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20 June 2024, 22:50
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#141 | |
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Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,478
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20 June 2024, 23:53
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#142 |
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Registered User
Join Date: Mar 2018
Location: Hastings, New Zealand
Posts: 2,742
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I think Acorn messed up calling the ARM2 and ARM3 '26bit' processors. By all standard definitions they are 32 bit - 32 bit data bus, 32 bit registers, 32 bit ALU, 32 bit instructions. Only the program counter and address bus are 26 bit. No other CPU had its 'bitness' determined by the size of its address bus.
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21 June 2024, 01:17
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#143 |
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Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,478
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I dunno, they all do now. We reserve 64-bit to describe machines capable of dealing with flat memory models beyond 32-bit and there were "32-bit" processors that could happily perform operations on 64-bit values.
The problem arises because we try to sum up a CPU in a single number, but arithmetic operand size and total addressable memory space aren't the same thing. |
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21 June 2024, 05:45
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#144 | |
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HOL/FTP busy bee
Join Date: Sep 2006
Location: Germany
Age: 46
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