.... if the attacker knows the password hash that is not a dictionary attack.
The classic dictionary attack is to retrieve the list of password hashes and backwards compute to try and match common passwords to the known hashes, thus rendering a list of known passwords to use. The accounts are then compromised. Calling a modified brute force attack a dictionary attack is also common but a bastardization of the real thing.
I don't see how that would work here.
Maybe you are thinking of a brute force attack?
It's the chip that does memory access, fat agnus allows 1mb to be used for video and so forth, original agnus allowed access to 512k. I actually had to pull the old agnus out and insert the upgrade part in the 1980s.