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U6: I/O Port IN/OUT Function (Signal name) Description
P15 IN TX KEY Remote terminal TX signal, TX: L
P16 IN BUSY (TUNE OK) Busy signal from ant. coupler
P12 IN PTT PTT signal, ON: L
P73 IN RX MUTE MUTE signal from CONTROL terminal
P74 IN UNLOCK PLL unlock, unlock: L
P75 IN SQ SIG Squelch ON/OFF signal
P90 OUT DDS DATA DDS shift register serial data
P91 OUT DDS CLK DDS shift register clock
P95 OUT TXD Data to remote terminal
P96 IN RXD Data from remote terminal
P10 IN UP Freq./channel up signal
P11 IN DOWN Freq./channel down signal
P50 OUT D0 LCD data, key scan
P51 OUT D1 LCD data, key scan
P52 OUT D2 LCD data, key scan
P53 OUT D3 LCD data, key scan
P54 OUT D4 LCD data
P55 OUT D5 LCD data
P56 OUT D6 LCD data
P57 OUT D7 LCD data
P60 IN READY LCD control
P61 OUT CS LCD control
P62 OUT WE LCD control
P63 OUT SYNC LCD control
P20 IN S1 to S4 Scan input
P21 IN S5 to S8 Scan input
P22 IN S9 to S12 Scan input
P23 IN S13 to S16 Scan input
P70 OUT DIM LCD, KEY illumination
P71 OUT DIM LCD, KEY illumination
P72 OUT DIM LCD, KEY illumination
P14 IN/OUT S-DATA Serial data input/output
P13 OUT S-CLK EE-ROM clock
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