The Question is:
We realize that there are certain limitations to running a VAX 7000 Model 800
processor with VAX-VMS 5.5-2(i.e., VMS will see the processor as a Model 600,
and all the limitations to a 600 apply), but will the board perform like a
Model 600 or will it sti
ll have the processing power/speed of an 800?
The Answer is :
Unlike OpenVMS Alpha, OpenVMS VAX is built with the name of each supported
system. VAX processors that can bootstrap on earlier versions of OpenVMS
VAX do so by emulating the appearance of an earlier VAX platform supported
by the target release -- if/when support is added for the particular VAX
platform, OpenVMS VAX generally then differentiates the system name based
on a console setting or based on a (deliberately) subtle difference in the
system-reported system identification information.
The limitations imposed by the system recognition capabilities of OpenVMS
VAX do not affect the processing speed of the CPU -- the processor speed
is fixed by the system hardware clock, and is not affected by the name
that OpenVMS assigns the platform.
In other words, your VAX 7000 model 800 will emulate a VAX 7000 model 600
(as designed) and will be reported as a VAX 7000 model 600 (as expected)
in this particular OpenVMS VAX environment, but this VAX 7000 model 800
system will perform as expected for a VAX 7000 model 800 series system.