Neuroth Hardware Design Mega 2/8

[omnicron10]

I think you need to run a command to add the memory.  On the adram and baseboard ram board that use the same kinda of expansion method require software to get the extra memory working.  The Adram can see some of the ram without it and the baseboard requires a PAL upgrade (a chip, not the screen mode) if you have a 1 meg agnus to see any ranger fastram at boot otherwise it is only 512k.  

That board MIGHT not see any until you run a command to address and add the ram to the system.

Try the baseboard software that adds the ram to the system at this link.

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

Just an idea.

[omnicron10]

So you see 512k on the MB and 512k on the expansion board for a total of 1 meg of chip and nothing more?

That is what the baseboard does as well without the PAL upgrade and no software command.

The Adram supports more autoconfig ram with 1 meg agnus but still needs software to see the last 2 megs.

I think the software is generic for this application. I think if the baseboard software does not work then you can use a workbench command that adds ram but I dont remember the command or the syntax.

[omnicron10]

So avail show 1 meg of chip ram?

Unless you have a A500+ the amiga has 512k of ram on the MB.  Some of the later a500s had space for 512 more but it was un-populated.

With a 1 meg agnus (8327A) you need to cut a jumper on JP2 to get the Agnus to see more than 512k of chip ram.

With an Adram and Baseboard (similar devices) you would have to run a wire from the cut JP2 (located on the left side of the 68k) to the Gary daughterboard to see ram with 1 meg of chip.  I would imagine yours would be the same.

http://www.l8r.net/technical/t-agnus-installation.shtml

I am guessing you have 512k of chip and 512k of fake fast (ranger memory) aka fast ram that is on the bottom expansion slot of the A500.  They call it fake fast since it has to be accesses by the CPU via the custom chips and this is as slow as chip ram.

[omnicron10]

No.

NORMALLY with these type of expansions EVEN with a 1 meg agnus you will not see 1 meg of CHIP ram without the JP2 mod.  

When you do that MOD with these types of expansions they allow you to ONLY see 1 meg of chip (512k on the board and 512k on the expansion board).  To see more ram you have to run a software command.  The Adram540 will let you see another 1 meg of fast ram in addition to the chip ram.  The baseboard requires a PAL upgrade to see some more fast ram and software to see all of it.

If you dont have the 1meg CHIP ram mod done and you have one of these expansion you will ONLY see 512k chip ram and 512k fake fast from the expansion board.  

When you run the software command the other fast ram is seen.

See this thread.

http://www.amiga.org/forums/showthread.php?p=572103


That is why I was asking if you actually had 1 meg of chip ram or just the 1 meg agnus.

You want to buy a Adram 540?

[omnicron10]

It can be done autconfig for some of the memory in the ranger address space but the two board I know and have personally used (Adram and Baseboard) REQUIRE software to get all the ram working AND or required hardware updated to get more memory working once a 1 meg of chip ram mod was done.

You can read the baseboard and adram  docs.  The way the ram is enabled is only related to the address space of the ram.  If it is addressed in the same area then the software might work.

The board that lurch has does not have any docs online or software  online that I can see.  I am giving my best guesses to help him out. If we had docs for the board then we could make better guesses.