SEGA joystick

Hello, boo_boo I bought a SEGA joystick over the weekend and connected it to the Delta-C48 (52 chips). Without joystick from port 31 reads 224. I connected the joystick via a homemade adapter DB-9F to ONC-7. The DB-9F (male) connector is suitable, although slightly different forms. It turned out that the joystick contains pull-up resistors of +5V and 255 is read. Therefore, Kempston interface circuits on chips without inversion (the polling signal is +5V and is pulled up by resistors to GND) in span or invert the signals of an additional IC, for example K555ЛH1 and connect GND. K interfaces with inversion (the polling signal is GND and is pulled up by +5V resistors) Easy to connect, you just need to connect GND. Without modifications you can use only 1 button from: Start, A, B or C. The Select signal is also with a +5V resistor and you don't have to connect. These options will not work for Sinclair joysticks. I don't began to invert, and soldered the wiring. Result: all buttons work and how Sinclair. Pinout in the ZX Multi Card theme http://www.zx.pk.ru/showthread.php?t=609&page=4&pp=10 P.S. I haven't tested the turbo joysticks. Supposedly they double the impulses from buttons They should work in normal mode.