New finds and some h-11 help

--- "Zane H. Healy" <healyzh(a)aracnet.com> wrote: To a certain extent - the CPU should be at one end of the Qbus, the M9400 at the other. Other stuff is not so critical. The M9400 is at least a Qbus terminator if not a Qbus terminator and boot card... I forget what the "YB" designator means, and my H-11 is not in front of me (it has a KDF-11 "PDP-11/23+" CPU card in there, anyway). The WHA-11-16 is some third-party card with which I am not familiar. It is wierd - the backplane is upsidedown - the cards go in with the solder side up. It threw me for a loop the first time, too. Fortunately, I didn't "fix" the problem and power up. BTW, that 4x6 connector is Heathkit propietary. I have never seen one anywhere else except hanging up on the wall of the local electronics warehouse about 15 years ago back when that kind of connector was more common. It's a type of Molex connector. If you have _any_ DEC async boards, I'd pull the H-11-5 and go with a DLV11-J or the like. I have an H-11-5. It's *not* in the H-11. It's on the shelf. I do not have any docs, though, before you ask. I am stymied with the H-27 interface card. I have tested all the TTL ICs, but this thing still locks up the Qbus when it's plugged into the grant chain with no gaps. With gaps, it begins to read the floppy at boot time, but as soon as the boot code turns on interrupts, because the interface is in the wrong place, the system hangs, waiting for the interrupt that never comes. I've been working on other systems recently - a pdp-8/e and pdp-8/L, specifically. -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com