Take it away for $100. I love when people say an item for sale was this many dollars new, well this is a real bargain cause it was about $100,000 new. What a steal!! LOL. Midtown NYC location. Thanks, Vinny

Jerome Fine replies: Since even V5.03 of RT-11 allows for up to 8 * 32 MByte partitions for the MSCP/DU(X).SYS device driver (the first version of RT-11 that did provide for partitioned MSCP devices, you should really enjoy an ESDI hard disk drive. If you do find a drive that is more than 256 MBytes or eight partitions, you can still use the extra "devices" as data volumes under V5.03, but just not at the same time since the limit in V5.03 is eight drives at one time (DU0: => DU7:) out of the 256 possible partitions on an 8 GByte hard drive (I guess that would be SCSI - not ESDI). Of course, if you have V5.05 of RT-11 or later, that allows up to 64 partitions at one time after you do a SYSGEN. The PDP-11/83 that I have available has 3 * 600 MByte ESDI hard drives. Eventually I hope to add a 4th drive for scratch use - the RQD11-EC quad controller allows only the first three drives to be WRITE PROTECTED with a passive front panel - I use an alligator clip connected to the correct wire on the 10-pin connector tied to ground at all times except when I decide to write something to be saved on the hard drive - if you are using the drive as the system device and you don't like the error messages about the SWAP.SYS file, then "SET EXIT NOSWAP". One minor problem is that until after V5.04G of RT-11, there was no possibility of booting (even a software boot using DUP) since the boot code had ONE missing instruction to set up the partition number. I have fixed that in my version of DU(X).SYS for V5.04G and could easily do so for V5.03 as well. In V5.06 of DU(X).SYS, the ONE instruction has been added to the boot block code, but you can still boot only the first eight devices via DUP (DU0: => DU7:) since there are only eight entries in the boot block for the required map. I have also fixed that in my version of DU(X).SYS for V5.06 of RT-11 and can now boot D00: => D77: via DUP. The reason I found this aspect important is that with the 3 * ESDI 600 MByte hard drives, is use: D00: => D23: for the first 20 partitions on physical unit 0 D30: => D53: for the next 20 partitions on physical unit 1 D60: => D83: for the next 20 partitions on physical unit 2 with ASSIGN D54: D80: ASSIGN D55: D81: ASSIGN D56: D82: ASSIGN D57: D83: and when I add a small ESDI scratch drive as unit 3 which can't be WRITE PROTECTED, I will use: D90: => D93: for the remaining 4 available partitions on unit 3 with ASSIGN D24: D90: ASSIGN D25: D91: ASSIGN D26: D92: ASSIGN D27: D93: so that everything is easy to see and understand and all the drive numbers have a bit of sense and order. If you don't understand any portion of the above, ask some questions. I hope the hardware works for you. Sincerely yours, Jerome Fine

from that %^(*$&#^@(%) Snowhite (W32-Hybris) Virus, so if you do reply

Since even V5.03 of RT-11 allows for up to 8 * 32 MByte partitions for the MSCP/DU(X).SYS device driver (the first version of RT-11 that did provide for partitioned MSCP devices, you should really enjoy an ESDI hard disk drive. If you do find a drive that is more than 256 MBytes or eight partitions, you can still use the extra "devices" as data volumes under V5.03, but just not at the same time since the limit in V5.03 is eight drives at one time (DU0: => DU7:) out of the 256 possible partitions on an 8 GByte hard drive (I guess that would be SCSI - not ESDI).