h6. [[PCI]] h6(. » [[PCI SWI Calls|SWI Calls]] h6((. » PCI_ReadHeader h2. PCI_ReadHeader h5. (SWI &50381) |_<^{width:4em}. Entry | | |<^. R1 |<^. Pointer to buffer | |<^. R2 |<^. Number of bytes to read (4-256, must be multiple of 4) | |<^. R3 |<^. [[Using PCI Devices|Function handle]] | |_<^{width:4em}. Exit | | |<^. R1 |<^. Buffer updated| |<^. R2 |<^. Preserved ?| |<^. R3 |<^. Preserved ?| h4. Use The purpose of this call is to read as much of the header as requested, rather than the limited information returned by [[PCI_ReadID]]. h4. See also * [[PCI_ReadID]]