Atari 1040STE, Field Service Manual

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3.21.5 MIDI
M0 Data not received.
M1 Data received is not what was sent. M2 Data input framing error.
M3 Parity error.
M4 Data overrun. Byte was not read from the 6850 before next byte arrived.
3.21.6 Printer and Joystick/Game Ports
P0 Printer port error.
P1 Busy (printer port input) failed.
J0 Joystick port 0 failed.
J1 Joystick port 1 failed.
J2 Joystick (keyboard controller) timed–out.
J3 Left button line failed.
J4 Right button line failed.
J5 Auxiliary joystick direction (game controller port).
J6 Auxiliary fire button (game controller port).
J7 Paddle (game controller port).
J8 Light gun (game controller port).
3.21.7 RS232
S0 Data not received.
S1 Data received is nat what was sent.
S2 Data input framing error.
S3 Parity error.
S4 Data overrun. Byte was not read from the MFP before the next byte arrived.
S5 IRQ. The MFP is not generating interrupts for transmit or receive.
S6 Transmitter error – MFP
S7 No interrupt from transmit error (MFP).
S8 No interrupt from receiver error (MFP).
S9 DTR–RI. These signals are connected by the loopback connector. Changing
DTR does not cause change in RI.
SA DTR–DCD. Same as S9 for these signals.
SB RTS–CTS. Same as S9 for these signals.