Hi!? I've been working on a home brew S-100 backplane as a side project for
a while now.? I posted an initial draft version a few weeks ago and have
made some improvements based on the comments.
Here is some updated information on the schematic and PCB layout.? Comments,
questions, suggestions are all welcome.? My plan is to make a small initial
run of manufactured PCBs and would like to know if anyone would be
interested.
What I am looking for is a small group of experienced S-100 builders who'd
like to purchase one of these boards (at cost, PCB only, plus shipping) to
help with building it and checking it out. I am trying to keep the costs low
but the PCB will be in the $30-$40 range depending on quantity.? Builders
would need to supply parts, power supply, tools, etc.? The intent is to
shake out the design with some early builds and get some feedback for
improvements as needed.
http://n8vem-sbc.pbwiki.com/browse/#view=ViewFolder¶m=ECB%20to%20S-100%2
0Bus%20Bridge
I designed the S-100 backplane for a small 7" x 7" backplane of 6 slots with
an integrated active terminator. ?The active terminator circuit is based on
one I bought in a home brew S-100 system and it resembles other active
terminators of the S-100 era.
If you are interested please contact me.
Thanks and have a nice day!
Andrew Lynch
On 17 Apr 2009, at 05:52, cctalk-request at classiccmp.org wrote:
>
> Message: 8
> Date: Thu, 16 Apr 2009 20:29:09 +0100
> From: Gordon JC Pearce <gordonjcp at gjcp.net>
> Subject: Getting OT - Microcontrollers, was Re: Remapping the HP150
> The PIC microcontroller is kind of designed to be easy to program
> in assembler to do simple control jobs. It's also about the only
> CPU I
> know of that's easier to program in assembler than C.
I find it easy to program my 'microcontroller' in machine code, though
mine weighs 5 tons. But it really is as basic as a microcontroller,
plus you program it in decimal unless you need to handle binary/hex/
octal data. It is not really possible to write a C compiler for it
anyway.
Anyone know what kind of interface a Conner CP-4021 uses, and if it's
something standard, what the pinout is?
This is a 20mb drive from an old Compaq LTE (8088) laptop. I'm trying
to recover some data from it, and the laptop itself is dead. It appears
to have a 44-pin connector in some form-factor I've not seen before.
This is split out into two ribbon cables that plug into the laptop's
motherboard. Can't find anything on the net. Found a site selling 'em
as "0.02gb" drives, though :). (This site claims it's an IDE, I'm not
so sure... though it would be nice.)
Thanks,
Josh
Hi people,
There are some T6600C available here (OHIO, US). If you want some, I can
pick up some for you. Your cost = shipping + 9.99(price) + tax(8.??%) + 4.99
(my gas and time). Let me know before Friday morning. Thank you!
vax9000
So I'm now the proud father of a DEC PDP 11/40, which should be a fun
project/adventure to get running again.
I have been testing out the power supply and everything looked good this
morning, at which point I figured I'd populate the CPU backplane and see
what would happen. The answer is: not much -- occasionally a few LEDs
would light up, but the machine was completely unresponsive.
I went a bit further and tested the voltages at the backplane, and while
checking the +15V, my probe slipped momentarily, bumping a nearby
wirewrap pin, causing a small spark. Now, where I once had +15V, I have
0V. And since the -15V regulator is powered (in part) from the +15V
line, that's dead too.
I was hoping, after reading through the documents again, that it would
be something as simple as fuse F1 on the power control board, but no
such luck. The fuse is still good.
Any suggestions for what's most likely to have blown when I screwed up
here? Any recommendations for working on this supply? I'm really
looking forward to pulling this thing out of the rack to work on it --
this thing looks heavy :)
Thanks,
Josh (still slapping himself for screwing this up...)
>>>
Thanks for providing the schematics, Jeff.
Where would I find them? Do I have to log into a web site?
(I'm not sure I could remember the password if the mailing list
has such a file repository.)
--Tim
> Date: Wed, 15 Apr 2009 18:03:32 -0700
> From: "Jeff Little (jeflittl)" <jeflittl at cisco.com>
> Subject: Intercept Jr. Schematics
> To: <bob at jfcl.com>, "Ethan Dicks" <ethan.dicks at gmail.com>, "Steve
> Stutman" <steve at radiorobots.com>, "Tony Eros" <teros at doelegal.com>
> Cc: cctech at classiccmp.org
> Message-ID:
> <B2900A9E966E5B49966F0F448614E6F4072A8C0C at xmb-sjc-221.amer.cisco.com>
> Content-Type: text/plain; charset="us-ascii"
>
> To All:
> Just in case anyone was interested, here are the schematics that I
> found
> for the Intercept Jr. and two of its accessory boards that were done
> about 1975 or 1976. Your's truly drew all three of these on the
> drawing
> board with pencil and straightedge. They were then turned into
> publishable versions by a graphic artist. The two boards plus a third
> one which had a number "devices" on it for lab demos made up the
> initial
> Intercept Jr. product set. This was used to support the original
> education classes that were based around this design.
>
> Still looking for listings of the micro-interpreter. This was the
> software that made use of the special keyboard and was embedded in the
> mask-programmed IM6312 ROM.
>
> You can see that the serial interface on the PIEART was arranged to
> support either an RS-232C interface or the old-fashioned 20ma current
> loop for communication with an ASR-33 Teletype.
>
> On the RAM module, the board held a set of two AA batteries to provide
> battery back-up on the RAM memory. It may be hard to believe but I do
> seem to remember that Intersil actually patented the little circuit in
> the upper right hand corner that prevented these batteries from being
> back-biased when the regular power was on and kicked them in
> gracefully
> when that power was lost.
>
> Regards,
> Jeff Little
>
>Subject: Re: Intercept Jr. Schematics
> From: "bfranchuk at jetnet.ab.ca" <bfranchuk at jetnet.ab.ca>
> Date: Thu, 16 Apr 2009 17:56:37 -0600
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Vincent Slyngstad wrote:
>> From: Ethan Dicks:
>> Sent: Thursday, April 16, 2009 3:20 PM
>>>
>>> On Thu, Apr 16, 2009 at 6:01 PM, bfranchuk wrote:
>>> > PS Did some other early computer have the ability
>>> > to run the 6100 cpu as well as 8 bit cpu's?
>>>
>>> Are you thinking of the CP/M board in a DECmate II?
>>
>> It might be what be what Ben was thinking of, but the DMII is actually
>> based on the 6120 CPU, not the 6100.
>
>No. I think I read about it in kilabuad, rather than a early BYTE.
>I think they supported a 8080, 6502 and 6100 as add on cards.
>Remember this was the time hardware tended to vanish overnight
>as well as your $$$.
The DECmateII was 6120 cpu (PDP-8A similar) and there was an Z80 based APU
that ran CP/M and there was also for the DMIII both Z80 APU and also
an 8088 based APU that ran CP/M-86 and DOS.
Since I have a few DMIIIs I know for sure about the Z80 APU and I've used the
DMII Z80 APU to run CP/M.
General the DMIII is a smaller form factor DMII with a few minor adds
and tweeks.
The 6120 is a 6100 with Integrated 6102 MEDIC (timer, DMA, EMA) and
some minor micro cycle tweaks and process improvements to make it a
bit faster. If you have a 6100 and 6102 it's 99.4% the same as 6120.
I have systems based on both. Generally wahn I want to play on raw iron
the PDP-8 (or 61xx) archecture satisfies me for shear simplicity.
The Digital Group system could have a 8080, Z80, 6502 and 6800 CPU but
didn't do the 12bit 6120. The 12bit width of 6100/6120 was odd to many
systems.
Allison
