So I have this DEC RK8E board set - and it has an extra card. The
normal set is M7104, M7105, and M7106 - but this one has M7107 (called
"WORD COUNT" on the etch) attached to a very official DEC looking
cable harness with the connecting blocks.
I thought the M7107 went with the RK07, and I thought the RK07 was
never attached to PDP-8 systems.
Does anyone have any thoughts on this?
And I still want a couple of RK07s.
--
Will
On Apr 19, 2014, at 12:00 PM, Fred wrote:
> There are exactly two kinds of people in the world: those who insist on
> dividing everybody up into two groups, and we who do not.
http://dotsub.com/view/c2084af6-a6b8-4b5c-abd8-11946f8c624c/viewTranscript/…
at 02:41.
*Great* quote! And I see what you did, with the title, there.
- Mark
> Message: 24
> Date: Fri, 18 Apr 2014 10:26:05 +0200
> From: Anders Sandahl <anders at abc80.net>
> To: cctech at classiccmp.org
> Subject: PDP-8a Power distribution box schematics
>
> Hi,
>
> I'm looking for the schematics to the power distribution box that use to
> sit in the bottom of the rack. I have browsed bit-savers.org but I don't
> know where too look. Can anybody give me a clue?
>
> http://www.abc80.net/docs/pdp8/pdp8a/DSC_2287.JPG
> http://www.abc80.net/docs/pdp8/pdp8a/DSC_2291.JPG
>
> Problem for this one is when putting the switch in local mode the big
> relay (contactor?) is activated, bit after a white it starts to jumps
> between activated/deactivated. I measured the voltage over the coil and
> it decreased rapidly when it happens. The contactor is tested standalone.
>
> I have cleaned this up and repainted it, but have no pictures after the
> refurbishment.
>
> /Anders
Is it the one shown in
http://z80cpu.eu/mirrors/oldcomputers.dyndns.org/rechner/dec/manuals/decima…
starting on PDF page 16?
Bob
A while back I stumbled across a handy little website that had board
outlines, jumper info etc. for ISA NICs - but for some reason I didn't
bookmark it. Sound familiar to anyone (the site, not the failing to
bookmark something useful)?
I'm looking out for an NIC that will work in one of my XT machines; I was
given another five* boards yesterday, but the maker/model info on four of
them isn't obvious - they're all 16-bit ISA boards, but there's a chance
that one of them might work in 8-bit mode on an XT bus.
* well, six if you include the IBM token ring card.
cheers
Jules
I seem to recall that there are a number of people on the list who are interested in Microsoft Xenix.
For anyone who's so inclined, I just posted a short article that includes a reasonably definitive list of all the platforms and releases of Xenix (up to Microsoft's exit from the business), the original Xenix announcement, a brief digression about how close we came to getting Xenix instead of OS/2, and a couple of other related stories: http://seefigure1.com/2014/04/15/xenixtime.html
"Microsoft is pleased to announce there will be no 16-bit software crisis"
Regards,
Rob
Hi there,
I've seen a similar problem and have a schematic that I can send you in a day or two when I get to it. It may be due to leaky cap on the back panel because the relay is actuated by 5v that oscillates.
Shaun
Sent from my T-Mobile 4G LTE Device
<div>-------- Original message --------</div><div>From: Al Kossow <aek at bitsavers.org> </div><div>Date:18/04/2014 7:29 PM (GMT-06:00) </div><div>To: cctalk at classiccmp.org </div><div>Subject: Re: PDP-8a Power distribution box schematics </div><div>
</div>On 4/18/14 1:26 AM, Anders Sandahl wrote:
> Hi,
>
> I'm looking for the schematics to the power distribution box that use to sit in the bottom of the rack. I have browsed bit-savers.org but I don't know where too look. Can anybody give me a clue?
>
> http://www.abc80.net/docs/pdp8/pdp8a/DSC_2287.JPG
> http://www.abc80.net/docs/pdp8/pdp8a/DSC_2291.JPG
>
> Problem for this one is when putting the switch in local mode the big relay (contactor?) is activated, bit after a white it starts to jumps between activated/deactivated. I measured the voltage over
> the coil and it decreased rapidly when it happens. The contactor is tested standalone.
