Variants
In 1985 MOS produced the 8500, an HMOS version of the 6510. Other than the process change, it is virtually identical to the 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.
The 7501/8501 variant of the 6510 was used in Commodore's C16, C116 and Plus/4 home computers, where its I/O port controlled not only the Datasette but also the CBM Bus interface. The 2 MHz-capable 8502 variant was used in the Commodore C128. All these CPUs are opcode compatible (including undocumented opcodes), except the 8502, where some differences concerning the undocumented opcodes have been reported.
The Commodore 1551 disk drive used the 6510T, a version of the 6510 with eight I/O lines. The NMI and RDY signals are not available.
Read more about this topic: MOS Technology 6510
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