----- Original Message ----- From: &lt;healyzh(a)aracnet.com&gt; To: <classiccmp> or elsewhere. I know of four people that are looking for this information. There used to be a pdf of "EK-OLCP5-TM-001 Micro/PDP-11 System Technical Manual" on www.retrobytes.org, but that site is gone and the new owner of the domain name has no knowledge of the doc. I have not been able to find another copy on the web. Antonio Carlini has a copy of that pdf. He uploaded it to www.vararchive.org a couple days ago. I have not yet been able to find it at the archive. Evidently the maintainer hasn't got around to it yet. I know what that's like. I'll wait a few days before I bug him. Or perhaps, if the vaxarchive is going to be a problem, someone could provide a more appropriate place that Antonio can upload the doc to. Are vax.sevensages.org and www.vaxarchive.org the same place, different, or is one a mirror of the other? The vaxarchive address seems to be down at the moment. I have discovered the most needed information by following traces and by trial and error. I have the console connections and the baud rate jumpers documented at http://users.safeaccess.com/engdahl/PDP-11_53.htm. The board we are talking about is the M7554. The older layout is the one pictured in the Visual Field Guide. There is a picture of the newer one on my web page. The new one is a completely new layout, and can have up to 1.5 megs of RAM. I have found you can obtain one of these boards for around $50 on eBay -- either $50 for a board, or $10 for a DECserver 500 or 550 plus $40 shipping for all the iron around it. The DECserver 550 has the M7554-SD, with an 18 MHz, rev -09 CPU, and 1.5 megs onboard. The 500 has the M7554-PB, which is the older layout, with only .5 megs RAM. The CPU is -07. The field guide says the -PB is 18 MHz -- I have not yet verified this is true for my board. I haven't got around to burning the 11/53 ROMs yet, but that doesn't matter if you use a 3rd party disk controller with a boot ROM onboard. Change the address of the disk controller's boot ROM, and use ODT to boot from there. All three boards that I've tried so far have booted and run RT-11 just fine using this method. I used the -PB board to boot UNIX, and it seems to run fine. I ohmed out the DECserver front panel, and I'll get that info posted eventuallly. But you really don't need the front panel or ROMs to run RT-11 or UNIX, just the console connection. Cut off the end of a PC floppy cable -- it fits the console connector. It will even boot RT-11 with the ROMS removed. -- Jonathan Engdahl Rockwell Automation Principal Research Engineer 24800 Tungsten Road Advanced Technology Euclid, OH 44117 USA Euclid Labs http://users.safeaccess.com/engdahl