Questions tagged [arm]

ARM is a British processor manufacturer that evolved from Acorn Computers in 1985.

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6
votes
4answers
189 views

Has there been any effort to research the undocumented Thumb instructions of ARM7TDMI?

Many CPUs have "holes" in the ISA, where the bit pattern is left undefined. Considering the Z80 and the 6502, many people have mapped out what these undocumented instructions actually do. ...
-5
votes
1answer
290 views

Is the Raspberry Pi Model B (2014) technically inferior to an original Xbox (2001) in compute power/specifically for emulators? [closed]

(I first asked this in the Raspberry Pi section, but it received no responses. I think this, Retrocomputing, might be a better fit.) I the year 2003, I had my Xbox chipped in order to be able to run ...
2
votes
2answers
322 views

How fast did the ARM-1 access memory?

The ARM-1, an early 32-bit RISC CPU, was used in the Acorn Archimedes computers, released in 1987. Its rated speed was one 32-bit instruction per cycle at 8 MHz. Typical RAM chips at that time would ...
15
votes
3answers
619 views

History of ARM Linux and FPA

ARM Linux, at least Debian was traditionally (pre eabi) built for the FPA floating point unit*. Unfortunately under old ABI it was not easily possible to mix soft-float code with FPA code. The result ...
6
votes
2answers
2k views

What sort of SBC is in the C64 Maxi?

Curious as to what model SBC this unit is using https://retrogames.biz/thec64 8 bit guys teardown says the internals are 'an ARM computer similar to a Raspberry Pi' https://youtu.be/kxx2F4ffmeE
8
votes
4answers
810 views

Why didn't the Acorn Archimedes support general purpose co-processors?

Acorn's BBC Micro series is well known for the range of add-on processors (or Second Processors) that could be connected through it's Tube interface. These included the 6502, Z80, 80186, and also the ...
18
votes
2answers
2k views

Did any early RISC OS precursor run on the BBC Micro?

Acorn famously developed the ARM microprocessor using their existing BBC Micros internally, both to simulate the ARM and to develop for actual ARM using a Tube-connected second processor. Later, ...
2
votes
2answers
591 views

Differences between normal ARM7TDMI and ARM7TDMI used in GBA [closed]

I was wondering if there are any significant differences between a plain old ARM7TDMI processor and the ARM7TDMI the GBA console uses. I'm interested in learning to program a GBA or an ARM7 type ...
8
votes
5answers
679 views

Why isn't the approach to lower power CPUs guided by design rather than accident?

We know that the ARM chip came out of the Acorn computing initiative. In the book The One Device, we read: The low-power big thing that the ARM is most valued for today, the reason that it's on ...
25
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2answers
3k views

Was the first ARM “processor” a BBC BASIC program?

The best background I have found so far on the early development of the ARM processor at Acorn comes from this interview with Steve Furber. The interview does not mention the development of the first ...