On 10/5/2022 1:07 PM, groepaz_at_gmx.net wrote: > Am Mittwoch, 5. Oktober 2022, 19:55:16 CEST schriebgroepaz_at_gmx.net: >> Am Mittwoch, 5. Oktober 2022, 19:30:44 CEST schrieb Jim Brain: >>> Is the schematic available publicly anywhere? >> This is all i got >> >> http://filestore.to/?d=7JBI4YWN2S >> http://filestore.to/?d=XWTAU1HWJO >> >> Schematics and manual scan of the C64 one is missing > bleh, use > > https://turb.pw/cx6chdb8kn1h.html > https://turb.pw/q17t8v4h96i9.html > > instead, looks like filestore doesnt allow free downloads > > > -- > > http://hitmen.eu http://ar.pokefinder.org > http://vice-emu.sourceforge.net http://magicdisk.untergrund.net > > A fanatic is a man who does what he thinks the Lord would do if He knew the > facts of the case. > <Finley Peter Dunne> > > > > According to the schematics in the download: * The switch sets a 7474 flip flop (which means the bouncing of the switch would not affect anything) * The output is then fed into a second flop * The second flop is clocked by the joystick port * once clocked, the NMI line is pulled low *AND* the $de on the data bus is armed to be injected when A15-A0 = 1111111111111X1X * The entire thing can be turned off with a poke to $de00-de7f of x1xxxxxx So, it looks to me that the joyport connection is required for the NMI to be asserted. Jim -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2022-10-05 23:00:03
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