On Wednesday 21 June 2017, 20:12:41 silverdr@wfmh.org.pl wrote: > > On 2017-06-21, at 19:44, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > >> ... that I never used LP IRQs but thought that it would trigger only when > >> the button line is grounded within a specific timing window so some kind > >> of synchronisation with raster position would be required for the IRQ to > >> happen. But that's a different subject anyway.> > > No, the LP IRQ just latches the current X and Y position of the electron > > beam when you get the high to low transition on the LP line. And you also > > get an IRQ to notify you of that event. > > > > On 2017-06-21, at 19:46, smf <smf@null.net> wrote: > > > > The VIC just latches the x & y position & fires an IRQ when it is > > triggered, because it assumes that if the light pen can see the gun then > > it must be over the current pixel. > > > > Adding something to VIC to ignore pulses outside the visible portion of > > the display would be a waste of space. > But that means that I can basically trigger valid LP IRQs using joystick and > pushing its fire button.. ...and by pressing SPACE, correct :) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ar.pokefinder.org The thing is, I HAVE learned Excel, C and MATLAB and nothing in there compares with the simplicity, easy of use and time saved of using good old Basic V2. <Eslapion> Message was sent through the cbm-hackers mailing listReceived on 2017-06-21 19:02:32
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