24 Jul
2016
24 Jul
'16
2:29 p.m.
On 7/24/2016 8:06 AM, william degnan wrote:
On Jul 24, 2016 8:58 AM, "Jerome H. Fine"
<jhfinedp3k at compsys.to> wrote:
Thanks for the details. I had been trying to boot rt-11 v5.3 on a 16k
core
11/40 using RL11 (rl02) and it did not work. The system was unable to
complete the initialization. CPU diagnostics passed, I could load BASIC
papertape. RL11 working correctly. In this context I posted my question.
After I posted my message here I loaded up simh and emulated an 11 with
32k. RT-11 v5.3 disk boots. When I re-built the system and reduced to
16k, I could not boot, bombed.
One thing to remember is 16KW in a pdp11 is not the same thing that simh
refers to when one sets the CPU to 16K. WWW do not all make this
distinction clearly. I get it, just making this comment for future readers
of this thread.
Bill
RT-11 v5.03 single job monitor boots fine and runs in just 32KB (16KW) of memory.
You need to be more specific about how you specify the memory configuration
(words vs bytes).
DEC routinely specified everything in KW (words) but most users and tools use KB
(bytes) nowadays.
Note that to force RT11SJ (vs RT11FB) to boot on the below image I booted first
using FB
in a larger memory configuration, did a:
COPY/BOOT DL1:RT11SJ.SYS DL1:
to force it to boot using the SJ monitor the next time.
Don
PDP-11 simulator V4.0-0 Beta git commit id: 4065f47f
CPU 11/34, FPP, idle disabled, autoconfiguration enabled
32KB
NOTE: ctrl-E to exit to SIMH monitor
sim> boot rl1
RT-11SJ (S) V05.03
.sho all
RT-11SJ (S) V05.03
Booted from DL1:RT11SJ
USR is set SWAP
EXIT is set SWAP
KMON is set NOIND
TT is set NOQUIET
ERROR is set ERROR
SL is set OFF
EDIT is set KED
KMON nesting depth is 3
PDP 11/34 Processor
32KB of memory
FP11 Hardware Floating Point Unit
Extended Instruction Set (EIS)
Memory Management Unit
60 Cycle System Clock
> On Wednesday, July 20th, 2016 at 18:02:44 -
0400, william degnan wrote:
> Is there a minimum memory requirement for RT-11 v5? I was discussing
with
Ray
Fantini about it today, unsure...anyone know if 16K will work (from
000000).
Bill
You need to be more specific! Starting with V05.00 of RT-11 in 1983,
there were a total of 17 versions released up to V05.07 in 1998, including
sub-versions V05.01B, V05.01C, and V05.04A to V05.04G of RT-11.
Up until V05.05 of RT-11, RT11SJ.SYS required the least memory which
was replaced with RT11SB.SYS for V05.06 and V05.07 of RT-11.
Attempts to boot from RT11SJ.SYS under V05.00 of RT-11 with 24K
bytes of memory were successful. Attempts to boot with 16K bytes of
memory were unsuccessful. An RK05 was used as the disk drive since
it is close to the smallest device driver. The answer to your question
about using 16K bytes of memory is NO for all versions of RT-11 starting with
V05.00 or RT-11.
Attempts to boot from RT11SJ.SYS under V04.00 of RT-11 with 24K
bytes of memory were successful. Attempts to boot with 16K bytes of
memory were also successful. An RK05 was used as the disk drive. The
error message "Insufficient memory" is displayed, but some useful work
might be done with just 16K bytes of memory. However, you did not
ask if useful work being done was one of the criteria?
NOTE that I used the Ersatz-11 emulator to check the above details,
so there might be a difference with actual hardware.
If you have any more questions, please ask.
Jerome Fine