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 ...

2018年2月14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 ...

2024年6月18日 · The NES CPU was a copy of the 6502 with the BCD circuitry removed. As I understand it, this modification was motivated by a theory that BCD was the only part of the 6502 that was actually patented, so that by intellectual property law of the early 80s, it was technically legal to directly copy the rest of it.

The MOS 6502 (1 MHz) was introduced in 1975 for a price of $25. Then in 1978 MOS agreed to sell the 6502 (1.79 MHz) and an IO chip to Atari for $12 per set (because the production cost was $4). In 1977, the Zilog Z80A (4 MHz) was $65 for the ceramic package and $59 for …

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.

2020年10月17日 · Reading the Wikipedia article about real-time computing, I found written that:. Once when the MOS Technology 6502 (used in the Commodore 64 and Apple II), and later when the Motorola 68000 (used in the Macintosh, Atari ST, and Commodore Amiga) were popular, anybody could use their home computer as a real-time system.

2020年10月29日 · 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 ...

2021年12月7日 · With the 6502 he saw a chance to reduce the design effort by buying the CPU/IO/RAM/ROM standard parts and only create the additional Video/Sound logic, the part that ultimately became the TIA. Miner had a budget of 12 USD for what he wanted.