Serial Port Playstation

Pin	Signal	Name	Direction
1	RTS	PSX RTS	Out
2	GND	PSX GND	n/a
3	DTR	PSX DTR	Out
4	CTS	PSX CTS	In
5	TXD	PSX TXD	Out
6	DSR	PSX DSR	In
7	+3.3V	PSX VCC	n/a
8	RXD	PSX RXD	In

All the pins have 0V ... 3,3V logic, they need to be converted to -12V ... +12V for V24. This can easily be done this with the IC MAX-232 (ICL232).

Part list

2 MAX232 or ICL232 voltage converter
1 IC 7400 (4 NAND)
10 Capacitors 1uf (or higher) 16V
1 male Sub-D-connector 25 pin

IC1 - IC7400

IC2 - MAX-232

IC3 - MAX-232

All capacitors are 1uF or higher - 16V. Pay attention to the polarity of the capacitors, they are marked with a + next to each of them!!! The MAX-232 delivers -6V to +6V which is enough for driving the PC's serial port.

PC-side Serial pinout (25 pin Sub-D male)

Pin	Signal	Name	Direction
2	TXD	PC TXD	Out
3	RXD	PC RXD	In
4	RTS	PC RTS	Out
5	CTS	PC CTS	In
6	DSR	PC DSR	In
7	GND	PC GND	n/a
20	DTR	PC DTR	Out

This circuit acts like a REAL serial port like it is in your PC!!! You need a NULL-MODEM cable to connect this circuit to your PC. Do not use a standard serial cable!!! Use this circuit at your own risk and please don't blame us if anything won't work or produces only smoke or noise :) Please E-mail me for good ideas, programs, hackings for the PSX or N64...