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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).
ARM Evaluation System second processor for BBC Micro: ARM2 ARM2 Acorn Archimedes, ChessMachine: ARM250 ARM250 Acorn Archimedes ARM3 ARM3 Acorn Archimedes ARM60 ARM60 3DO Interactive Multiplayer, Zarlink GPS receiver ARM610 ARM610 Acorn Risc PC 600, Apple Newton 100 series: ARM700: ARM700 Acorn Risc PC prototype CPU card ARM710: ARM710 Acorn ...
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]
The BBC had a difficult decision to choose which year group would be the first to receive the free micro:bits, and the BBC's head of learning said that the reason they "plumped for Year 7, rather than Year 5, is it had more impact with that age group as they were more interested in using it outside the classroom".
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.
The BBC Micro shipped with a single ROM, containing BBC BASIC; further ROMs can be added to the computer to add software that will remain available at all times. The Electron's sideways address space was exposed only by the addition of a Plus 1 add-on or a third-party equivalent; the Plus 1 also introduced cartridge slots that were carried over ...