11 Dec
2006
11 Dec
'06
10:19 p.m.
Hi folks,
I have found the Motorola 68764 EPROM to make new boot ROMs for my
PDP11/23+.
Everybody seems to discuss the use of KDF11-B3, KDF11-BG etc. and MSCP
devices.
But what avout RK06/07?
In my system I have an Emulex SMD controller which emulates RK06 (with
other disks also RK07) drives, an RX02 and a SCSI controller doing the
DU MSCP thing. Everything works fine.
Only booting is problematic. I have to choose what I want to do by
configuring my cards:
* For DU, I have to enable auto boot on controller and CPU, nasty thing.
Makes booting SCSI possible - but only that.
* For RK (DM), I have to use the controller's ROM and to disable the LTC
on the CPU. Don't know if there's a line clock on the controller or how
to enable it. In that configuration I can boot DM and DY - but no DU
* With original PROM I can only boot DY on my system.
I want an original PROM image which does all the three. Does that exist?
If yes, please let me know. It would be very nice to have a machine with
the possibility to choose between all available boot devices on start
up. With the nice BOOT> prompt etc.
Thank you very much,
Philipp :-)
--
http://www.hachti.de
12 Dec
12 Dec
3:51 a.m.
On 12/12/2006 06:19, Philipp Hachtmann wrote:
Everybody seems to discuss the use of KDF11-B3, KDF11-BG etc. and MSCP
devices.
But what avout RK06/07?
In my system I have an Emulex SMD controller which emulates RK06 (with
other disks also RK07) drives, an RX02 and a SCSI controller doing the
DU MSCP thing. Everything works fine.
Something like an SC/02 or SC/03? I have one of each of those.
However, AFAIK DEC never made a QBus boot PROM that supported RK06/7,
because there was never a DEC RK06/7 controller for QBus -- only for
Unibus (RK611). The only solution would to change the PROMs on the
Emulex controller so that instead of emulating RK06/7 it emulates
something else that a DEC bootstrap does exist for. There are several
versions of both SC/02 and SC/03, including MSCP and RL emulations, but
whether you can just change the PROMs I don't know. It's probably
easier to get a different board.
* For DU, I have to enable auto boot on controller and
CPU, nasty thing.
Makes booting SCSI possible - but only that.
* For RK (DM), I have to use the controller's ROM and to disable the LTC
on the CPU. Don't know if there's a line clock on the controller or how
to enable it. In that configuration I can boot DM and DY - but no DU
I can't remember if the Emulex controllers have an LTC -- and my manuals
are at home while I'm at work ATM -- but if they tell you to disable the
one on the KDF11-B I'd assume it's so they don't fight. There's a good
collection of Emulex manuals on bitsavers.
* With original PROM I can only boot DY on my system.
I want an original PROM image which does all the three. Does that exist?
DU and DY, yes, but not DM. And you may find that the SCSI controller's
DU boot is specific to that card; it probably won't boot any other card
because it may not be a real bootstrap: some third party cards just
detect the attempt to start the bootstrap at the standard address and do
the rest themselves. I don't know whether it would boot properly using
the normal DEC DU boot code, but you could try it.
You might be able to change one of the bootstraps to respond to an
alternate address, which would allow you to enable two bootstraps, and
use ODT to jump to the "alternate" one.
--
Pete Peter Turnbull
Network Manager
University of York
6585
days inactive
6585
days old
1 comments
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participants (2)
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hachti＠hachti.de -
pete＠dunnington.plus.com