16 Nov
2021
16 Nov
'21
7:05 p.m.
On 2021-11-16 18:54, Dave McGuire wrote:
? It sounds like MAGICA is much bigger.? We don't yet have a Unibus
expansion chassis connected to FANG, so we have limited Unibus slots.
There's an RL02 and an RX02 in its rack, but no place for their
controllers to live.
What? You only have the four slots in the CPU backplane? That's a rather
unusal and limited 11/70 setup.
On 11/16/21 11:54 AM, Johnny Billquist wrote:
Yes it does.
Sources are on MIM. See
MIM::HECNET:DDB.C
and
MIM::HECNET:DDBDTR.CMD
(Yes, DDB itself is written in C.)
.ddb fang
? Speaking of ddb, does it do a DTR query across the network to access
the data?? Or something else? ?? Sure.? It currently only runs RSX-11M-PLUS v4.6,
but eventually
we'll set up RSTS/E, RT-11, and 2.11BSD system disks for it.? I
suppose the only other one that will appear on HECnet is RSTS/E.? The
goal for that machine, with its quad pack of RA73s, is to cover most
of the OSs that people may want to run.
Similar hardware as Magica then. Magica have four RA73, TU81, RL02,
DELUA and 3.5M of memory. Oh, and a paper tape punch and reader, and
an RX02. I think that's it... Might be a DH11 in there as well, but
nothing hooked up to those lines normally. ? We have a Unibus expansion chassis in an adjacent
rack that is ready
to be connected to Fang, but it just hasn't been done yet. (not enough
hands to do the work)
I think it was pretty much standard that you had at least one BA11 box
in any 11/70.
? We also have an Emulex SC72 disk controller
(actually a few of them),
which is a board set that plugs into RH70 slots and implements an SMD
interface.? We have a Fuji Eagle prepped and ready to go onto that, but
we still need to cable it up, format it, etc.? I expect that to be much,
much faster than the UDA50+RA73.? Hopefully we'll get to that sometime
this winter.
That could potentially be much faster, yes.
I haven't done any tests, but I suspect even some SCSI on the 11/70 and
some modern disk would be a big improvement. I think seek times on the
RA73 isn't that great.
But the Unibus on the 11/70 is also known as possibly the slowest Unibus
around.
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