>512k Fast RAM Extension Has never been common on Amiga 500. Perhaps you mean 512k SLOW RAM Extension. Or CHIP RAM (after a motherboard solder-jumper adjustm

>512k Fast RAM Extension Has never been common on Amiga 500. Perhaps you mean 512k SLOW RAM Extension. Or CHIP RAM (after a motherboard solder-jumper adjustment) with the ECS Agnus common in late A500 models.