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.
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1. Profi 5.06/1Mb(DRAM)+Profi5.06(UP)/HDD/3`5FDD/CF512Mb/SD-CARD
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Profi_ZX-BUS/ZXMC2/NemoIDE/SounDrive[свернуть]
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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.gifСообщение от solegstar
Pentagon 48 + MIKAY128 + VG93 Turbo + Stereo Covox + KJoy
Москва 128 + AY
Pentagon 1024SL 2.2 + ZXM-GS + Z-Controller + TSFM + Tape-In
ZX Evolution Rev. C + ZX-MultiSound
Compact 256 Turbo 1.1 (ZS Scorpion 256 INT, Port #FF, Port #FB) + Covox + ProfROM + NemoBus + NemoIDE + ZXM-GS
ZS Scorpion 256 Turbo+ + GMX + SMUC + GS Classic 2MB
Sprinter 2016S
К сожалению, я не говорю по-русски / Sorry, I don't speak Russian
https://github.com/zxshock
Good news, disabling the diodes and instead using OR-Gates (74ls32/555ЛЛ1) the kempston interface works reliable. #1f outputs all 0 and reacts to joystick inputs, while floppy access works nicely
Pentagon 48 + MIKAY128 + VG93 Turbo + Stereo Covox + KJoy
Москва 128 + AY
Pentagon 1024SL 2.2 + ZXM-GS + Z-Controller + TSFM + Tape-In
ZX Evolution Rev. C + ZX-MultiSound
Compact 256 Turbo 1.1 (ZS Scorpion 256 INT, Port #FF, Port #FB) + Covox + ProfROM + NemoBus + NemoIDE + ZXM-GS
ZS Scorpion 256 Turbo+ + GMX + SMUC + GS Classic 2MB
Sprinter 2016S
К сожалению, я не говорю по-русски / Sorry, I don't speak Russian
https://github.com/zxshock
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