Jerome Fine replies: You have what is called a DSD 880/8. You are correct as far as the hard disk drive is concerned. This drive is also quite heavy relative to the 8 MBytes of capacity. I recommend local pickup. After the media scare over SARS is finished by the end of April and the WHO admits it made a mistake by the end of May, you can come a pick up my DSD 880/8 in Toronto. I can also provide a DSD 880/30 after I dig it out from the pile. Unfortunately, both hard drives are no longer working. It also contains a SINGLE 8" RX03 floppy disk drive. The RX03 is compatible with the DEC RX02 floppy disk drive, which is both a SSDD (Single-Sided Double Density) and a SSSD (Single-Sided Single Density identical to the IBM 8" SSSD floppy disk drive media) when ONLY one side is used. The RX03 can use both sides in either Single Density or Double Density mode. As a result, when the appropriate device driver is available, the RX03 can hold up to 1976 blocks as opposed to only 988 blocks for the RX02 and 494 blocks for the RX01 (always only SSSD). The reason I know it is possible is that I also have a broken DSD 880/8 along with a probably broken DSD 880/30. The latter has the same RX03, but the hard disk drive emulated 3 * RL02 hard drives or 30 MBytes in total. NOTE: The DSD 880/8 and the DSD 880/30 can handle only 18 bit addresses on the Qbus. If the device driver in RT-11 is the standard one distributed from DEC, then there is no provision for 22 bit buffer addresses. However, I managed to modify the DYX.SYS device driver to handle BOTH the Double-Sided RX03 and 22 bit addresses, the latter with a bounce buffer within the device driver. Since at one point I used the RX03 as my primary backup device, having 1976 blocks with the RX03 as opposed to only 988 blocks with the RX02 was a big advantage. 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.