Pentagon 128k debugging

[Shockwav3]

try to replace silicon diodes on germanium diodes or Schottky diodes with small voltage drop on P-N transition. The R11 resistor shall be 10 kOhms. On scheme (http://sblive.narod.ru/ZX-Spectrum/P...28VMGPage3.jpg) used /OIRQ signal and germanium diodes Д9.

I'll try that with adjusting R11 to 10kOhms, in case that alone won't help, I'm going to drive /RD, /OIRQ and A5 through OR-gates as shown here: http://8bit.yarek.pl/hardware/zx.joystick/kjschem.gif