Сборка Пентагон 128к

[Shockwav3]

Could you help me with the Kempston interface on the daughterboard?
I can't make out for sure where the pins for the directions and fire are.

[null_device]

Part of the circuit which implements the interface joystick. There are two options. Fire - or 8 output chips, or 11.
Not rule out that wiring is faulty (or just very specific divorced).

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[solegstar]

Shockwav3, my advice, just load the game and run with selected kempston-joystick option, then try to connect unknown pins IDC10 to GND and see what happen on screen.

[Shockwav3]

Yes, I've already checked the board against the scheme. While the Pins for left (13) and right (11) are obvious, the other pins connect to legs 4, 6 and 8 on the chip

[solegstar]

it isn't important as inputs are connected, the main thing that was compliance an input output of AP3 and were connected to appropriate bits of the data bus. 1533AP3 (SN74ALS240) is 8-bit data bus tranciever with inverted outputs.

[Evgeny Muchkin]

Небельмеса

[Mdesk]

I have checked wires on the PCB:

[Shockwav3]

I've soldered a D-Sub 9 port as described, but for some reason it does not work.
When using "10 PRINT IN 31;:GO TO 10" in basic for testing I get a constant value of 255. It doesn't matter if I have a joystick connected or not.

[Mdesk]

Symbols of diodes VD3 - VD5 are misdirected on the picture of this PCB for 1N4148 diodes. Cathodes of all diodes must be connected to pins 1, 19 of DD7:

[Shockwav3]

Symbols of diodes VD3 - VD5 are misdirected on the picture of this PCB for 1N4148 diodes. Cathodes of all diodes must be connected to pins 1, 19 of DD7:

I think I read that somewhere before, which is why they're connected opposite of the pcb prints on my board. 1n4148

EDIT3: We're getting there, adjusting the R11 with the faulty value of 1k-Ohm to 1m-Ohm allows me to access TRDOS and _randomly_ the Joystick (Test program returns values like 00000255255255, etc.)
EDIT4: It's working Bypassing the diodes and sending /OIRQ, /RD and A5 through OR-Gates as shown here (http://8bit.yarek.pl/hardware/zx.joystick/kjschem.gif) the kempston Joystick works along with TRDOS access.
Maybe that's something that could be fixed on the next Revision of the board?