2020年6月8日 · 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?

2017年5月14日 · 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 6510 was used as the main CPU for the Commodore 64 (the floppy disk drive used its own 6502), and variants of these were used in many other ...

2019年6月3日 · I'm trying to make a 6502 replica in Logisim. I want to know what exactly each control signal in 6502, how the clock cycles work and additionally I would like to see an example of these control signals producing a single instruction from start to finish. Is there a book about 6502 or other processor that goes in depth about it's control signals?

2022年12月7日 · I want the serial Port to connect to a modern Computer for a Keyboard, to send 6502 Assembly code files directly into the CPU's memory and to troubleshoot the Computer easily. However, I'm confused on exactly how I can connect the 9 Pins of a Serial Port to a 6522 Via's 8-Bit I/O pins and I have some other questions that I have.

2021年2月12日 · The 6502 is simply the second CPU of the 6500 family. 6501 was a 6500 CPU with an external interface (mostly) compatible with Motorola's 6800 CPU. 6503..07 were as well versions with modified external (bus) interfaces - usually less address. 6508 was a microcontroller with embedded RAM and an I/O port to compete against Motorola's new 6802.

2022年5月21日 · @Raffzahn Yes, bus cycle time is what we should be comparing. CPU clock frequency is just an implementation detail. The 6502 generates 2 non-overlapping phases from the clock input so a 1MHz 6502 is really 2MHz internally. If they had put a crystal oscillator on the chip then it might have been 4MHz (but still the same bus cycle time). –

2024年9月25日 · When reading about the history of the 6502 CPU, it is regularly pointed out that Chuck Peddle had previously worked on the MC6800 CPU at Motorola. As well, it is stated that the goal when creating the chip was to produce a cheaper alternative to the 6800, and that was achieved when you compare that the 6800 cost $300 versus the 6502's $20 ...

2005年12月28日 · The 6502 ISA was designed for hand-written assembly code, fast memory (relative to the CPU clock), what they could fit on a chip, and what microprocessor programmers were used to. Compared to today's software, which tends to be *strongly* object oriented and even component oriented, it is primitive.

2018年2月19日 · So while the raw CPU may have been available in late 1978, above examples show that it took roughly 3 years for computers to show up using this new CPU. Comparable to the Atari Series, only showing up 4 years after the 6502 CPU was available. It doesn't surprise me that it was not used in any business computers.

2024年7月16日 · * A 6502 SBC based around a 6502 CPU and a Pico. * I would like the Pico to emulate RAM/ROM and VIA/UART through USB serial terminal software like PuTTY. I can supply the logic chips if necessary (74xx series, etc.)