On 2013-04-11 02:13, Christian Gauger-Cosgrove wrote:
Hello Mark,
On 10 April 2013 13:37, Mark Pizzolato - Info Comm <[email protected]> wrote:
Once again, anything is possible, but this would be a significant amount of
work. If there was some formal documentation available which described the
RS03 and RS04 disks, then adding them to the pdp11_rq.c code would probably not
be too hard. Looking in the 'usual places' on bitsavers.org doesn't provide
any information on these disk devices though.
Well it would be to the pdp11_rp.c code, but either way, they're just
another form of MASSBUS disk, and in my quick browse through the
pdp11_rp.c code, it looks likes like the various drives under its
purview are only defined as their geometries. So to add the RS03 and
RS04, all that would be needed to be added -- in my quick glance at
the code, would only require entering the proper geometry for the
devices.
There exists a couple of different types of Massbus disks, but I suspect
adding RS03 and RS04 would be very easy.
Meanwhile, there already exists support for many disks within the current simh
codebase. There is existing support for 4 RQDX controllers each of which can
support 4 drives. The RL controller can support up to 4 drives. The RP can
support up to 8 drives. The HK (RK611) can support up to 8 drives.
Speaking of the RK611, I noticed a problem, whereby an RK07 errors out
in RSTS/E (10.1-L) with "device not ready" or something similar, while
it works just fine with an RK06... weird.
There is only one set of drives that isn't implemented in SIMH at
present, is the pre-MASSBUS RP drives (on the actual RP11 controller,
so RP01, RP02 and RP03). But I don't think much if any still extant
software even supports the RP0[1:3].
RSX still supports them, and I suspect the same is true for RSTS/E and
RT-11, but I haven't checked. In RSX, it is the DP: driver.
But I don't know if all various types of disks that ever existed for
PDP-11s really are implemented in simh.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: [email protected] || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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