I have a Seagate ST-225 that I want to put into my Micro PDP-11/73. At the
moment I am just trying to see if the disk works at all and if I can format
it in a MicroVAX 2000. It spins up but the TEST 70 and TEST 71 commands fail
on it, unable to determine the type of disk. There are some jumpers for
which I have found some documentation here:
http://stason.org/TULARC/pc/hard-drives-hdd/seagate/ST225-21MB-5-25-HH-MFM-S
T412.html, but I am not sure which is pin 1, and I am not sure what settings
the MicroVAX 2000 wants, or if it needs the resistor termination pack.
Can anyone tell me which jumper settings I need for the disk to work in a
2000? And whether I need the resistor pack installed?
Thanks
Rob
On 2012-12-30 23:00, Glen Slick<glen.slick at gmail.com> wrote:
> On Sat, Dec 29, 2012 at 3:44 PM, Jerome H. Fine<jhfinedp3k at compsys.to> wrote:
>> >
>> >So the quick answer is probably that all M8190 boards are PMI capable, but
>> >the PMI is not activated if PMI memory is not present in the correct
>> >slot(s).
>> >In addition, probably all M8190 boards are happy being placed into a VT103
>> >backplane which will not support PMI activation.
>> >
>> >Of course, I can't guarantee there won't be magic smoke released if the
>> >M8190-AE
>> >is placed into a VT103 backplane.
>> >
> I remain skeptical that everything will just be fine if you place an
> M8190 KDJ11-B into a non-Q22/CD backplane.
>
> If you look at Table 2-9 (page 2-19) and Table 2-10 (page 2-20) in
> EK-KDJ1B-UG_KDJ11-B_Nov86.pdf, won't placing an M8190 into a
> non-C22/CD backplane essentially connect the CA1-CV1 signals in Table
> 2-10 straight through to the AA1-AV1 signals in Table 2-9, and same
> with the DA1-DV1 signals and the BA1-BV1 signals? That doesn't seem
> like something that would allow normal functioning.
I think you are right, Glen. The M8190 is intended to sit in a Q-CD
slot, not a Q-Q. I'd surprised if it works.
However, if you ever want to put an M8190 in a VT103 you need to rewire
the backplane anyway, as the VT103 backplane don't even do Q22 if I
remember right.
> Also, it is clear from Table 2-10 that the PMI signals on the M8190
> only exist on the top (component) side of the board and can only
> communicate over the PMI with memory boards physically located above
> the M8190.
Correct. The PMI memory for PDP-11s work in both Q-CD slots and PMI
slots, but they only perform as PMI memory if they sit above the CPU in
a Qbus backplane.
I'm not sure the PMI memory boards would work in Q-Q slots either...
Johnny
About John's design
If I understand correctly, your are using one of the newest Xcore product,
I guess, mainly for USB "full access", and this new chip is not yet
available, is it ?
Question, because your project seems very interesting to me :
Why did you chose that Xcore product, versus already available
chips like PIC 32 ?.
I am NOT a specialist about chips, but I do not see much difference between
the two,
USB speaking.
Do you take advantage of the multi-core chip ??
To me ( again, I am not a specialist, so pardon the question ) Is complexity
of multi cores
chips "justified" for that kind of interface ?
I mean architecture and compiler learning complexity balanced versus
advantages ??
Or is it just for the learning fun ;-)
Dear Mr. Watzman
I am an IMSAI 8080 owner from Switzerland.
Currently i look for an IMSAI FDC floppy system with CalComp 140 drives.
I startet my search for this floppy system several years ago, but i could never found it.
Now, i'm googling on IMSAI FDC and your name is the first result what i see.
I contact some peoples (Todd Fischer, Herb Johnson, John Monahan and Howard Harte (who never answered)) and some others.
Well, did you now who has one of these and they are willing to sell?
Thanks in Advance
Matt Schoeller
Switzerland
