Neuroth Hardware Design Mega 2/8

[Lurch]

Supposed to give 2MB Fast RAM for the Amiga 500, the mainboard connects to the trapdoor and the adapter connects to the Gary slot.

Have connected it all up but it is only seeing 512KB (1MB total including the 512KB on the a500), is there something I'm missing? The connecting wire is attached, there is a jumper on the mainboard I've tried this off and on.

I don't need to do the mem hack to A500, was thinking that would be only for chip ram?

http://amiga.resource.cx/exp/neuroth502

[Lurch]

Hmm I've got a 1 Meg Angus installed, it only sees 512KB of the RAM on the mega 2/8. Will have a look at the baseboard software.

Have checked the RAM on the mega 2/8 and it's fully populated.

Thanks for the info, time for another play :-)

[Lurch]

Says 1 meg angus so should that mean I see 1 MB from the ram addon?

Will find out when I try that software. Might do a google to see if I can track down workbench command.

[Lurch]

I've got the expansion in the trapdoor slot with 2MB fast ram on that board but it's only seeing 512KB of that board.

Was thinking the RAM mod was for 1MB or more chip RAM not fast?

The A500 has a 1 Meg Angus. So I'll have to mod Jp2 and work out where to connect a wire to the Gary addon board to see the 2MB fast RAM?

There wasn't another wire with it other than the one that connects the gary addon to the trapdoor card.

Found some Workbench commands here:

http://winuaehelp.back2roots.org/background/amigados.htm

But nothing about RAM.

[Lurch]

Hmm, going to start simple. Checking the gary adapter make sure thats all okay but will start there as going by what I've read it should autoconfigure, well atleast to 1.8MB.

Also with the chip ram mod doesn't that disable the trapdoor?

[Lurch]

Well after trying just about everything, and even comparing the setup I have with the pictures on the amiga hardware databse for the card it's still only seeing 512kb.

So guess I'll just use it as a 512kb card for now ;-)

[Lurch]

Well after all that tried it on another A500 (both 6a boards) and it works fine. 2MB, well 2.5 including the onboard RAM.

So it was the board limiting it to 512KB. :-)