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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