>
> I have cleaned this up and repainted it, but have no pictures after the refurbishment.
>
> /Anders
>
>
DEC-00-H861A-A-D 861-A,B,C Power Controller Maintenance Manual.pdf
Hi,
I'm looking for the schematics to the power distribution box that use to
sit in the bottom of the rack. I have browsed bit-savers.org but I don't
know where too look. Can anybody give me a clue?
http://www.abc80.net/docs/pdp8/pdp8a/DSC_2287.JPGhttp://www.abc80.net/docs/pdp8/pdp8a/DSC_2291.JPG
Problem for this one is when putting the switch in local mode the big
relay (contactor?) is activated, bit after a white it starts to jumps
between activated/deactivated. I measured the voltage over the coil and
it decreased rapidly when it happens. The contactor is tested standalone.
I have cleaned this up and repainted it, but have no pictures after the
refurbishment.
/Anders
http://classiccmp.org/pipermail/cctalk/2010-January/282022.html
It always suprised me that hre BBC micro used the 6502 rather than the
6809. By the time the Beeb was designed, Acorn had made a 6809 processor
board for their System machines, so they must have had experience with
the chip. THe Beeb is nice, but a Beeb with a 6809 processor would have
been something else :-)
-tony
Hi! When I designed the N8VEM 6809 host processor it is loosely based on an
article I read for the BBC computer called "Dragon in the tube". I am not
very familiar with the UK microcomputers but apparently 6809 "coprocessors"
were fairly common peripherals on their Z80 and 6502 designs. I used a
similar concept for the N8VEM to allow its Z80 SBC to access the 6809 as a
"host processor" peripheral on the ECB.
One of the builders was able to get CUBIX running on the N8VEM 6809 host
processor using the Z80 as its "IO processor". However, I can see how the
implementation can get confusing because it is either a Z80 based system
with a 6809 coprocessor or a 6809 based system with a Z80 IO processor. In
reality it doesn't really matter but it's a matter of perspective.
The N8VEM 6809 CUBIX implementation allows the use of ECB peripherals like
IDE, video, floppy, serial, parallel, etc but it requires the Z80 to serve
all the IO based on 6809 commands. I added the 6809 IO mezzanine board
(power, ACIA, PTM, 2 VIAs, expansion bus) to give builders the option of
using the 6809 host processor as a stand alone computer or to add separate
IO to the N8VEM system when connected to the bus. The idea being to let the
6809 host processor interact with the outside world using its own IO and
only involve the Z80 when absolutely necessary.
The hardware seems to work OK but we'll see where the software goes. I
think with CUBIX the 6809 N8VEM system becomes a lot more practical. The IO
mezzanine fits on top of the 6809 host processor. You can see some photos
here. These are out of date but give a good idea. Recently I fitted an
improved serial cable and the nylon standoff hardware. Also the PTM seems
to be working and that's good.
http://n8vem-sbc.pbworks.com/browse/#view=ViewFolder¶m=m6809
I have many 6809 host processor and IO mezzanine PCBs so if anyone is
interested please let me know. This would be a great opportunity for anyone
who would like to do some 6809 hardware and software hacking.
I think the N8VEM 6809 host processor is the only system I am aware of other
than Dave's homebrew that is running CUBIX. There maybe some other homebrew
systems out there too I can't find them after some searching.
Thanks and have nice day!
Andrew Lynch
At 03:45 PM 4/17/2014, Kyle Owen wrote:
>I've been trying to get Colossal Cave Adventure (ADVENT.SV) running under
>OS/8 with no luck.
The ADVENT.SV versions are VERY sensitive to just about anything in the
environment.
Basically, it turns off interrupts and saves all memory. If you have
different devices all manner of badness will happen.
The current ADVENT release doesn't have that problem, and properly
handles files being moved about. I don't know how easy it is to get new
files onto your emulated disk, but you might want to have a look at
http://www.rickmurphy.net/adventure.html
There's a RK05 image on that page with the current code ready to go.
However, you can try running what's on the diagpack -
.R FRTS
*ADVENT.LD
*<hit escape>
-Rick
