On 10/08/2012 09:07 PM, firstname.lastname@example.org wrote: > > On 2012-10-08, at 20:25, Gerrit Heitsch wrote: > >>> http://dl.dropbox.com/u/58002657/cbm/c64/rom_adapter_0.png >> >> Looks OK to me... Please check in your circuit if the direct connection of pin 13 of the LS00 and pin 3 of the LS11 to +5V is there > > Yes, both are in place. > >> Could you upload a picture of the circuit as used? > > PCB: > ===== > http://dl.dropbox.com/u/58002657/cbm/c64/Scan-121008-0001.jpg > http://dl.dropbox.com/u/58002657/cbm/c64/Scan-121008-0002.jpg Well... the schematics show the unused gate of the 74LS11 as having all inputs grounded. But I see no traces on the PCB connected to pins 9, 10 and 11. Did you add that later with wire to pin 7 or has that gate all inputs floating open? If the latter, please fix this and try again. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-10-08 20:00:51
Archive generated by hypermail 2.2.0.