8 Apr
2011
8 Apr
'11
1:48 a.m.
Hello Mark.
I am restoring a PDP-11/34 and am currently adding
an RX-01 drive to it in order to boot RT-11.
Always nice.
I have already located a copy of RT-11 on an LSI-11
system
and have made a bootable RX-01 floppy (an M7946 was
installed on the LSI-11 to do this). This disk was tested on the
LSI-11 system by asserting BHALT, entering a bootstrap via
ODT, and booting from the disk (which was, at the time, the
only device): it boots properly and runs RT-11 version 5.04SJ
as expected.
OK, so far so good.
An M7846 RX-11 controller was installed in SPC slot 9
of the
11/34, the bootstrap loaded at 1000 via the front panel
(and verified), and a boot attempted.
When STARTed at 1000, the RUN light comes on, the RX-01
head engages (as evident from the solenoid),
That is because of the system reset. Every time you press the
buttons CTRL and INIT you reset the system and the heads will
engage / disengage (if you have the "calculator-style" keypad.
The 3-button panel version of the 11/34 has an INIT push button (?)
that shows the same behavior.
and you can hear the heads advancing a track or two
then it
stops: the "SR DISP" led and the RUN led go out, and the
display reads "005134". Examining the bootstrap area (1000)
shows the bootstrap was replaced by data.
Are you sure you hear the heads *stepping* ?
Does anyone know what the "005134" code
means?
I search through RT-11 docs and can't find anything on error
codes or such and I'm hoping this will help with the debugging.
That is not an error code but just the address where the CPU stopped.
By looking at the code you might be able to figure out what the
problem is. The RX11 (M7846) does not use DMA (NPR), so check
that the NPR wire on the backplane is present (pins CA1 - CB1) or
check that the RX11 module has connection by a trace on the
module between those 2 pins.
Thanks!
Professor Mark Csele, P.Eng.
Niagara College, Canada
300 Woodlawn Rd., L-23
Welland, ON, L3C 7L3
(905) 735-2211 x.7629
E-Mail: mcsele at niagarac.on.ca
URL: http://technology.niagarac.on.ca/people/mcsele
Author of "Fundamentals of Light Sources and Lasers", Wiley, 2004