Jerome Fine replies: Device drivers for RT-11 are identical for FB and SJ (or SB) monitors. The XM (RT11XZ monitors use the same device drivers as XM) device drives are a bit different. If you feel that MSCP emulation (probably OK now that the patent has expired) is too much trouble, then perhaps the HD(X).SYS protocol from E11 would be easier. I suspect that the protocol is so basic, the concept might be included within other interface such as for RK05 or even a floppy. Whatever interface protocol you use, if you want to extend the number of RT-11 devices that are allowed, I would be very interested in looking at allowing up to 256 devices using MSCP under RT-11. Naming might be the problem: D00: => D77: where the numbers seem to be octal allows up to 64 devices. Using D00: => DFF: where the second and third character seem to be hex would allow 256 devices. Alternatively, using D00: => D7V: where the third character has 32 values including 0 => 9 and A => V. The other possibility is to use multiple sets of hardware registers that look like multiple controllers under RT-11. And since even 256 RT-11 devices of 32 MBytes each covers only 8 GBytes, multiple controllers may be required in addition to allowing 65536 RT-11 partitions per drive by changing the table that holds the RT-11 partition number to a 16 bit word be a problem since the unit number is already limited to a single byte even though a 16 bit word is available. Swapping the unit number word with the partition number byte should be reasonable and quite simple. Producing RT-11 bug fixes and enhancements is on my list of priorities. Y3K is at the top of the list. Does anyone else want to participate? There are only 92 more years left. If one additional word is allowed for the date, that would mean that 23 bits are available for the year. Likely that should be enough for a while since the CE use of 97 leap days out of 400 will certainly need to change before 8 million years. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.