PDP-11 bootup

On 26/03/2009 05:34, John Floren wrote: M8192 is a dual-height KDJ-11A for an 11/73 and as Jerome pointed out that has no bootstrap. ?Possible reasons for being left at the ODT prompt include the HALT switch being on, or there being no bootstrap anywhere else. ?However, the next board, M7195, is a multifunction MXV-11B, which probably does have a bootstrap on it. ?Look for a pair of EPROMs on it. ?The manual is around the net, and I expect there's a copy on bitsavers.

The KDJ-11 doesn't have all the ODT commands that some earlier QBus processors have. ?"G" is the command to "Go" to an address. ?"P" is the command to "Proceed" without initialising the bus. ?The only other commands on a KDJ-11 are slash ('/'), 'R', carriage-return and linefeed. I don't know exactly what the next few boards are, though I know Matrox made video boards for a variety of systems (DEC and S100 at least) and a QRGB is some sort of framestore and QVAF is a digitiser, I think. ?The Dataram board probably is memory, especially if densely packed with an array of chips. ?The chips numbers should tell us. M7941 is a DRV-11 parallel interface, which might have been used for a printer or simply for some other digital I/O to/from another device. M7555 is an RQDX3 MSCP disk controller, which interfaces via a breakout board to a dual floppy drive and/or one or more ST412-style hard drives. ?Are there disks and cables in the system?

Thinking of that, what type of box is this in? ?What does the front panel look like? ?Jerome suggested it might be a BA23, but this mixture of cards suggests to me that it might just as well be a system that was upgraded from something older, and that it could be a BA11S or BA11N.