Amiga 2000 rev 6.3 2mb chip MOD DONE :-)

Deling

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Here are fotos Im happy :)very cheap 2 mb chip :)

speciall thanks for Amibayer Sveta for AGNUS 8372B
 

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Deling

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after assembly , now I have full ECS DENISE 2 mb chip Agnus because I replaced old OCS with New ECS chip


I'm lucky because now Cannon Fodder 1 whdload version work excellent


before MOD with 1 mb chip doesn't worked because need 1.5 mb chip for run this game
 

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Juri

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hello i've the same mb revision, could you share the schematics of mod please? i would like to do it to my A2000
thanks
 

scoobyatgb

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That looks great so can you get fast ram on there as well and we're would you get a 8372B agnus chip from what amigas was they in
 

Deling

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Baterry ? it is done my friend few years ago there is 1N148 diode clock work great
 

Deling

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sorry I dont understand you
Clock work excellent for few years , I dont know what you mean


diode 1n148 is enough to prevent overload battery my friend


remember that , theory is not always the same like practice
 
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Marmes

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Diode just keeps the batery being charged, not overload. let me explain, I tested both situation, so practically speaking, a schottky diode is better:)
A normal silicon diode needs 0.6 to 0.7V to to start conducting, it works as a battery. On a schottky diode, you only need 0.3V to do it. So when you you turn off your computer , RTC uses a 3V battery , 1n4148 takes 0.6V, wich makes the rtc working with only 2.4V, it will take less time to discharge with that diode. With a schottky it only takes 0.3V, making the rtc work with 2.7V, wich will live more time. You have that explanation from the same site we took the 2mb chip mod.
 

Deling

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okay now I understand , you have right mate , but is to late for me , I haven't power for disassembly mi Amiga 2000 again :) he he
 
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