IDPROM

The IDPROM address space provides system information including Machine Type, Serial Number, Ethernet Address, and Manufacturing Date. This information may be stored in an IDPROM, NVRAM, or EEPROM. The 32 Bytes of IDPROM content are shown below.

The Machine Type and Serial Number are combined to create the Hostid. Licensed software may use the Hostid.

Prior to the SPARCstation 10, the Machine Type was used by the operating system to identify the architecture and the architecture implementation.

Beginning with the SPARCstation 10, systems are not assigned a unique Machine Type. The device tree in the Open Boot PROM provides the system characteristics to the operating system. The high-order bit of the Machine Type is set to 1. The lower 7 bits of the Machine Type and Serial Number fields are used at Sun's discretion.

The alpha-numeric code on the NVRAM barcode label can be used by Sun to create a duplicate NVRAM. Provide this information when ordering a replacement NVRAM.

IDPROMs, NVRAMs, and EEPROMs are not interchangeable.

Programmed components that have a unique machine type are not interchangeable. The 48T02, 48T08, 48T18, and 48T59 are not interchangeable. The 48T08 and 48T18 are not pin compatible with the 48T59.

The NVRAM also contains a Time of Day clock. Accuracy of the clock is typically +/- 1 minute per month at 25°C. The 32,768Hz oscillator is tested not to exceed +/- 1.53 minutes per month (35PPM) error rate at 25°C.