RQDX3 on an 11/23?

[Jerome H. Fine]

 >Eric Smith wrote:

>>Peter wrote:  
>
>>RT-11 V.5.x will recognise an RQDX controller and
>>drive, but it needs to be V05.03 or higher for an RQDX3 (earlier
>>version of V5 have a bug that causes it to fail to initialise RQDX3
>>controllers properly -- though I wrote a patch if you need it).
>>
>Does the bug affect any other MSCP controllers?  I'd be interested in
>looking at the patch to see what the RQDX3 does differently than other
>MSCP controllers.
>
Jerome Fine replies:

HOWEVER, prior to V05.03 of RT-11, DU(X).SYS
is unable to handle RT-11 partitions.  Thus you
are limited to 32 MBytes hard drives.  Starting
with V05.03 of RT-11, a hard drive can be up to
8 GBytes, although until V05.05 of RT-11, only
256 MBytes or 8 RT-11 partitions may be active
at one time on all drives on the device driver.
Starting with V05.05, 64 RT-11 partitions may be
active on the device driver.

NOTE that although a device driver can handle up
to 4 controllers (different CSR / VECTOR pair),
it is allowable to use a different device driver
for each controller.  Thus, if you have all of MFM,
ESDI and SCSI controllers (or especially a few of
each), you can have as many MSCP device drivers
as controllers.  I have run real DEC systems with
as many as 8 MSCP device drivers (just to see if
could be be done - far too many to keep track of
under normal conditions).  Naturally, each device
driver MUST have a separate name PLUS if any are
SYSGENed for more than 8 RT-11 partitions, each
such device driver that can handle more than 8 RT-11
partitions much start with a different first letter.
Do not choose "L" since that is reserved for the
LD(X).SYS device driver.

Any other questions?

Sincerely yours,

Jerome Fine
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