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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Bokasa on August 06, 2013, 09:08:22 AM

Title: need advice: Amiga 3000D and Agnus
Post by: Bokasa on August 06, 2013, 09:08:22 AM

I need advice. May I temporary use it Agnus 8372A instead 8372B at my A3000D? With 1M chip RAM?
Thanks.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Jiffy on August 06, 2013, 09:13:28 AM

As far as I know the A & B versions are not pin compatible.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Bokasa on August 06, 2013, 09:17:44 AM

Quote from: jiffy;743781

as far as i know the a & b versions are not pin compatible.

8375?

Title: Re: need advice: Amiga 3000D and Agnus
Post by: magnetic on August 06, 2013, 10:55:20 AM

afaik you cant use a2000 agnus in 3000

Title: Re: need advice: Amiga 3000D and Agnus
Post by: psxphill on August 06, 2013, 12:06:12 PM

Quote from: magnetic;743787

afaik you cant use a2000 agnus in 3000

The agnus are basically all compatible. The main difference is the pin configuration, but that can be fixed using an adapter.
 
If you want one that will drop in then get one that is marked exactly the same (the year and week can be different but nothing else).
 
The 8372/8372A/8372B doesn't specify the pin configuration, there is another number that is used for that.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Oldsmobile_Mike on August 06, 2013, 05:27:54 PM

IMHO I wouldn't try it without a proper adapter.  Not worth the risk.

For starters there's a pin chart on Wikipedia, but even there it states that pinouts/usage are not consistent:

http://en.wikipedia.org/wiki/MOS_Technology_Agnus

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Zac67 on August 06, 2013, 08:18:02 PM

There are three different Agnus models (PLCC): the A500/2000 one, the A3000(T) one and the A500+/600 one (neglecting the PAL vs NTSC vs switchable detail). None or pin compatible.

alexh once collected details (http://eab.abime.net/support-hardware/21961-help-update-amiga-hardware-agnus.html) on them; possibly this is the most reliable source there is.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: magnetic on August 07, 2013, 03:24:44 AM

For a change I agree with oldsmobile. DO NOT risk a rare a3000 with hacking the agnus. Just get the proper chip.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: SACC-guy on August 07, 2013, 04:15:55 AM

Maybe the question really is...
How does the OP get 2 megs of chip memory in his 3000?

Didn't the 3000 agnus just need the dip memory moved from the fast side of the motherboard to the chip side of the board?

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Zac67 on August 07, 2013, 07:35:25 AM

Quote from: SACC-guy;743877

Didn't the 3000 agnus just need the dip memory moved from the fast side of the motherboard to the chip side of the board?

Yes, exactly. The 1 MB Agnus version (500/2000) won't work at all.

Title: Re: need advice: Amiga 3000D and Agnus
Post by: Bokasa on August 12, 2013, 09:50:29 PM

Thank you.