Labels:text | diagram | font | screenshot | line | plan | number | schematic OCR: 12C-bus interface on the serial port +5V 9 +5V MC1488 +12V 4K7 14 DCD+ →→SDA 8 -12V 4K7 BC548 DTR → SCL 20 BC548 RTS 4 10K GND GND 7 Red arrows indicate signal direction Blue numbers indicate pin numbers on A500/A2000 serial port Pinout as suggested by "C"T" magazine (issue 7/92) 10K