18 Nov
1999
18 Nov
'99
6:35 a.m.
--- "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.
1. Digital
M7264
PDP-11/03 processor
2. H-11-5 Serial i/o
3. H27 Floppy i/o
4. H-11-5 Serial i/o
5. M8044 CB
16 KW RAM
6. M9400 YB
120-ohm Terminator
> 7. WHA-11-16 16k x 16k Memory
>
>First question, does it matter how these boards are plugged into the
>backplane? If so, where do they go? What are boards #6 and #7?
The
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.
Well, I would think that 6 & 7 are reversed, but
I'm not familair with the
H-11, so there might be soemthing wierd going on there.
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
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18 Nov
18 Nov
8:24 a.m.
Upon the date 12:35 PM 11/18/99 -0800, Ethan Dicks said something like:
Hmm, I gotta find an old Molex catalog (IF I kept an old one in my design
library still stored in boxes). Seems it was a rather familiar type from
our using Molex products at my ex-employer.
--- "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.
That's the Heath-designed memory card. The "W" means it was factory wired
and tested.
1.
Digital M7264
PDP-11/03 processor
2. H-11-5 Serial i/o
3. H27 Floppy i/o
4. H-11-5 Serial i/o
5. M8044 CB
16 KW RAM
6. M9400 YB
120-ohm Terminator
> 7. WHA-11-16 16k x 16k Memory
>
>First question, does it matter how these boards are plugged into the
>backplane? If so, where do they go? What are boards #6 and
#7? The
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. Well, I would think that 6 & 7 are reversed,
but I'm not familair with the
H-11, so there might be soemthing wierd going on there.
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 got two complete H-11 systems but have not yet got them running. Back
burner project setting with all the others. Should get to them I guess so's
I could help several here who have them. I could look up stuff if either of
you need info. Seems Allison has had one for years that she hotrodded with
a better CPU, etc.
I've been working on other systems recently - a pdp-8/e and pdp-8/L,
specifically.
Well, that should keep one busy for a spell :-)
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.antiquewireless.org/
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