2 Aug
2016
2 Aug
'16
10:48 p.m.
On Tue, 02 Aug 2016 21:43:03 -0700
Kirk Davis <kirkbdavis at me.com> wrote:
--
73 AF6WS
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"
Thanks for the suggestions. I?m in Sunnyvale, CA.
I actually got the rx02 from another hobbyist that
used it with the 44 in 2008 so I suspect it is configured correctly.
The other drive doesn?t have a belt so I?m unable to test with it.
I?ve verified the cable direction. It?s a sweet 44 - super clean,
runs great and is like a tank.
One of the problems is I don?t know normal behavior of the drive. The
motor is aways spinning for unit 0. When I try booting I don?t hear
the heads load or seek. I?m new to the 44 monitor commands & boot
process etc so I?m learning as I go.
The motors always spin. The heads should engage whenever selected.
You;ll hear a serious "clunk" when they load.
If you're coming to the VCF this coming weekend, Bob Rosenblum and I
will have a running RX02 attached to a PDP-8/M. You can hear all of
it's "sounds" there. You'll also be able to play "Spacewar!"
with our
VC8/E and XY monitor, etc.
BTW: Make sure you have the correct switch settings on the RX02
mainboard for your PDP-11...
I?m also making one of these to help isolate if it?s
a
drive/cable/controller problem:
http://www.torok.info/computing/pdp11/rx02/index.htm
That looks like a cool project. Would like to see it when you've got it
running!!!
Lyle
On Aug 2,
2016, at 3:24 PM, Paul Anderson <useddec at gmail.com> wrote:
Hi KIrk,
The H771 is a rock solid power supply. I never saw one go bad while
in field service, but they are getting old. Checking the output
voltage and ripple is not a bad idea.
forgive me for asking, but where are you located? The RX02 had 4
different power hanesses for i20, 220, 50 hz and 60 hz. Also
different belts amd pulleys. if any of this is wrong you cn see
weird problems. A lot of RX02s and replacement drives were soul
through brokers who never asked or were never told where the unit
was going. if you aren'y useing 120/60 that would be my first
thought.
Is the problem the same when booting off either drive? Also check
the switches and the resistors on the head cables.
Good luck, Paul
Jerry Weiss wrote:
If you haven?t already, check the cable seating, orientation and for
bent pins.
On the RX211 board J1 - TT is the location of the AC LO - Active
Low signal.
On Tue, Aug 2, 2016 at 4:06 PM, Kirk Davis <kirkbdavis at me.com>
wrote:
> I?m a noob using RX02?s but thought I?d run this past people that
> may have debugged them in the past and see if they agree with what
> I?m finding:
>
> I?m trying to get a RX02 + RX211 + 11/44 going. The RX02 appears
> to power up OK (fan and motor spinning). I verified I have the DY
> boot rom in the 44. Attempt booting from the console:
>
>>>> b dy
>
> S
> 17777707 173436
>
> Which halts in the DY boot rom. I look at the base RX211 register:
>
>>>> e 17777170
> 17777170 104040
>
> From the manual this like the controller is present but the high
> order bit is set indicating an error
>
> Looking at the status register;
>
>>>> e 17777172
> 17777172 000010
>
> Bit 3 == RX AC LO - This bit is set by the interface to indicate a
> power failure in the RX02 sub- system.
>
> So start looking at the RX02 power supply?
>
>
>