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GENERAL INFORMATION
Interrupt Structure paragraph in Chapter 4) or SCSI bus activity is slowed down. Additional commands may be sent to the SCSI firmware for a different peripheral device.
$FFFE078E: FUNNEL COMMAND ENTRY
This entry point is used by applications that require multiple interfaces to the SCSI firmware. Unlike the single user command entry, you may issue commands anytime the firmware does not require an RTE to be performed. If an RTE is required, and you wish to send a command at the same time, you may accomplish both by using the RTE entry (described below). The use of the FUNNEL command entry causes the FUNNEL module to examine the state of the SCSI bus, determine if the bus is currently in use, and send the command to the bus if it is not in use. If the bus is currently in use, the FUNNEL module checks if the device is not busy so it can preprocess or queue the command and return to the caller with an intermediate status of $A002. This preprocessed or queued command is processed and sent to the SCSI bus when the bus is free.
$FFFE0794:
Branches to FUNNEL entry. All the queued commands are serviced in the interrupt service routine through software interrupt.
$FFFE079A: RTE ENTRY
The SCSI firmware notifies the user/caller that an RTE instruction needs to be executed by the RTE bit (13) of the returned status word. If this bit is 0, an RTE is required; if this bit is 1, an RTE is not required (the SCSI firmware does not execute the RTE instruction so as not to preempt a task in a VERSAdos or SYSTEM V/68 environment). SCSI firmware users may inherit an RTE from another caller because of the multiple caller interface. When an RTE is inherited from another caller, the use of the RTE entry may be required to send down a new command before executing an RTE instruction.
Equipment Supported
The following list shows the controller type assignments for SCSI controllers explicitly supported by the SCSI firmware, and the drives supported by each. /f3Note, however, that Motorola does not necessarily endorse or recommend
