2mb chipram on A500 rev8

[Crossmanbx]

Hello all,

I have managed to find a web link on how to mount 4 chips of 1Mb on a rev 8 mb (2MB chipram), but unfortunately, I lost it...
This link provides a easy way to do it, only by changing jumpers, without the need of adding anything else (diode, multiplexer, resistor...). Almost like a rev 6.

Does anybody here could tell me how to do that ? Soj ram are already in place, just need exact position of the jumpers.

Thank you.

 

[Dale423]

Amiga 500 RAM

Amiga 500 - RAM hax - retrohax.net I needed to write a blog post showing different RAM hacks/configs on Amiga 500 8A motherboard to serve..

retrohax.net

 

[Crossmanbx]

Thanks but it's not what I'm looking for. I don't need demultiplexer because I'm using 1M X 4 ram chips.

 

[Chris_vs]

Hi!
Maybe this thread may help You?

Amiga 500 2mb chip mode done

Few weeks ago I made 2mb chip in my Amiga 2000 today is turn to Amiga 500 2mb chip mod here are few photos showing after mode done Amiga 500 work excellent mod is very simple and cheap

www.amibay.com

Best Regards
Chris

 

[Crossmanbx]

Yep ! This is what I've done and it works great ! But another thread somewhere in the net shows another easier way to do it on a Rev8, almost as easy as on rev6.

 

[Chris_vs]

Are You sure it is possible to do it without diodes ? I think You will need a demux then but maybe Im wrong...
Lotharek is selling something like this but there are those 1N4148 with resistors.

Lotharek.pl - Amiga 500 2MB CHIP RAM MODULE

Amiga 500 2MB CHIP RAM MODULE

lotharek.pl

There is also a installing manual with many photos in pdf when You click on "Files" section
Best Regards
Chris

 

[Crossmanbx]

Yep, I saw that but I've forgotten to put it in my favorites... If I manage to find it again, I'll forward the link.
It's very easy on rev6 with a good agnus, if I get time enough, I will have a look at the schematics.