4 Jul
2005
4 Jul
'05
10:45 p.m.
Hi,
I'm trying to get one of my 11-23's going and finally
got around to setting up a TU58 emulator. got it
to boot RT-11 and now trying to get a RX-02 working.
I have 3 controllers and 3 sets of RX-02's. All do the same
thing. The just seems to not be able to find track 1 or Home
or ??? The heads just keep going from home to maybe the
first tack and back. The heads do load and the system tries
quit a few times then pauses and tries again. It then errors
on drive failure or read error directory not found, size
function failed depends what I ask it to do. I have tried all
of the boards and drives. all or them seem to do the same
thing. I do not know how good the drives are but can't
believe there all bad.
I have recheck the switches in the RX-02 and the Jumpers on
the cards. Cleaned the drives. tried different disks.
Is there some kind of compatibility issue that i do not know
about. Or do I have 6 dead drives.
The system is a Micro PDP 11, 8 slot Rack mount, with
1 M8189 1123+
1 M8067 KB 256k Memory
1 M8639 YA MFM rx50 controller
1 M8029 RX-02 controller in this order.
Everything else seems to work. I added the floppy card
but the rest original.
Thanks, Jerry
Jerry Wright
JLC inc.
6 Jul
6 Jul
11:49 p.m.
The system is a Micro PDP 11, 8 slot Rack mount, with
1 M8189 1123+
1 M8067 KB 256k Memory
1 M8639 YA MFM rx50 controller
1 M8029 RX-02 controller in this order.
Everything else seems to work. I added the floppy card
but the rest original.
I'm not a 'Qbus person', much prefering Unibus machines, but IIRC one of
the ST506/RX50 controllers (RQDX1 I think) had to be the last device on
the bus since it didn't pass on grants. If that's the controller you
have, then the RXV21 would mever get BGs or NPGs and woul;d probably do
what you're seeing. Try putting the RXV21 first...
-tony
7 Jul
7 Jul
2:08 a.m.
On 7/6/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Especially since the boot ROMs pull the boot sector off the floppy
without interrupts. You should see some activity, hear heads,
something, but no OS prompt. You could always check the contents of
low memory to see if the boot routine was able to pull the first
sector off the diskette.
In any case, you can't put the RVX21 behind the RQDX1.
-ethan
The system is
a Micro PDP 11, 8 slot Rack mount, with
1 M8189 1123+
1 M8067 KB 256k Memory
1 M8639 YA MFM rx50 controller
1 M8029 RX-02 controller in this order.
I'm not a 'Qbus person', much prefering Unibus machines, but IIRC one of
the ST506/RX50 controllers (RQDX1 I think) had to be the last device on
the bus since it didn't pass on grants. If that's the controller you
have, then the RXV21 would mever get BGs or NPGs and woul;d probably do
what you're seeing. Try putting the RXV21 first...
8:19 p.m.
I'm not a
'Qbus person', much prefering Unibus machines, but IIRC one of
the ST506/RX50 controllers (RQDX1 I think) had to be the last device on
the bus since it didn't pass on grants. If that's the controller you
have, then the RXV21 would mever get BGs or NPGs and woul;d probably do
what you're seeing. Try putting the RXV21 first...
Especially since the boot ROMs pull the boot sector off the floppy
without interrupts. You should see some activity, hear heads,
9:49 p.m.
On 7/7/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Err, yes, but data transfer on the RXV21 always used
DMA (NPR/NPG
signals). If the RXV21 never sees a non-processor grant, it'll never
transfer any data.
Ah, yes... I was thinking about the Heathkit H27 interface. Different
critical details. Mea culpa.
-ethan
7132
days inactive
7135
days old
4 comments
3 participants
participants (3)
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ard＠p850ug1.demon.co.uk -
ethan.dicks＠gmail.com -
g-wright＠att.net