Upgrade Ram to 1 MB Amiga 500?

[Jope]

You do not have to solder the chips into the motherboard for 1MB chip. That's a lot of trouble and you'd lose the trapdoor anyway if you did that

• , so why bother.

You can just plug in the trapdoor expansion, then you need to reconfigure two solder pad-style jumpers on the motherboard.

Also a 1MB capable Agnus is needed. On a Rev6 A500, this is almost guaranteed, on a Rev5 you need to upgrade the Agnus.

Look at aminet docs/hard for the instructions.

• it is possible to retain trapdoor slow RAM at $C00000 and have 1MB of chip RAM on the motherboard, but that is a more involved hack.

[Jope]

If you drop a 2M Fat Agnus into this socket, it will work

Are you absolutely sure about this?

I haven't verified the pinouts myself, but I seem to remember that they are not compatible enough to just be dropped into a rev6 or earlier A500.