[Simh] More on the RK611

[Johnny Billquist]

On 2013-08-31 21:52, Bob Supnik wrote:
> The RK611 is modeled as though it was a monolithic controller, a la the
> RP series, in which all the state in both the controller and the drives
> is interrelated and constantly interlinked. In fact, this is not true.
> The RK611 is a command-response model; status from the drive is only
> available in response to a command. Thus, when state in the controller
> is altered WITHOUT a command (eg, controller clear), the existence of
> state in the drives cannot be seen.
>
> What this means is that the update_hkcs  and update_hkds routines are
> basically wrong. The former can only look at state within the
> controller. The latter can only look at state within the drive.
> Information about drive errors is dynamic: it has to be captured when
> generated, and after that, from the point of view of the controller,
> "it's gone." In particular, if DTER (drive type error) is generated by a
> command, it "persists" in the drive, but the actions that resulted in
> the controller (setting combined error) are ephemeral. A subsequent
> controller clear will clear combined error, even though the "drive type
> error" still exists in the drive.
>
> So when errors are set, all related consequences (setting ATA if
> appropriate, setting CERR if appropriate) must be done at the time, and
> not in the master update_hkcs routine. update_hkcs can only deal with
> controller state.
>
> This will result in a lot of small changes throughout the HK simulator.
> I've started in, and the result passes an initial smoke test with RT11;
> but then again, RT always worked. The real tests are RSTS, RSX, and VMS.

Bob, I happen to have a simh instance with RSX running, that have RK07 
drives defined. RSX have been happy with it so far, but is there 
something specific you would like me to test, just let me know.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol