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- Where to buy a 6502 chip - Retrocomputing Stack Exchange
I want to purchase a 6502 40 pin CPU in order to verify if my 6502 is faulty, I've seen I can buy from Hong Kong but would prefer closer (to the UK), RS and CPC don’t seen to have any Most answers suggest trying a 65c02 processor but these all seem to run at a far greater processing speed than my 6502 clocked at 0 75mHz, Would a 65c02 even work?
- Comparing raw performance of the Z80 and the 6502
A lot has been said on the internet about the 6502, at 1MHz, being roughly equivalent in performance to the Z80, at 4 MHz It is said the Z80 has a typical 4 clock ticks per instruction, while the
- Were there 6502 revisions B and C, and what were they like?
So this naming implies there ought to exist revisions B and C, which presumably were done to fix other problems, or add other features, but I can't seem to find much information about this So the question is, what are 6502 revisions B and C, and what are their differences from revision A?
- Why did so many early microcomputers use the MOS 6502 and variants?
Quite a few successful early microcomputers used the MOS 6502 CPU This included, but was not limited to, systems like the Apple I, Apple II, Commodore PET, and Ataris A followup known as the MOS
- Is there a standardised 6502 assembly syntax?
10 Is there an standardised 6502 assembly syntax? Not really While MOS' own Cross-Assembler might have been a base, it was way too primitive to be be considered Still, there is a line that can be followed from that cross assembler over the KIM resident assembler and various Commodore CBM assemblers all the way to more recent implementation
- 6502 - Why does the BRK instruction set the B flag? - Retrocomputing . . .
On the 6502, the brk instruction is a software interrupt Like any other interrupt, it pushes the status word to the stack and then the program counter, before transferring control to an interrupt
- Why didnt the 6502 have increment decrement opcodes for A?
In 6502 Assembly, we can use INX and INY to increase the value stored in X and Y They can be decreased with DEX and DEY However, it seems that there are no such instructions for A, like INA or DEA
- 6502 - Why were there no 32-bit versions of 65xx CPUs, or 64-bit . . .
A RISC based implementation of the Apple II 6502 Processor: In mid ’85 I performed an analysis that showed a simple RISC style implementation of a 16‐bit binary compatible superset of the 8‐bit microprocessor used in the Apple II 6502, along with some judicious use of on‐chip caching, could substantially improve performance – to the
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