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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Ral-Clan on February 20, 2013, 02:46:45 PM

Title: What are these motherboard mods?
Post by: Ral-Clan on February 20, 2013, 02:46:45 PM

Hi,

I have two revision 5 motherboard Amiga 500s. When I got them, both were pretty much identical ECS modded boards, installed with KS2.04 and fatter Agnus, OCS Denise.

But each board had a different motherboard modification done to it.  Both mods were in the vicinity of the Denise chip. One was a wire running to a transistor(?), the other was the addition of a resistor.

Here are pictures (red highlights the mod) - click on them to enlarge.

(http://s17.postimage.org/57l54amkr/Rev5_Mod01_copy.jpg) (http://postimage.org/image/57l54amkr/)

(http://s3.postimage.org/pa8lma4rj/Rev5_Mod02_copy.jpg) (http://postimage.org/image/pa8lma4rj/)

What do these mods do - and why different mods for a motherboards of the same revision?

Title: Re: What are these motherboard mods?
Post by: CritAnime on February 20, 2013, 03:11:51 PM

They look like factory mods for timing and such. It confused me first time I saw something similar in a 1200. Even though 2 machines have the same version number you can see quick fixes like these done.