Communications Register Unit

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Well-known base addresses

CRU addresses are usually configurable on the device board using DIP switches. Some addresses are well-known for specific devices.

Address System Device
0800 all Super Space cartridge
0900 all
0A00 all
0B00 all
0C00 all
0D00 all
0E00 all
0F00 all SGCPU mapper
1000 all IDE adapter, Myarc/Foundation memory expansion
1100 all Disk controller
1200 all
1300 all Serial/parallel interface (RS232/PIO)
1400 all EVPC (Enhanced Video Processor Card)
1500 all Second serial/parallel interface (RS232/PIO)
1600 all USB Smartmedia
1700 all
1800 all
1900 all Myarc/Foundation memory expansion
1A00 all
1B00 all HSGPL (High-Speed GPL card)
1C00 all
1D00 all
1E00 all SuperAMS memory expansion, SGCPU SAMS emulation
1F00 all P-Code card
2000 99/8
2100 99/8
2200 99/8
2300 99/8
2400 99/8
2500 99/8
2600 99/8
2700 99/8