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My 2nd A500T pic 01
My 2nd A500T pic 01
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Description: This is a "before" shot of the Amiga 500 motherboard that I will be installing into my 2nd Amiga 500 Tower.  It is a Revision 6.
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Posted by: nscaleworld at July 10, 2012, 03:57:02 AM

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nscaleworld
Posts:101
July 10, 2012, 04:39:01 AM
This is the motherboard that I am installing in my new Amiga 500 Tower. It is a revision 6.

I will be doing the following to this board:
  • Clean the board
  • Replace 68000 cpu with higher quality ceramic version
  • Solder four 20-pin ic sockets and four .01 uF capacitors
  • plug into the 4 new sockets four German-made 44256 DRAMs
  • Cut trace near Agnus chip
  • Locate the thru-holes connected to those pads
  • solder 3 wires to those thru-holes and a spdt switch to the 3 wires
  • Unsolder all of the main capacitors
  • Replace those capacitors with high quality Nichicon capacitors
  • Replace the 2 caps in the audio circuit with Nichicon audio caps
  • Reseat all socket chips
When this work is complete, I will upload an "after" picture. The SPDT switch is so I can switch between 512k chip ram and 1 meg chip ram. Most classic Amiga games run the best on 512k chip / 512k fast ram setup, so this will be the default. But, I also love to play Amiga MOD music, and some mods require 1 meg of chip ram. Since most classic Amiga games work the best with Kickstart 1.3, I will not change it. There is a high quality Kickstart 1.3 rom, made by NEC, already plugged into the kickstart rom socket.


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