Editing MOS Technology 6510 (section)

==Variants==
[[Image:6510 CPU Pinout.svg|thumb|300px|Pin configuration of the most common variation of the 6510 CPU (/HALT in this image refers to the RDY pin.)]]

=== MOS 8500 {{anchor|8500}} ===
In 1985, MOS produced the '''8500''', an [[HMOS]] version of the 6510. Other than the process modification, it is virtually identical to the [[NMOS logic|NMOS]] version of the 6510. The 8500 was originally designed for use in the modernised C64, the C64C. However, in 1985, limited quantities of 8500s were found on older NMOS-based C64s. It finally made its official debut in 1987, appearing in a motherboard using the new 85xx HMOS chipset.

=== MOS 7501/8501 {{anchor|7501|8501}} ===
[[File:MOS8501R1.jpg|thumb|MOS 8501 CPU]]
The '''7501/8501''' variant of the 6510 was introduced in 1984.<ref name="auto">[http://plus4world.powweb.com/hardware/MOS_75018501 Hardware – MOS 7501/8501]</ref> Compared to the 6510, this variant extends the number of I/O port pins from 6 to 8, but omits the pins for non-maskable interrupt and clock output.<ref>[https://ist.uwaterloo.ca/~schepers/MJK/7501.html  CPU 7501 / 8501]</ref>   It is used in Commodore's [[Commodore 16|C16]], [[Commodore 16|C116]] and [[Commodore Plus/4|Plus/4]] home computers, where its I/O port controls not only the [[Commodore Datasette|Datasette]] but also the [[Commodore 1541#Interface|CBM Bus]] interface. The main difference between 7501 and 8501 CPUs is that they were manufactured with slightly different processes: 7501 was manufactured with [[HMOS|HMOS-1]] and 8501 with HMOS-2.<ref name="auto"/>

=== MOS 8502 {{anchor|8502}} ===
{{mainarticle|MOS Technology 8502}}
The 2&nbsp;[[Hertz|MHz]]-capable [[MOS Technology 8502|8502]] variant is used in the [[Commodore 128]]. All these CPUs are [[opcode]] compatible (including [[illegal opcode|undocumented opcodes]]).<ref>{{cite web|url=http://www.oxyron.de/html/opcodes02.html|title=6502/6510/8500/8502 Opcodes|last=Graham|website=www.oxyron.de}}</ref>

=== MOS 6510T {{anchor|6510T}} ===
The [[Commodore 1551]] disk drive (for the [[Commodore Plus/4]]) uses the '''6510T''', a version of the 6510 with eight I/O lines. The [[Non-maskable interrupt|NMI]] and RDY signals are not available.