VinzTech

Amiga 500 512KB to 1MB internal RAM upgrade Step 1: Check if your A500 PCB supports RAM upgrade  Some Amiga 500 revisions have room to expand the internal Chip RAM to 1MB, up from the original 512KB. My REV6A PCB has this option. You can see the empty RAM slots here: Step 2. Acquire the right RAM chips I've found some cheap Siemens HYB514256B-70 chips. The original ones on the motherboard are HYB514256b-60 (little bit faster, but not required for the A500). Another compatible chip is the TI TMS44C256-10N. You will need 4 of these chips. Step 3. Solder the RAM chips (or the sockets) Once you have the RAM chips, you can either solder them directly on the motherboard, or solder sockets and fit the RAM chips in the sockets (like I did). You can see 3 out of 4 sockets have the new RAM chip populated. Optionally power up the Amiga right now. Your new RAM won't be recognized yet, but the Amiga should boot, and the RAM chips should not get hot. If they do, they are broken or something