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JLPedro
11th March 2010, 10:41
As the title says, looking for a replacement Agnus chip for a Rev.6A motherboard (OCS).
The motherboard gives green screen at boot and leaving it on for a bit the only chip that gets warm is the Agnus, so i'm assuming it's Agnus that's broken and not chip ram ;).

rkauer
12th March 2010, 15:34
Do you need what version of Agnus? 8370, 8371 or 8372A?

8370 is the NTSC version, 8371 is the PAL-only counterpart. Doesn't matter what you do with traces in the A500 motherboard, those will give you only 512kb of chip RAM.

Trapdoor RAM will be slow-fast RAM.

The 8372A is the universal 1Mb chip Agnus.

J.T.Kirk
12th March 2010, 15:35
The 8372A is the universal 1Mb chip Agnus.

Yes, but with that, you will need the MiniMegiChip right?

rkauer
12th March 2010, 15:52
Double post! Bad ADSL! Bad! Bad ADSL! No food for you today.

J.T.Kirk
12th March 2010, 16:04
Are you drunk m8? :blink:

JLPedro
12th March 2010, 16:55
Sorry, I mean the universal 8372A or I can take a Fat Agnus.

rkauer
12th March 2010, 17:33
Sorry, bad ADSL connection.:Doh:

The 8372A is the universal 1Mb Agnus. It configures itself as NTSC or PAL.

Grounding (PAL) or routing pin 41 to +5V through a 220Ohm resistor (NTSC).

8372AB and most 8375 Agnii are 2Mb. For using one of those you need a MiniMegiChip or Megachip.

JLPedro
12th March 2010, 18:01
Humm, then I'm just looking for a 8372A.

CtGuy1955
13th March 2010, 07:59
I am humbled by your knowledge of Amiga computers with the drinking that you do. I started drinking in 1966 because my friend Lou's Dad made wine
for the dinner table, and it was always dinner time. So by the time 82 came around, I was an expert drinker, and had bought a Atari 400 and was playing games. Then on to the Commodore 128, and then the Amiga 500 in 88. I spent 3 grand on that baby.....and its sat there for many years now.

I have been building my own PC's for many years, but the Amiga 500 will always have a special place in my heart and a emptiness in my wallet. No sooner did I trick out my 500 and they come out with 2000 and the toaster and put me to shame. I remember going to a mall where they had a headset and virtual reality gun thing, and it was so kewl back then. It ran off of an Amiga 2000 or whatever, but I dont know if the head set used two small sony tv sets or what, but I loved it and cant understand why now we dont have fantastic games by now. Around 1990 I paid 800 bucks for the one meg hard drive with some ram A-530, and now you could get 4 "2" tb hd's for that!!!

I loved my flight sims back then, and around 93 or so, many started leaving the amiga scene and going with PC. Such a shame.

Practice your drinking, and someday you can be as forgetful as me !!!

rkauer
13th March 2010, 17:39
CtGuy1955: neat story, but it fits more into the general chat area, not in a commercial thread.

Heavy drinking, huh? I dislike competition!:mad:

Medic
13th March 2010, 18:35
Blimey!

All this drinking over an Agnus chip...

Oh well, if you can't beat 'em, here goes another can :)

JLPedro
13th March 2010, 19:13
I just want an Agnus 8372A Agnus... Anyone :please:?

PS: :butcher I'l chop the head of the next guy that comes drunk to my thread...;).

Amiga-Digital
14th March 2010, 12:04
I just want an Agnus 8372A Agnus... Anyone :please:?

PS: :butcher I'l chop the head of the next guy that comes drunk to my thread...;).

Hi, i have some Agnus New 8375 - 318069-16 1MB

JLPedro
14th March 2010, 12:46
The 8375 is Fat Agnus if i'm correct and for that i need minimegachip...

Amiga-Digital
14th March 2010, 12:50
The 8375 is Fat Agnus if i'm correct and for that i need minimegachip...


so you need the 8372A thats no problem i found it here

the 8375 i use some of then in the 2000's that i have here

rkauer
14th March 2010, 17:30
A-D is right the 8375, albeit the code, is a 1Mb part and suitable for A500 and A2000.

JLPedro
21st May 2010, 19:31
Agnus chip found, but motherboard as more issues than first tought, still gives green screen with new agnus :(.
After a closer inspection to the motherboard i can spot some soldering done on some components :mad:, will put this on the shelf, maibe when have more free time i pick it up again.

Please close this thread please :thumbsup:.

Thanks all for help, JP