The selection, with which device data will be exchanged, will be done with the device number. And any device, which is connected to the serial bus draws 5mA. The reason for this is, that the (inverting driver 7406) in the C64 can handle a maximum load current of 40 mA. Practically the upper limit is at around 8 devices. However, the operating system of the C64 can use only the device numbers 4 to 30, because 0-3 are already used internally. Theoretically there are up to 31 devices possible ( 0 to 31, 31 is reserved for UNTALK/UNLISTEN). More than only one device can be connected, therefore most of the peripheral devices have loop-through connectors. Since serial ports are usually used only for the connection of two devices (e.g. To test the serial parser I want to setup a virtual serial port so the test can communicate with the parser. The application is written in Java and uses the purejavacomm library. I am writing a JUnit test to test my application. Ask Question up vote 4 down vote favorite. Ifndef _SERIALPORT_H_ #define _SERIALPORT_H_ #. This interface variant is not compatible with, which is the standard for the serial interface for IBM-compatible PCs. Technically, it is a commodore-specific variant of the parallel -Bus, therefore it is often called IEC bus or CBM bus. Serial interface of a C64 The serial bus ( IEC or CBM bus) is the standard interface for connecting external devices as.
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