PDP-11 bootup

The Data Systems Design A44324 board is to interface a DSD440 to a Qbus. ISTR the other DSD board is probably another DSD440 interface - they also made them for Unibus and Omnibus. -- Ian ________________________________________ From: cctalk-bounces at classiccmp.org [cctalk-bounces at classiccmp.org] On Behalf Of Pete Turnbull [pete at dunnington.plus.com] Sent: Thursday, March 26, 2009 1:32 AM To: On-Topic and Off-Topic Posts Subject: Re: 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. You appear to have boards from at least three systems... This is a terminator board for a much older QBus system. Each is an RXV11 controller for a dual RX02 8" floppy drive - not useful unless you also have those specific drives. I don't know, but I'd guess some Texas Instruments GPIB/IEEE-488 instrument interface, like DEC's IBV11. Older QBus memory card from an 11/23 or possibly 11/03 system. There will be a suffix to the 8045 that will tell us the size of each. The have parity, so possibly from an 11/23. Dunno. DLV-11J quad serial line cards, mainly used with 11/03 and 11/23 systems. Later versions were renamed DLVJ1. They'd probably work (depending on the revision level) with your 11/73, but as you have two serial lines on the MXV11, probably not very useful. Another KDJ-11A CPU. Dunno. Another MXV-11 multifunction card. MSV-11L memory from an early microPDP-11, either 128KB or 256KB. This is an old dual-height LSI-11/2 CPU from an 11/03 system. Dunno. Terminator for that LSI-11/2 processor system. Does the number have a suffix? There were several version, some with bootstraps. Here you have the upper halves of four RLV11 disk controllers. These each need to be paired with an M8014 to do anything. They're from an 11/03 or early 11/23 system. A DL-11W serial line and line-time clock from a Unibus system. Don't plug this in to your Qbus! Matrox framestore, I believe. -- Pete Peter Turnbull Network Manager University of York