-----Original Message----- From: CLASSICCMP(a)trailing-edge.com <CLASSICCMP(a)trailing-edge.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Thursday, February 10, 2000 8:58 PM Subject: RE: RX01 Bootstrap Loader It actually was as I have all the material before '78. I thought it might be in the PDP-11/05 manual but I could not get at it.. and pulling boxes of RT11 would be a lot more headache than asking someone here. I found that in my own collection :-) . I just saw the abereviated version. ftp://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/bootstrap s/ I saw that book was 1980. I checked 1976,78, peripheral handbooks.. no luck.. Processor handbooks also didn't help too much. I knew I saw it somewhere (prob. 11/05) but was not sure. Thanks for the help. I don't believe it will . Neither will RT11 V1. DOS/BATCH requires a minimum of 8K too! Even though RT11 only uses up 2K core it still won't load without 8K minimum. The only "OS" that supports 4K is "PTS-11". I needed to boot RX01s as that is a lot easier to run diagnostics across a bunch of 11/20s quickly... beats paper tape!. I have some old diagnostic disks/diagnostic code on RX01s for the 11/20. Most of the PDP-11/20s I am restoring have serial numbers under 400 so most manufactured at that time were configured with paper tape and 4K core. Most of the 11/20s I got were configured with paper tape/4k core. The *newer* ones have DECTape. I am testing all the PDP-11/20s after a basic rebuild with 4K core.. I will add more MM11-Es depending on what is requested. Due to the instruction set incompatibilities between the 11/20 and other 11s, will they even run RT11 V30B with 8K core? I expect most will probably just want PTS-11 and DOS/BATCH with an 8K core system. john PDP-8 and other rare mini computers http://www.pdp8.com