Hi Bruce, thanks for replying to my question. Perhaps you did not get my PM, so here an update on my latest state of knowledge: What I want to do is to run simple programs in stand alone mode, i.e. without starting RDOS. What I can for example is to run the factorial.al demo listed in the Algol manual without any problem in the RDOS environment (I fortunately got from you in 2012): algol factorial.al (Compile) rldr factorial.rb @library.cm@ (Link/Load) factorial (Execute) This nicely demonstrates the capabilities of the multi digit integer numbers of Algol. Now I want to run this as stand alone demo on a real machine (this machine only has 8k of memory and no disk/tape drives which prevents the use of RDOS on it). Therefore I have generate a stand alone binary. First step is to compile it according to the manual as usual, but thereafter the manual states that I will need SOS.SV to generate a trigger which is done by issuing the command "SOS SYSGEN" Additionally I will need the SOS.LB which contains the standard library functions of the stand alone operating system environment. This file should be more than 8000 Bytes in size (there exists a dummy SOS.LB which is much smaller). According to the manual the process of generating a stand-alone file on paper tape would be algol factorial.al (Compilie) sos sysgen (Generate Trigger for the stand alone system) rldr/c factorial trig @library.cm@ (Linker) mkabs/z factorial $PTP (Punch binary) I already successfully generated assembler stand alone files (which of course do not use the stand-alone operating system but are pure assembler code, e.g. the FigForth or own small programs). I'd be really happy if you can supply the stand-alone stuff and as stated above I think I will need tapes from the stand alone operating system and the SOS.LB. I just checked: Going the way of the stand alone Algol (i.e. without RDOS) also requires this SOS.LB and the trigger to generate loadable programs. But one additionally has the disadvantage of having to be a paper tape jockey - at least virtually in the simulation. Any help (tips or tapes) are highly welcome, many thanks, Erik. On Sun, 28 Apr 2013, Bruce Ray wrote: