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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]
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 ...
KIM-1 computer in operation The KIM-1 , short for Keyboard Input Monitor , is a small 6502 -based single-board computer developed and produced by MOS Technology, Inc. and launched in 1976. It was very successful in that period, due to its low price (thanks to the inexpensive 6502 microprocessor) and easy-access expandability.
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.
WDC added new addressing modes to the BIT instruction that was present in the 6502, as well two new instructions for convenient manipulation of bit fields, a common activity in device drivers. BIT in the 65C02 adds immediate mode, zero page indexed by X and absolute indexed by X addressing. [ 15 ]
Their moves legitimized the 6502, and by the show's end, the wooden barrel full of samples was empty. [citation needed] The 6502 would quickly go on to be one of the most popular chips of its day. A number of companies licensed the 650x line from MOS, including Rockwell International, GTE, Synertek, and Western Design Center (WDC).
Charles Ingerham Peddle [2] (November 25, 1937 – December 15, 2019) [3] was an American electrical engineer best known as the main designer of the MOS Technology 6502 microprocessor, the KIM-1 single-board computer, and its successor, the Commodore PET personal computer, both based on the 6502.
cc65 is a cross development package for 6502 and 65C02 targets, including a macro assembler, a C cross compiler, linker, librarian and several other tools. Overview [ edit ]