Q-bus to CF [was: IOmega]

Jerome Fine replies: I am not sure if this suggestion is easier or even useful. the DU(X).SYS MSCP device driver in RT-11, there may be an easier implementation that is just as useful. John Wilson set up an interface for an HD(X).SYS device driver under Ersatz-11 in order to provide variable sized devices until the MSCP emulation had been coded. While John's version of HD: needs a bit of modification to work well with mapped monitors, it is still only for RT-11. On the other hand, for the past 6 months, I have been adding additional features which include being able to handle full 22 bit Qbus / Unibus interface for mapped monitors. The real HD: advantage is the simplicity of the interface. While there are 8 I/O registers, setting them up when interrupts are not used takes less than 20 PDP-11 instructions including the 22 bit address. If you look at the hobby version of E11, John includes the code for HD(X).SYS for RT-11, although as I mentioned some changes are needed for mapped monitors when the user buffer is above 1/4 MByte. If anyone ever produces a Qbus / IDE (or any other PC current drive) controller, I will gladly enhance the HD(X).SYS device driver for RT-11 to use a DU(X).SYS translation type table. 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.