Howto mod an Amiga 500 Rev8A motherboard to a fully fledged Amiga 500 Plus - jbilander/HowTos GitHub Wiki

Howto mod an Amiga 500 Rev8A motherboard to a fully fledged Amiga 500+

How to do this mod is very well explained here:

http://eab.abime.net/showthread.php?t=77705

I will use ultra-flat dip-20 sockets for the four empty onboard RAM positions, and one dip-18 socket for U32 (doesn't need to be ultra-flat but mine was). The reason for the four ultra-flats is for the RAMs to clear the A500 keyboard.

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The untouched board looked like this:

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Removing all solder from holes and pads using my desolder station ZD-915

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Adding the ultra-flat sockets and DRAM chips (256k x 4 bit):

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Solder pads fixed

• JP2 - bottom 2 pads blobbed together
• JP3 - top left and top right pad blobbed together, bottom left and bottom right blobbed together
• JP7A - leave open
• JP9 - do not touch

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keyboard clearance, check!

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Removing and replacing capacitors

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Final Result with MC74F139N added to U32: