aplmak said:

So 5120 can only go to 8MB total and 5126 to 9MB total.. You are testing on a 5120.. You should test on a 5126 board and bring it up… Perhaps my 5126 board.. heeee….

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Backlit needs the /AS jumper. Without it it only sees 5MB. with it I can get all 8MB.

However there is an odd bug. When an application goes into expanded RAM the backlight flickers on and off rapidly with RAM accesses.

If I dont use the /AS wire and cap it at 5mb its perfectly fine.

But my /AS wire was a horrendously long clip lead plus I didnt have /DTACK hooked up either, so that could have been an issue.