CPU 6510-Register set
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- A 16-bit Program Counter (PC or IP)
- An 8-bit Status Register, sometimes called .P
- An 8-bit Accumulator, or .A
- Two 8-bit Index Registers, .X and .Y
In addition, and unlike the 6502, the 6510 has an 8-bit bi-directional data port which is permanently memory-mapped at locations 0 & 1. On the Commodore 64, this port is used for Datasette I/O and controlling the memory banking of the system.