Incremental control of servo motor

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hello all!

i'm looking way control servo motor incrementaly. mean, if want move servo, specify change of angle, instead absolute position.

in particular case:
when loop starts frst time servo position needs be, lets 90 degrees. required change +30 degrees, : 90+30= 110, , position 110 degrees must send servo , stored. when loop repeats takes 110 degrees current angle, , if next required change 50 degrees, calc 110+50=160 , write pos= 160 deg.

i may try eeprom, far know, type of memory more temporary data...
so, appreceate every opinion!

best regards

quote
so : 90+30= 110

what number base working in there?

why eeprom?
what's wrong ram, or system have hold position across reset?


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