Base Class S2 | Description | ||
| S3 - S4 |
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1 | A0 |
| SCSI Drivers (generic) |
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| B0 |
| IDE Drives |
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| C0 |
| RAID Drives |
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| D0 |
| SSA Drives |
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| E0 |
| Tapes SCSI |
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| E1 | Tapes IDE | |
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| ED |
| SCSI changer |
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| EE |
| Other SCSI device |
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| EF |
| Diskette drive |
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| F0 |
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| F1 |
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| F2 | Read/Write optical SCSI | |
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| F3 |
| Read/Write optical IDE |
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| F4 | - FF | TBD media devices |
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5 | A0 |
| L2 Cache Controller including integrated SRAM |
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| A1 | L2 Cache SRAM | |
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| A8 |
| NVRAM |
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| A9 | CMOS | |
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| AA |
| Quartz/EEPROM |
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| B0 | - Bx | Memory cards |
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| Cyy | Memory Modules (Where C is S2, S3, or S4 and yy | |
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| identifies the memory size and type). |
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7 | A0 |
| I2C bus |
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8 | A0 |
| Power Management Functions |
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9 | A0 | - Ax | Keyboards |
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| B0 | - Bx | Mouse(s) |
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| C0 | - Cx | Dials |
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| D0 |
| Tablet |
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| D1 - Dx | Future input devices | |
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B | A0 |
| Service processor |
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Appendix A. Interpreting Firmware Error Codes |
