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Interior of the 6502 Second Processor. The 6502 Second Processor (using a 6502C) was clocked at 3 MHz, a full 50% faster than the 6502 inside a BBC Model B, and also had 64 KB of RAM, of which typically 30–44 KB was free for application data (compared to as little as 8.5 KB on an unexpanded Model B in graphics mode, or only 5.75 KB with the disc interface).
One popular 6502-based computer, the Commodore 64, used a modified 6502 CPU, the 6510. Unlike the 6503–6505 and 6507, the 6510 is a 40-pin chip that adds internal hardware: a 6-bit parallel I/O port mapped to addresses 0000 and 0001.
And a million and a half BBC Micros later, it was still working, and I still didn't know why". Another mystery was the 6502's data bus. The prototype BBC Micro exceeded the CPU's specifications, causing it to fail. The designers found that putting a finger on a certain place on the motherboard caused the prototype to work.
Numerous coprocessors were developed for the Tube. Most commonly seen was the 6502 Second Processor, featuring a MOS Technology 6502 processor, which allowed unmodified BBC Micro programs to run faster and with more memory, as long as they use the API for all I/O. [1] [2] The Z80 Second Processor featured a Zilog Z80 processor running CP/M, and the 32016 Second Processor featured a National ...
Rather than the MOS Technology 6502 microprocessor used by the Model B, Master series models used the slightly improved 65C12. [4] Fabricated using CMOS technology, the 65C12 used less power than the 6502 and offered somewhat better performance, reportedly "almost as fast" as the original 3 MHz 6502 second processor for the BBC Micro. [5]
Processor Year Video type Mass storage Video chip (see list) Compatibility Remarks Ref UK Acorn Computers: Acorn Atom: 6502: 1980: TV: Cassette: 6847 [1] UK Acorn Computers: BBC Micro: 6502: 1981: TV, RGB, composite video: Cassette, diskette option: 6845, SAA5050 Teletext: Optional processor boards; Several models, see article [citation needed ...
Home computers using the 6502 CPU family. ... Pages in category "6502-based home computers" ... BBC Master; BBC Micro; C. C-One; Commodore 64; Commodore 128;
Acorn System 3 computer equipped with (from left) a 6502 CPU card, a 40-column VDU card, three memory cards, an Econet card, and a floppy disc drive. The Acorn System [ 1 ] was a series of modular microcomputer systems based on rack-mounted Eurocards developed by Acorn Computers from 1979 to 1982, aimed primarily at industrial and laboratory ...