Articles, notes and random thoughts on Software Development and Technology
The Mac has a neat eyedropper app provided, called Digital Color Meter.
Start it up (it’s in Applications/Utilities, or use Spotlight to find it), move your mouse over any other app or webpage and the app will display the RGB values for the color under the pointer. Easy!
More info here.
Wow. Not that I need something else to learn right now, but this is a pretty detailed tutorial covering 6502/6507 assembly for the Atari 2600:
http://www.randomterrain.com/atari-2600-memories-tutorial-andrew-davie-01.html
Apache has announced End of Life for Log4J 1.x in August 2015, ending support. Users are encouraged to upgrade to 2.x releases.
In my dabbling with ARM assembly so far (my most recent achievement was completing my simple sorting algorithm – last update here), I had picked up that there’s 16 general purpose 32bit registers for holding either values or addresses, R0 through to R15, but paying a closer look I realized some of these have specific purposes, and or uses by convention.
R0: function argument or result
R1-R3: function args
R4-12: general purpose
R13: SP – this is the stack pointer
R14: LR – Link Register – it’s holds the address to branch back to when you call BR LR
R15: PC – the Program Counter – address pointing to the current instruction being processed
More info in the great summary on ARM Assembly here, and also in the ARM11 tech ref here.