This manual relates to the MOS 6509 used in many Commodore products.
The big brother to the 6502 (used in the Commodore PET) was used in
Commodore 64 and the B-Series / CBM-II line among others. This manual
is from October of 1986. General information on all of the
650x line is available
in our History tab.
is a low-cost microprocessor capable of solving a broad range of
small-systems and memory management problems at minimum cost to the user.
A memory management system allows for up
to One Mega-Byte of memory of ease in down loading languages, operating
systems or other data.
The Three-State sixteen-bit Address Bus
allows Direct Memory Accessing (DMA) and multi-processor systems sharing a
common memory while the Four-bit Extended Address Register allows for up to
a one Mega-Byte of data storage.
The internal processor architecture is
identical to the Commodore Semiconductor Group 6502 to provide software
This graphics below were converted from a
large .PDF on
Richard Cini's excellent site. It was reproduced October 17, 2002
with permission granted in July of 2002. Thanx again Richard!