NEXCOM VMC 3000/ 3001 - Manual (Page 147)

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Appendix A: I/O Address Function
IO ADDRESS: 0ED0H~0EDFH
I/O port: 0ED0H addresses uses delivery internal data
1. MCU version byte (8 bits)
I/O port : 0EDEH
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1 Bit 0
Description 8 bits data (Bit 7 is highest bit of data)
2. GAL version byte (8 bits)
I/O port : 0EDFH
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit1 Bit 0
Description 8 bits data (Bit 7 is highest bit of data)