RS-232-C NAME DIR STD NOTES ---- --- --- -------------------------- FGND y Frame ground -- do not tie to signal ground TXD O y Transmit data RXD I y Receive data RTS O y Request to send CTS I y Clear to send DSR I y Data set ready GND y Signal ground -- do not tie to frame ground CD I y Carrier detect -5V n* 50 ma maximum *** WARNING -5V *** AUDO O n* Audio output from left (channels 0, 3) port, intended to send audio to the modem. AUDI I n* Audio input to right (channels 1, 2) port, intended to receive audio from the modem; this input is mixed with the analog output of the right (channels 1, 2). It is not digitized or used by the computer in any way. DTR O y Data terminal ready. RI I y Ring Indicator (A500/A2000 only) shared with printer "select" signal. RESB* O n* Amiga system reset. NOTES: n*: See warning above See part 1 of this appendix for pin numbers .