[cctalk] Re: Looking for a bootloader

Anyone here familiar with programming the 11/23 (KDF11-A) in assembler, bare metal? I have been trying to get a very simple test program to run on it but it keeps halting on an address outside of the program. Seems to always be the same address which is why I am thinking I must be missing something. The program runs fine on an 11/23+ or 11/70. Below is the listing: 1 000000 .asect 2 014000 .=14000 3 014000 012706 002000 start: mov #2000,sp 4 014004 000240 loop: nop 5 014006 000776 br loop 6 .end I have a hardware 11/23 but for convenience I have been testing on a SIMH 11/23 by loading the binary from the simh prompt and then jumping to the start address. I have tested the same code on 11/23+ and 11/70 CPUs and it runs fine. I am working in Linux and am using the following Macro11 cross-assembler: macro11 - portable MACRO11 assembler for DEC PDP-11 Version 0.8 (07 Jul 2022) Copyright 2001 Richard Krehbiel, modified 2009 by Joerg Hoppe, modified 2015-2017,2020-2021 by Olaf 'Rhialto' Seibert. I then use the obj2bin.pl utility by Don North to convert from object format to binary load format. The following is what happens: PDP-11 simulator Open SIMH V4.1-0 Current git commit id: 29d39002 sim> set cpu 11/23 sim> load test.bin sim> g 14000 HALT instruction, PC: 005271 (HALT) sim> Am I missing some initialization parts or something? I have looked through various manuals and the processor handbook for the LSI-11 but if it is in there, I am missing it.