Byte Description Value Meaning01 Special Options IdentificationThe value in this byte indicateswhat special options aresupported on the AHA-1740A/1742A/1744 hostadapter. Other host adaptersuse other values in this byte.41h (’0’ ASCII) Board is standard modelAll Others Reserved02 Firmware Revision Level (Firstbyte)This value indicates an ASCIIvalue from 0-9, that indicatesthe first digit of the firmwarebase code revision installed inthe AHA-1740A/1742A/1744.03 Firmware Revision Level(Second byte)This value indicates an ASCIIvalue from 0-9, that indicatesthe second digit of the firmwarebase code revision installed inthe AHA-1740A/1742A/1744.After completing this command, HACC will be asserted, indicating normalcompletion.Enable Mailbox Out Available Interrupt (Operation Code 05)The Enable Mailbox Out Available Interrupt command specifies that a Mailbox OutAvailable interrupt should be generated whenever a Mailbox Out entry has beencleared by the host adapter. One byte of outbound data is transmitted to indicatewhether the interrupt should be enabled or disabled.Byte 0 Enable/Disable Parameter: The Enable/Disable parameter byte mustbe either 00h or 01h. If the Enable/Disable parameter byte is 00h,the Mailbox Out Available interrupt is not returned. If the Enable/Disable parameter byte is 01h, the Mailbox Out Available interruptis returned as soon as a Mailbox Out has been cleared by the hostadapter.After completing this command, HACC will NOT be asserted to avoid generating ad-ditional interrupts. If the data byte is neither 00 nor 01, INVDCMD will be assertedindicating an invalid command. In this case, HACC will also be asserted.The Mailbox Out Available interrupt is normally intended to be used by the host asan indicator that a Mailbox Out entry is available. This function should only be en-abled if all Mailbox Out entries have been found full by the host. It should be dis-abled soon afterward. If used in other ways, the interrupt may generate a largenumber of relatively useless interrupt handling activities.adaptec AHA-1740A/1742A/17445-4
