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View submission: I'm still struggling understanding RAM types/upgrades for OCS 500.
A stock A500 (not plus) has 512kb chip. Chip ram is ram that is also accessible for the graphic and sound chips, meaning it is where you should store and graphics and sound that is in use, but it can also be used for everything else. Essentially it is somewhat similar to "shared" ram you see on some budget pcs with integrated graphics, where the graphics don't have it's own ram but it can use some of the normal ram.
A typical trapdoor expansion adds 512 "fast" ram. It can not be used directly for graphics or sound, but for anything else. This can also be used as chip ram, depending on your revision of the A500. If you have a Fat Agnus chip and you are handy with a soldering iron you also make this into chip ram.
A sidecar expansion can add fast ram, which is similar the the one in the trapdoor but faster, and can't be used as chip.
My 500 back in the day originally had Kickstart 1.3 and a 512 kb expansion. I later replaced the Kickstart with 2.0, converted the expansion to chip, and added a GVP sidecar expansion with 2mb fast ram and a 52 mb hard drive.
There's nothing here!