1. The Z80 can run quite complex programs without any external RAM because of its relatively large number of internal registers unlike the 6502 which has just a few registers and is reliant on page $0 (00-FF) memory to provide full functionality.
This fact is great for Z80 test and servicing programs where faulty RAM can be easily detected.
2. Comparisons of their clock rates are irrelevant because they both operate from different timing schemes.
The 6502 timing scheme makes it easy to accomplish shared memory access without any contention (but requires double speed memory to do so).
1. The Z80 can run quite complex programs without any external RAM because of its relatively large number of internal registers unlike the 6502 which has just a few registers and is reliant on page $0 (00-FF) memory to provide full functionality.
This fact is great for Z80 test and servicing programs where faulty RAM can be easily detected.
2. Comparisons of their clock rates are irrelevant because they both operate from different timing schemes.
The 6502 timing scheme makes it easy to accomplish shared memory access without any contention (but requires double speed memory to do so).
