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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).
The BBC Microcomputer System, or BBC Micro, is a series of microcomputers designed and built by Acorn Computers Limited in the 1980s for the Computer Literacy Project of the BBC. The machine was the focus of a number of educational BBC TV programmes on computer literacy, starting with The Computer Programme in 1982, followed by Making the Most ...
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 ...
Torch Computers Ltd was a computer hardware company with origins in a 1982 joint venture between Acorn Computers and Climar Group [1] that led to the development of the Communicator or C-series computer, a system based on the BBC Micro with a Z80 second processor and integral modem, intended as a viewdata terminal. [2]
Acorn Computers Ltd. was a British computer company established in Cambridge, England in 1978 by Hermann Hauser, Chris Curry and Andy Hopper. [1] The company produced a number of computers during the 1980s with associated software that were highly popular in the domestic market, and they have been historically influential in the development of computer technology like processors.
Due to a quirk of the 6502's design, the CPU left the memory untouched for half of the time. Thus by running the CPU at 1 MHz, the video system could read data during those down times, taking up the total 2 MHz bandwidth of the RAM. In the BBC Micro, the use of 4 MHz RAM allowed the same technique to be used, but running at twice the speed.
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] 6502C
Helix Systems (in Missouri, United States) designed an extension to the SWTPC SS-50 bus, the SS-64, and produced systems built around the 68008 processor. 68000 [41] and 68008 [42] second processors were released for the BBC Micro in 1984 and 1985 respectively, and according to Steve Furber contributed to Acorn developing the ARM. [43]
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