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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 ...
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 ...
The BBC Microcomputer System, or BBC Micro, is a family of microcomputers developed and manufactured by Acorn Computers in the early 1980s as part of the BBC's Computer Literacy Project. Launched in December 1981, it was showcased across several educational BBC television programmes, such as The Computer Programme (1982), Making the Most of the ...
List of Intel Core processors. List of Intel Core 2 processors; List of Intel Core i3 processors; List of Intel Core i5 processors; List of Intel Core i7 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.
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]
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]