement CIA, but of course A600/A1200 CIAs are hard to come by. The A1200 CIA has 44 connection points, but it appears not all of them lead anywhere. The socketed CIAs (eg, A2000) have only 40 legs. If you can obtain pinouts/datasheets for both CIA types, you may very well be able to use the older style CIA with a bit of hacking (make an adaptor PCB, or even just run fly wires from the PCB directly to the legs of the "wrong" CIA. Now we wait for replies from those who would know if this is indeed possible PZ.

27 February 2009, 21:48	#4
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	The chips are totally compatible, that's for sure. Only different form factor. Oh, and the PLCC chip was used on A600, 1200 and both versions of A4000 (desktop and tower).

28 February 2009, 03:58	#6
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	i found a place in Germany that sells both, if i can get the PLCC i'll get that first... if no other options i will mod the DIP to fit, only thing is it will get in the way of the scandoubler i getting, so i trying to leave options open

07 March 2009, 16:51	#7
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	I got my CIA chip, soldered it on, was a little tricky on the back portion and the side with the plastic keyboard connector. I was going to use hot air but decided not to because of the heat so it was a case of tacking 2 opposite corners and then soldering the hard sides first then the easiest. I had to revisit all the joints and then ... Its Alive!!!! All I/O options appear to be working good. Dont look at the plastic connector... i'm pretty sure it was like that before i started

07 March 2009, 16:58	#8
DoogUK Doogster Join Date: Dec 2007 Location: Dorset Posts: 1,069	yeah we can see the plastic connector was already like that from the top photo

07 March 2009, 22:45	#10
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,921	For the rest of you, I recommend a socket instead of soldering the new chip directly on there.. When you manage to burn your next CIA, you'll thank yourself. :-)

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