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timestamps as used on mainframes/unix etc are imho the simplest,easiest and most efficient way to measure time periods accurately. they work marvelously on pic micros too, i have tried to...

i did a little test , your way is 4 times bigger code and executes upto 10 times slower



#CONFIG __config _CONFIG1, _FEXTOSC_OFF & _RSTOSC_HFINT32 & _CLKOUTEN_OFF & _CSWEN_OFF & _FCMEN_ON
...

it could simplify further



IF (UsartFlag = 1) then
ARRAYREAD RecvData,5,itsadud,[wait(UsartRight,UsartSlave,Usart0)]
select case RecvData[3]
case UsartC
IF RecvData[4] ==...

try array read



IF (UsartFlag = 1) then
ARRAYREAD RecvData,5,ndisp,[wait(UsartRight,UsartSlave,Usart0,UsartC,Usart2)]
GOSUB DisplayCOM1
ndisp:
...