Vax 613 0S Manuel d'instructions Page 216

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15.1 Main Configuration Table
System ROM code loads the MCT into the diagnostic area of main memory, where
it resides as long as power remains on. The system ROM main configuration code
is initialized with all the devices that are part of the system kernel and includes
six extra slots for potential TURBOchannel options. The DCTs associated
with non-TURBOchannel options and a generic TURBOchannel DCT entry are
resident as part of the system ROM code and are preinitialized once they are
loaded to RAM.
The MCT contains a list of the devices in the system and a pointer to the DCT
corresponding to each device. This table gives the TEST command dispatcher
a single interface into the various components of the system. The table has
a maximum length of 36 longwords: 4 contain the header information; the
remaining 32 consist of up to 16 2-longword entries identifying individual devices
and pointing to each device’s DCT address, as shown in Figure 21.
The address of the MCT is dependent on the version of firmware for that system.
To find the MCT location for your system configuration, contact the Digital
Customer Service support line listed in the preface.
Figure 21 Main Configuration Table
031
MR−0146−93RAGS
Major Version ID
Minor Version ID
Edit Version ID
Number of Devices
Device ID
DCT Address
Device ID
DCT Address
Device ID for TURBOchannel Devices
TURBOchannel DCT Address
Device Entry 1
Device Entry 2
Device Entry N
15–2 Configuration
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