signed nibble

Patrick Schluter Patrick.Schluter at
Tue Jan 8 10:55:59 UTC 2019

On Tuesday, 8 January 2019 at 10:32:25 UTC, Ola Fosheim Grøstad 
> On Tuesday, 8 January 2019 at 09:30:14 UTC, Patrick Schluter 
> wrote:
>> [...]
> Heh, I remember they had a friday-night trivia contest at the 
> mid-90s students pub (for natural sciences) where one of the 
> questions was the opcode for 6502 LDA (or was it NOP?), and I 
> believe I got it right. The opcode for NOP is burned into my 
> memory as $EA was used for erasing code during debugging in a 
> monitor. And it was also the letters for the big game company 
> Electronic Arts...
> The cycle counts for 6502 are pretty easy though as they tend 
> to be related to the addressing mode and most of them are in 
> the range 1-5... No instruction for multiplication or 
> division... Oh the fun...

2-7 cycles ;-)

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