flash (or ide) storage for unibus 11?

On Nov 25, 2015, at 10:41 PM, Jerome H. Fine <jhfinedp3k at compsys.to> wrote: ?? For example, the DSD 880/30 (from Data Systems Design of course) emulates 3 RL02 disk drives using a single internal (non-removable) hard drive. The box also holds a single RX03 floppy disk drive (8" floppy disk drive which supports using single-sided media specified by DEC as an RX02 floppy in addition to media which have the same physical interface, but which are double-sided). For a Qbus system, the dual module controller was the interface to both the three RL02 hard drives and the single RX03 floppy drive. I don't know if DSD also made a separate controller for the Unibus for the DSD 880/30. With regard to the address support by the controller for the Qbus, the floppy drive definitely supported only an 18-bit address. That 18-bit ONLY support by DSD was identical to the 18-bit support that DEC provided for its Qbus controller for the RX02, so both DEC and DSD needed a bounce buffer managed by software to support the RX02 floppy disk for systems with more than 256 KB of physical memory. As for DSD support for the RL02 for a 22-bit buffer address, a quick look at the DSD manual was not able to say one way or the other. However, it seems more likely the the DSD controller for the RL02 supported ONLY an 18-bit address. I have all the DSD hardware, but it is not operational at this point. If anyone else has experience with the DSD controller for the emulated RL02, let us know if there was 22-bit address support for its emulated RL02 drive. Jerome Fine