> On 2017-11-06, at 19:23, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > >> 1) smf wrote that there may be no way for the Amiga to accept the clock and output the sync. I haven't tested that but if true, then this alone might void the whole idea. > > Why not? I don't know - haven't checked that. Just mentioned what smf wrote. > I'm looking a the schematics for the A500+. There the Circuit to switch between the internal crystal and external clock is a 74F258. That means that the 8375 AGNUS doesn't know what clock it's running on and should happily produce sync even with external clock. Same for the A1000. > > The 8371 and 8372 seem to do this internally, but the question is, is it more than this simple circuit? How does it switch to accept the pulses then? Again - I haven't checked the schematics (don't even remember the pinout) so if you have one at hand and it's on the same pins, then there must be something telling it to run those pins as inputs. Might be done via internal DDR though. -- SD! - http://e4aws.silverdr.com/ Message was sent through the cbm-hackers mailing listReceived on 2017-11-06 20:00:02
Archive generated by hypermail 2.2.0.