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? Thanks, Toby On Fri, 2009-02-13 at 15:27 -0500, Paul Koning wrote: -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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 physical 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. Jerome Fine