Power Basic has a very powerful function called MTIME
where it can measure the time it takes to do something
in the 2 micro second resolution range.

Back when I got my first copy of PB in about 1998 or so
it took 210 microseconds to calculate the value of pi
on the PC computers that were common in those days.

pi# = ATN(1) * 4

Now this is done in less than a microsecond on this PC board
I am going to use for the EFI controller.
In fact it can do this 100 times in about 51 micro seconds.
In other word words it only takes about 1/2 microsecond.

Lets say we wanted to know the exact RPM of the rotary
running around 7500 RPM or 7 ms or 7,000 micro seconds per rev.
We start the timer at rotor 1 TDC and stop it when
TDC rotor 1 happens again. Our resolution on the exact RPM
is one part in 3500 or plus or minus 2 RPM!!!!!!!!!!!!!!!!!!!!!!!

This has far reaching implications for PC boards used
as real time hardware controllers.

BTW here is a picture of the computer in a $20 BTC key board
we will use as a hard ware interrupter controller.

Paul Lamar.