Where to buy a 6502 chip - Retrocomputing Stack Exchange
Jun 6, 2020 · 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 …
Why did so many early microcomputers use the MOS 6502 and variants?
May 14, 2017 · 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 …
Comparing raw performance of the Z80 and the 6502
May 21, 2022 · 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 …
How similar were the MC6800 and MOS 6502?
Sep 25, 2024 · 5 While the 6800 and the 6502 are quite similar at a basic technology level, their different levels of commercial success suggest that the better-optimised ISA of the 6502 was an advantage. …
Were there 6502 revisions B and C, and what were they like?
Aug 13, 2023 · 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 …
Carry handling during address generation on a 6502
Jul 20, 2022 · 12 I'm trying to learn a bit more about the internal workings of the 6502. The manual says that the branch instructions do not affect the carry flag. However, my understanding is that some …
Why didn't the 6502 have increment/decrement opcodes for A?
Dec 11, 2019 · 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 …
6502 - Why does the BRK instruction set the B flag? - Retrocomputing ...
Apr 24, 2024 · 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
Can the 6502 clock be changed on the fly?
Nov 30, 2021 · the 6510 is a 6502 in NMOS with an on board 6 bit parallel port. the 7500 is a 6510 in HMOS (licenced from Intel). the 7501 is a 6510 in HMOS with full 8 bit port as used for the TED …
What is the MOS 6502 doing on each cycle of an instruction?
Feb 7, 2021 · 11 Assuming you’re asking: what can the 6502 be seen to be doing by an external observer, then the data sheet has a full breakdown of bus activity per cycle per addressing mode; …