Re: Early-2014 Macbook Air and Linux Mint Cinnamon

On 2026-06-24, rbowman <[email protected]> wrote:

> On Wed, 24 Jun 2026 11:41:48 +0100, The Natural Philosopher wrote:
>
>> You can do operations on all registers too.
>> The accumulator is the register where the *results* of those operations
>> typically get stored.
>
> On the Z80 the AF register pair were often called the accumulator but F 
> was the flag register. 
>
> JR  NC, FOO  does the relative jump if the last operation on A cleared the 
> carry bit.
>
> * so says the internet. I remember it as 'JNC FOO' but there was always 
> the confusion since Zilog couldn't use Intel's super duper patented 
> mnemonics. 

Too bad.  I liked the Intel mnemonics better; they gave a clue as
to the operation of the instruction, which appealed to low-level
dweebs like me.  I'm sure the CS weenies liked Zilog's mnemonics
better, where every data movement instruction seemed to be some
form of LD.  I figured that if they were going to do that, they
might as well go whole hog and have constructs like LD PC,<addr>
for a jump, and LD A,@<portnum> for input (LD @<portnum>,A for
output, of course).  Then they could eliminate the now-redundant
instruction mnemonic entirely; programs would be just a long list
of operands, with the operation implied.

-- 
/~\  Charlie Gibbs                  |  No artificial
\ /  <[email protected]>      |  intelligence was
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