Ops Review

[Igor]

On Mon, 19 Jan 2009, chromatic wrote:

> I've skimmed all of the ops in our .ops files, and here are my
recommendations
> for deprecations.  This is a first pass, so I may have missed a few ops we
> don't need (especially variants), and I may recommend removing
something you
> use, so let's consider this a work in progress:


I'm not sure if bitwise operations refer to shifts, masks, Xors,(bit ops) etc.
If those are not related to this disscusion, please don't taking it into account.

There are used in controlling electronic devices, like stepped motors, 
used for aeromodelisms and in robotics where some bits are used for memory access 
and other signals(for programming eproms and eeproms), 
and each bit(each pin of a eeprom is given a 5 volts trouhg a byte and a mask(an OR)
 
fore example:

give 5 volts to pin 1, leaving other pins untouched:
           hex
xxxxxxxx   xx hex current pins on or off of device
11111110   FE the mask "ored" with
00000001   01  or FF on pin no 1  

give 0 volts to pin 1
           hex
xxxxxxxx   xx hex current pins on or off of device
11111110   FE the mask "xored" with
00000001   01  or FE on pin no 1  

for off a pin i think a xor is used.

Sincerely,

Igor



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