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  2. Ricoh 2A03 - Wikipedia

    en.wikipedia.org/wiki/Ricoh_2A03

    The Ricoh 2A03 [1] contains an unlicensed derivative of the MOS Technology 6502 core, modified to disable the 6502's binary-coded decimal mode (possibly to avoid a MOS Technology patent [2]). It also integrates a programmable sound generator (also known as APU, featuring twenty two memory-mapped I/O registers), [ 3 ] rudimentary DMA , and game ...

  3. Interrupts in 65xx processors - Wikipedia

    en.wikipedia.org/wiki/Interrupts_in_65xx_processors

    The 65xx family of microprocessors, consisting of the MOS Technology 6502 and its derivatives, the WDC 65C02, WDC 65C802 and WDC 65C816, and CSG 65CE02, all handle interrupts in a similar fashion. There are three hardware interrupt signals common to all 65xx processors and one software interrupt , the BRK instruction.

  4. Merlin (assembler) - Wikipedia

    en.wikipedia.org/wiki/Merlin_(assembler)

    Merlin is a MOS Technology 6502 macro assembler developed by mathematics professor Glen Bredon for the Apple II under DOS 3.3. It was published commercially by Southwestern Data Systems, [1] later known as Roger Wagner Publishing. Merlin continued to be updated as successors to the 6502 became available: first the 65C02 and later the 65816 and ...

  5. MOS Technology 6502 - Wikipedia

    en.wikipedia.org/wiki/MOS_Technology_6502

    6502 A 1 MHz chip used in KIM-1 and other single board computers in the mid-1970s. 6502A A 1.5 MHz chip used in Asteroids Deluxe and at 2 MHz in the BBC Micro: 6502B Version of the 6502 capable of running at a maximum speed of 3 MHz instead of 2 MHz. The B was used in both the Apple III and early Atari 8-bit computers, each running at ~1.8 MHz. [c]

  6. BBC Micro expansion unit - Wikipedia

    en.wikipedia.org/wiki/BBC_Micro_expansion_unit

    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).

  7. GeckOS - Wikipedia

    en.wikipedia.org/wiki/GeckOS

    GeckOS is a multitasking operating system for MOS 6502, and compatible processors such as the MOS 6510. [1] The GeckOS operating system is one of the few successful attempts to implement a Unix-like operating system on the 6502 architecture.

  8. Commodore PET - Wikipedia

    en.wikipedia.org/wiki/Commodore_PET

    The BASIC included on the original PET 2001 was known as Commodore BASIC 1.0; Microsoft supplied Commodore with a source listing for their 6502 BASIC, essentially a port of BASIC-80, and Commodore performed the rest of the work themselves, including changing the startup screen and prompts, adding I/O support, the SYS command for invoking ...

  9. Acorn System 1 - Wikipedia

    en.wikipedia.org/wiki/Acorn_System_1

    Bottom row: 1 MHz clock crystal, 4 × TTL logic chips providing address decoding for the memory and I/O expansion, 5V regulator. The smaller empty socket in the middle of the board was used to set the memory map of the RAM, ROM and I/O expansion by fitting or soldering wires between various positions according to the instructions in the Acorn ...