Posted By
SVS
on 2003-04-16
 |  From documentation:
"The 7501 and its bigger brother, the 8501, were really just refined 6510s manufactured with Commodore's new HMOS (High-Speed NMOS) process. The 7501 was made using HMOS-1; the 8501 was made with HMOS-2 (a logical step to indicate the 6500s were made with the original NMOS process). Extra pins were added to the on-chip I/O port to accomodate the 264 series' more complex memory banking.
Some of the apparent differences between the 6510 and 7/8501 are actually board-motivated; for example, (intriguingly) there is no way to generate an NMI on the Plus/4, and probably any other 264 series computer, despite the fact the 7501 does accept NMI signals."
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