Any have a CMD CQD-200/M manual?
Jerome H. Fine
jhfinedp3k at compsys.to
Tue Feb 17 19:17:59 CST 2009
>Zane H. Healy wrote:
> >On Fri, 13 Feb 2009, Tobias Russell wrote:
>> Am I right in thinking I get use the SET command to build a map table so
>> I can use the rest of the space?
>> If so anyone know the commands I need to issue?
> You don't mention what version of RT-11 you're running, just how many
> partitioins you can have will depend on the version. My guess is you're
> limited to 8, as you need to be at 5.5 or higher to have more.
> I think this is right, my notes and systems are temporarily all in
> SET DU0: PORT=0, UNIT=0, PART=0
> SET DU1: PORT=0, UNIT=0, PART=1
> SET DU2: PORT=0, UNIT=0, PART=2
> SET DU3: PORT=0, UNIT=0, PART=3
The above SET commands require at least V05.03 of RT-11. Prior to V05.03
of RT-11, you can use only PART=0 since the SET commands are not
supported. I assume that you are using at least V05.00 since you would
not be able to even see DU0: otherwise.
The above set commands assume that the the SCSI ID is zero, i.e. the
drive is connected as unit 0. If you set the SCSI ID to a different
value or you
add other physical drives at other SCSI IDs, then adjust the UNIT=0 portion.
RT-11 allows the SCSI ID to be a maximum of 255, although with the CQD
200/M, I expect that the maximum value you will be ever using is UNIT=6
with the host adapter using SCSI ID=7.
The other additional commands are:
SET DU4: PORT=0, UNIT=0, PART=4
SET DU5: PORT=0, UNIT=0, PART=5
SET DU6: PORT=0, UNIT=0, PART=6
SET DU7: PORT=0, UNIT=0, PART=7
As long as any given RT-11 partition is a data device, the actual partition
can be a value from 0 to 255. This means that an 8 GigaByte hard drive
with 256 RT-11 partitions can be easily accessed, although the only
person who has (bragged) of that size of SCSI drive has been Tim Shoppa.
Under RT-11, each DUn: is regarded as a different physical device even
though they are all on the same physical disk drive. Since the block number
is 16 bits in RT-11, the maximum block number is 65535 (although in most
cases, the maximum block number that is actually used is 65534). Thus,
the maximum size of an RT-11 device is 32 MegaBytes.
Note that prior to V05.06 of RT-11, it is possible to software boot ONLY
DU0: of the physical disk drive based on the above 8 SET commands.
In general, for all versions of RT-11, for a hardware boot to work, PART=0
is essential and the command:
SET DUn: PORT=0, UNIT=n, PART=0
must have both "n" values the same, i.e. the hardware boot code is able to
read ONLY a specified UNIT number that is entered via DUn: while in
RT-11, the UNIT=n must also be identical for the hardware boot to work.
So you can hardware boot only PART=0 of each physical hard drive
using RT-11 unless you are willing to modify the boot code.
For V05.05 and later of RT-11, a SYSGEN is allowed which is able to
specify the use of an extended MSCP device driver with up to 64 RT-11
partitions, i.e. from D00: to D77: where the unit number looks like two
octal digits even though they are actually RAD50.
If you have more questions, please ask. There is a serious bug in RT-11
associated with the extended MSCP device driver.
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