Early demo game needs some testing

@Druck

Thanks for trying the program,the output from the Vsync program as below:-

Using a PI2B+

Perhaps I’m barking up the wrong tree but I get fairly consistent results
but no error on the titanium, Oh well I was more curious than any this else?.

Getting average Vsync Time

average Time in uS is 16690 (59.9161174Hz)

Upper Limit (average+3%) 17190

Calculating Vsyncs Please Wait!

Average time between Vsync Errors 60Hz
Average Time In uS 17314.9375
Number Of Errors 16 Out Of 1000 Vsyncs Tested

@DavidS

Ok thanks for the reply.

I think its worth trying to finish the BASIC version, as nobody, (so far)
has come back and said its unplayable on modern type machines PI and above.

Thanks to all that tried the demo.

Late to the party, but here are my results using a Pi1:

Getting average Vsync Time

average Time in uS is 16650 (60.0600601Hz)
Upper Limit (average+3%) 17149

Calculating Vsyncs Please Wait!

...

Average time between Vsync Errors 54.0555556Hz
Average Time In uS 17485.6111
Number Of Errors 18 Out Of 1000 Vsyncs Tested

It varies a little bit though, roughly betwenn 16 and 18 errors.

I tried another PI2B+ in work today and also got errors
at around the monitor refresh rate?.

If you look at the output when the Vsync varies the incorrect Vsyncs
still mostly add up to the refresh rate eg. you might get a 12 followed
by 48 for a 60hz refresh.

The variation might be the BASIC program it was something I knocked up on the quick.

I meant to try the program on the Iyonix I have in work but I had real work to do so got distracted :-)

I have an Iyonix here at home I will set it up and try it.

Like I said before I get no errors on the Titanium?.

Perhaps its only certain PIs that have the Vsync error?.

Its just very strange that scanning a 1000 Vsyncs only shows errors @ approx the refresh rate?.

It locks on to the Vsync the way it works is very simple:-

FOR I%=0 TO 1000
IF I%=0:*FX19 :REM sync at start
SYS “Timer_Start”
*FX19
SYS “Timer_Stop”
NEXT

In the FOR loop is counts the number of Vsync between each incorrect reading and also records the time?.