DKB 2 meg agnus upgrade on a 512k chip A500

[Dandy]

I have a 2 meg DKB Agnus upgrade with the 8375 and was thinking about upgrading a Rev 5 A500 I have. I started thinking about, since the DKB only has an additional meg, am I going to end up with only 1.5 Megs of chip memory?

I'm not familiar with the DKB version, but I have the MiniMegiChip, which is quite similar. It had an "Denise adaptor" to integrate the 512 kB built in RAM and annother 512 kB from the Trapdoor RAM.

I recall there was a hack to allow the A501 add on card to be used as chip memory Is this legit or just a passing legend?

Not sure about that.

I have an A530 turbo that I am attempting to resurrect (missing the HD) and thought it would be a fun project to get an A500 with 2 megs of chip, 8 meg fast with the 030 precessor, booting with Kick 3.1 / WB 3.1.

I had an 1.8 mB Ram expansion in the trapdoor and a "SupraRAM 8mB" at the Expasion port. Together with the 512 k of the built in RAM of the A500 I had 2.3 mB + 8 mB = 10.3 mB. But this also required an "Denise adapter" for the trapdoor-RAM.
This way I had 2 mB CHIP RAM + 1.3 mB Trapdoor-RAM + 8 mB Fast RAM = 11.3 mB total RAM.

[Dandy]

...
Wedging all that stuff into an A500... you're going to want a beefier power supply for sure, which an A2000 already has. There's definitely a coolness factor to pimping out an A500 though - so you're going to have to decide if that's something you really want to do. Stuffing a HD in an A500's case is kind of BS too, since you have to remove the A500's floppy drive. There goes part of the coolness or feel of the machine - unless you somehow wedge a 2.5" drive in there somewhere.

IIRC, there were two different PSUs for the A500s.

Initially they came with a "heavy" one that had a big transformator in it. Those had enough power for my heavily expanded A500.

Later they came with a "light" switch-mode power supply, that was not powerful enough for heavily expanded A500s.