Table of Contents
How many instructions does 6502 have?
Of the 256 possible opcodes available using an 8-bit pattern, the original 6502 uses 151 of them, organized into 56 instructions with (possibly) multiple addressing modes. Depending on the instruction and addressing mode, the opcode may require zero, one or two additional bytes for operands.
Which is better 6502 or Z80?
The 6502 was about 3x-3.5x faster than the Z80 at the same clock speed (therefore, the Z80 was usually used with a higher clock speed). Overall, it was / is much nicer to program. The 6502 was derived from the Motorola 6800, and the Z80 was derived from the Intel 8080.
Is Z80 faster than 6502?
Generally speaking, Z80 is two to three times slower than 6502 since its fastest instruction is 4 cycles and 6502’s is just 2. Then, if you take into account additional instruction bytes and memory addressing, Z80 looks like it’s completely behind. But things in real life differs a bit.
How many transistors did the 6502 have?
Microprocessors
| Processor | MOS transistor count | Designer |
|---|---|---|
| MOS Technology 6502 (8-bit, 40-pin) | 4,528 | MOS Technology |
| Intersil IM6100 (12-bit, 40-pin; clone of PDP-8) | 4,000 | Intersil |
| CDP 1801 (8-bit, 2-chip, 40-pin) | 5,000 | RCA |
| RCA 1802 (8-bit, 40-pin) | 5,000 | RCA |
What is the stack 6502?
The stack is a Last In First Out (LIFO) data structure used directly by the 6502/6510 processor to store and retrieve processor words (bytes). The memory area works in tandem with an 8-bit register in the processor called the Stack Pointer.
Is Z80 still used?
Z80s are still used even today, where a high-power processor isn’t needed. Many Texas Instruments graphing calculators still use Z80 processors today, as well as many other low-cost devices that need a little processing power.
Is the 6502 pipelined?
The 6502 was pipelined and the Z80 as well. Pipelining used to refer to the fact that instruction were performed piecemeal in a number of stages requiring multiple clock cycles as opposed to performing the entire instruction in one very long clock cycle.