Difference between 391078-01 and 391078-02 CIA chips?

_Chrille_ · 23 September 2021, 07:34

Hi!

I was just wondering if there is any difference between these to versions of the CIA chips? Do they both with the A1200? I think I have only ever seen the 391078-01 on A1200 motherboards but 391078-02 is perhaps a later model of the chip used in later models of the A1200?

torsti76 · 23 September 2021, 07:57

Quote:

Originally Posted by _Chrille_

Hi!

I was just wondering if there is any difference between these to versions of the CIA chips? Do they both with the A1200? I think I have only ever seen the 391078-01 on A1200 motherboards but 391078-02 is perhaps a later model of the chip used in later models of the A1200?

The difference is that the -01 supports running at 1 MHz, the -02 at 2 MHz.
For Amigas, this is irrelevant, so you can use (and even mix) both variants.

Jope · 23 September 2021, 09:07

Get the 02, it is bug free
http://eab.abime.net/showpost.php?p=...5&postcount=11

torsti76 · 23 September 2021, 09:15

Quote:

Originally Posted by Jope

Get the 02, it is bug free
http://eab.abime.net/showpost.php?p=...5&postcount=11

They aren't particularly easy to obtain these days... ;-)

_Chrille_ · 23 September 2021, 12:45

Ok, great. Thanks for your replies!

So that means I could use any one of these but 391078-02 is preferred over 391078-01 because of a bug, right? How common is that bug? I mean, Commodore sold quite a few A1200's. If it was a serious bug the computer would probably not be as popular as it was. Was there any stock A1200's that were equipped from factory with the later 391078-02 chip?

Jope · 23 September 2021, 15:03

It's not very serious. The thread has some discussion about it. We lived quite long without knowing about it. :-)

23 September 2021, 07:34	#1
_Chrille_ Registered User Join Date: Dec 2020 Location: Sweden Posts: 13	Difference between 391078-01 and 391078-02 CIA chips? Hi! I was just wondering if there is any difference between these to versions of the CIA chips? Do they both with the A1200? I think I have only ever seen the 391078-01 on A1200 motherboards but 391078-02 is perhaps a later model of the chip used in later models of the A1200?

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23 September 2021, 09:07	#3
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Get the 02, it is bug free http://eab.abime.net/showpost.php?p=...5&postcount=11

23 September 2021, 12:45	#5
_Chrille_ Registered User Join Date: Dec 2020 Location: Sweden Posts: 13	Ok, great. Thanks for your replies! So that means I could use any one of these but 391078-02 is preferred over 391078-01 because of a bug, right? How common is that bug? I mean, Commodore sold quite a few A1200's. If it was a serious bug the computer would probably not be as popular as it was. Was there any stock A1200's that were equipped from factory with the later 391078-02 chip?

23 September 2021, 15:03	#6
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	It's not very serious. The thread has some discussion about it. We lived quite long without knowing about it. :-)

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