I need more RAM in my A500.

[motrucker]

And??

That makes it rather hard to use an GVP HD8+ unless he gets a slingshot. That was my point. It's not impossible, but most A500 users aren't going to want to fool with it.

[orange]

@alexh
I've got this one: http://hardware.amiga.hu/exp/zydec515  in A500.

it's certainly more than 512K (but requires that already mentioned adapter)

[Tenacious]

You may not care, but, I'd go for TRUE fast ram.  

Ram that goes into a 32-bit accelerator and ram in a sidecar (like Supra 500RX) is usually true fast ram (the CPU does not have to wait for access to it).

Ram that mounts in the trapdoor (AdRam, etc) is all slow ram (addressing is derived the same as chip ram, the CPU must wait it's turn).

The Supra 500RX is smaller, very compatible, and not too hard to find. It can host 2, 4, and 8 Megs of true fast ram (8 megs may not be compatible with other side expansions).

I wish Supra had combined their 500RX, Turbo 25 MHz, and SCSI interface in one device, grin.

[whiteb]

IIRC, there was 2Mb limit on trapdoor expansion, but I'm not sure.
and with 2Mb Agnus, it would give you that amount of RAM..

if money is such a problem, then go for A600 with that russian 8Mb..

Then you remember INCORRECTLY.

I have an A500 Trapdoor expansion, takes 4 1MB simms.

Can be configured for 2MB of Chip (with a 2MB Agnus), and 2.5MB of Fast (Amongst other configs.)

Was made here in Australia, called "AxRam 4".  I did submit it to one of the Amiga Hardware sites, but cannot find it at the moment.

[edit] http://www.bboah.com/index.php?sid=3287&lang=en&action=artikel&cat=69&id=3175&artlang=en

[motrucker]

Here is 4Mb expansion board being sold by none other than our very own redrumloa. Very fair price IMHO. Here's the eBay link;

http://cgi.ebay.com/BaseBoard-4MB-RAM-Expansion-for-Commodore-Amiga-500_W0QQitemZ400064053127QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5d25acff87&_trksid=p3286.c0.m14

I hope this helps some one.

[SilvrDrgn]

The AdRAM 540 will take you way beyond 1Mb. The 540 and 560 together may get to 4Mb. The Baseboard is another bigger than 1Mb expansion for the A500. Just because they don't use SIMMs doesn't mean they are limited to 1Mb!!
An ideal setup would be a mega midget racer with a 4Mb SIMM on it. There are a couple of accelerators besides this one that allow more RAM.
Here are the specs on the AdRAM cards: http://www.amiga-hardware.com/showhardware.cgi?HARDID=1015
Looks like 3.8Mb is the most you can get from this trapdoor expansion.

Actually, AdRAM 540/560 combination will take you to as much as 6MB of RAM in a properly configured A500.  I've got that and a little more in my A500 since I also have a "sidecar".  See here - http://mikerye.homeip.net/about_my_computers.html

[motrucker]

Actually, AdRAM 540/560 combination will take you to as much as 6MB of RAM in a properly configured A500.  I've got that and a little more in my A500 since I also have a "sidecar".  See here - http://mikerye.homeip.net/about_my_computers.html

I was sure it would get to at least 4Mb. The BaseBoard will get to at least 4Mb too.
I used to have an A500 years ago with the AdRAM 540, with 2.04 ROMs (they were new at the time!) and a GVP A500+ Series II hard drive & RAM. It was a pretty good system - very stable.