XXDP on a really small system?

[Robert Armstrong]

  I have an 11/03 (unmapped, of course) with 28kW memory and two DLV11s.
I'm trying to build an XXDP image on TU58 that I can boot on this system,
using an XXDP 2.5 RL02 image and simh.

 

  My simh configuration is -

 

CPU     11/03, NOEIS, NOFIS, BEVENT disabled, autoconfiguration enabled,
idle disabled

.

TTI     address=17777560-17777563, vector=60, BR4

TTO     address=17777564-17777567, vector=64, BR4

TDC     controllers=1, address=17776500-17776507, vector=300*, BR4, 2 units 

.

RL      RLV12, address=17774400-17774411, vector=160, BR5, 4 units

 

  I can boot from the RL02 OK -

 

MEMORY MANAGEMENT UNIT NOT FOUND

 

BOOTING UP XXDP-SM SMALL MONITOR

 

XXDP-SM SMALL MONITOR - XXDP V2.4

REVISION: D0

BOOTED FROM DL0

28KW OF MEMORY

NON-UNIBUS SYSTEM

 

RESTART ADDRESS: 152010

TYPE "H" FOR HELP

 

But running UPDAT to create a new system image on the TU58 dies

 

.R UPDAT

UPDAT .BIC

 

HALT instruction, PC: 000010 (000012)

 

If I change the CPU to an 11/23 (but keep the same memory and other
configuration) then UPDAT works.   Is there some issue or limitation in
running XXDP on a 11/03?  Is it just UPDAT that doesn't work, or are there
bigger problems?

 

Thanks

Bob