1.5Mb Upgrades were available for regular A500s. I have one in mine. A500+ Models could have 1mb Chip, 1mb Slow. A500s upgraded to KS1.3 (like mine) could use 0

1.5Mb Upgrades were available for regular A500s. I have one in mine. A500+ Models could have 1mb Chip, 1mb Slow. A500s upgraded to KS1.3 (like mine) could use 0.5Mb Chip, 1.5Mb slow.