3 Aug
2016
3 Aug
'16
12:43 a.m.
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.
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
Kirk
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?
>
>
>