| Posted By
Dunric
on 2003-04-13
|  7501 vs. 8501?
What are the differences between the 7501 and 8501 microprocessors? I seem to recall a Compute! article that elaborated on the differences between the 6510, 7501 and 8502.
Paul (Dunric)
dunric@yahoo.com
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Posted By
Csabo
on 2003-04-13
| Re: 7501 vs. 8501
I'm definitely no expert on the subject, but I do know the following, which is what I learned from TLC's posting on the Hungarian forum.
The 6xxx, 7xxx, 8xxx designated the semiconductor technology. Only the first series was produced with 7xxx chips. Shortly after Commodore switched to another technology (8xxx chips), called HMOS II.
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Posted By
Bionic
on 2003-04-15
| blerch
I believe the 8xxx series is a shrink of the 6xxx and probably 7xxx series. 8xxx is 5um, while the others are 7um or 6um. Newer technology -> faster, less heat, cheaper.
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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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