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.
Systems: 99/4, 99/4A, 99/8, Geneve
| Address | System | Device |
|---|---|---|
| 0800 | 99/* | Super Space cartridge |
| 0F00 | 99/* | SGCPU mapper |
| 1000 | all | IDE adapter, Myarc/Foundation memory expansion |
| 1100 | all | Various disk controllers |
| 1200 | all | Modem (TI) |
| 1300 | all | Primary serial/parallel interface (RS232/PIO) |
| 1400 | 99/* | EVPC (Enhanced Video Processor Card) |
| 1500 | all | Secondary serial/parallel interface (RS232/PIO) |
| 1600 | all | USB Smartmedia |
| 1700 | all | Hexbus interface |
| 1800 | 99/* | Thermal printer |
| 1900 | all | EPROM programmer (TI), Myarc/Foundation memory expansion |
| 1B00 | all | GPL "Future extension", HSGPL (High-Speed GPL card) |
| 1C00 | 99/* | Video controller card (TI) |
| 1D00 | 99/* | IEEE 488 controller card (TI) |
| 1E00 | all | SuperAMS memory expansion, SGCPU SAMS emulation |
| 1F00 | all | P-Code card |
| 2700 | 99/8 | Internal DSR |