On 30/08/2017 17:02, Douglas Taylor via cctalk wrote:
On 8/30/2017 5:53 AM, Pete Turnbull via cctech wrote:
Hope this helps...
Yes, it does help. There are 3 issues that I am trying to resolve:
1. Running in 32kb of memory. If I use the 32kb MXV11 can I run RT11
V5.3?
If it works in SIMH it should be just the same on real hardware - modulo
any backplane bitness issues.
2. Bootstrap. I transferred the RT11 V5.3 to a DEC 535MB SCSI disk and
was able to boot it using an Alphatronix SCSI controller, it is a Viking
QDO rebadged. When I say is was able to boot it, I
connected it to a 11/53 CPU in a BA23 box just to test it out.
That has a J11 CPU, same as your 11/73, with the same registers. So I'd
be guided by others' comments on booting the UC07. You could of course
program the MSCP bootstrap and whatever else you need for setup into a
pair of EPROMs but that's perhaps not a good place to start.
3. 18 Bit addressing. It appears that the H9270 backplane I have has
been modified by DEC with wire wrap and soldered in connections. I
really, really don't want to undo any of that. I may have to settle for
just running an 11/23, 11/53 and 11/73 cpu in this box.
I doubt if it was done by DEC, unless some failed servoid did it as a
favour for the previous owner when upgrading it for the 11/23. It was a
common user upgrade, though.
--
Pete
Pete Turnbull
