> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Alexandre Souza -
> Listas
> Sent: Tuesday, April 13, 2010 12:50 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: New old products :)
>
> >> Next time, use kicad, diptrace or something useful. Eagle sux.
> > I'm not going to defend Eagle, but I'm unfamiliar with diptrace - what
> > makes it better?
>
> Ethan, it is a matter of using the tool, I could say wonders about
> diptrace, but I do believe nothing will be compared with you getting the
>
> tool and taking a look.
>
> > I use Eagle because it works on any computer I'm likely to be sitting
> > and and because there are lots of examples and user-contributed parts.
> > I'm not opposed to switching tools, but I'd rather not switch tools
> > just to spend all my time creating libraries for classic computer
> > components. If another tool has better libraries and is easier to
> > use, then I'm all for it.
>
> I use Altium Designer, but I admit it is too expensive for (legal)
> hobby
> use :o)
>
> I do believe in Diptrace. But KICAD is getting better and better
> everyday. More libraries and a very active development. Maybe you'll
> want to
> take a look at it :)
[AJL>]
Hi! I use KiCAD quite a bit and have designed several PCBs with it. It
works fine and is completely unrestricted. I think it is a fine product and
recommend it whole heartedly. It has improved dramatically over the last
couple years. Also, all of the N8VEM PCBs are posted on the wiki in the
KiCAD format.
Thanks and have a nice day!
Andrew Lynch
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Shawn Rutledge
> Sent: Monday, April 12, 2010 1:26 AM
> To: cctalk at classiccmp.org
> Subject: Xedex Baby Blue CPU Plus ISA card
>
> I just found one of these in my pile if anyone wants it.
[AJL>]
Hi! I just obtained one of these boards and would like to get some
documentation for it. Does anyone have documentation available they can
scan, mail, or post somewhere?
Any help much appreciated. Thanks and have a nice day!
Andrew Lynch
ard at p850ug1.demon.co.uk (Tony Duell) wrote:
>> Oh, that bad RK8E controller just confronts me with "Data break error" :-(
>
> IIRC a ;'data break' is a bit like DMA. I do haev the prints and some
> technical desription, so I could help you debug this sometime...
Just for reference: databreak is exactly just DMA. It's just another
name for it. The "fun" part of the PDP-8 is that you have 1-cycle data
break and 3-cycle data break devices... :-)
You never see the 3-cycle version on any modern DMA devices...
Johnny
Hey all -
Picked up a Burroughs C3360 calculator this week. It's a programmable
4-function+square root and 10-register memory with a nice 16-nixie
display. (See http://oldcalculatormuseum.com/bc3660.html)
I cleaned it out, and it's working fine in calculator mode, but in
programming mode the program step counter is usually (but not always)
stuck at zero. Sometimes it increments properly for a few seconds after
power-up. Seems like a fairly simple fault to trace down, if I had any
idea where to begin... anyone have a schematic for this thing (or the
Sharp Compet 363P, which this machine is a rebranded version of)?
Hopefully the fault isn't in one of the LSI chips in this thing, I'm
guessing those are going to be hard to find.
Thanks as always,
Josh
A friend of mine is selling a number of computer brochures and
sales leaflets from the 1960s and 1970s. Looks like they'd
be of interest to some collectors here. They're on eBay
as follows:
http://shop.ebay.co.uk/kate_elliott/m.html
--
John Honniball
coredump at gifford.co.uk
Hi
Does any have the original paper tape of MAINDEC-08-D5FA and/or a scan
of it's source listing?
It's an RF08 diagnostic for the PDP-8
The archived copies of the paper tape have a checksum error. I could
reconstruct it, but I'd rather
have a pdf of the source listing. I've looked and didn't find one anywhere.
I'd also like to see a scan of the source to MAINDEC-08-D5EB if anyone
has one.
-brad
-----------
Brad Parker
Heeltoe Consulting
http://www.heeltoe.com
781-483-3101
Hi folks,
here are some videos and pictures I took when operating an RK05f completely open with the exposed.
Hope you like it!
http://pdp8.hachti.de/?gallery/rk05f
And keep in mind: I did this for curiosity and the whole thing only lasted a few minutes. The disk
is back in the plastic shroud and nothing has been ruined. In fact the drive was still not 100%
perfectly adjusted while I shot the stuff on the page. In the clips the drive performs part of the
DEC maindec drive control test. I had a lot of trouble finding out the servo system's weakest
part.... Now I managed the drive to run reliable and to be able to retract the heads properly (seems
to be not so uncommon problem!).
Best wishes,
Philipp
--
http://www.hachti.de
List,
Just for the "FYI" file, Terak (UCSD Pascal) floppies appear to be
either SSSD 3740 format (FM 77 tracks * 26 sectors * 128 bytes) or
SSDD (Track 0, FM 26 sectors * 128 bytes, not used) 76 tracks * MFM
15 sectors * 512 bytes. The double-density format is definitely
standard MFM, not DEC RX02 (FM headers, "tweaked MFM data).
The MFM format is interleaved 2 to 1 with a one-sector skew per
cylinder.
The FM format is also interleaved 2 to 1 with a 6 sector skew per
cylinder.
For whatever it's worth,
Chuck
(P.S. I wouldn't mind owning a Terak, judging from some of the
program code I've seen).
I?ve gotten back into my Atari systems again and since I had a couple Indus
GT drives, I found a schematic for the RAM upgrade board for the drives, and
had PCB?s made :) my first professionally produced PCB?s in 20+ years. I?m
quite pleased since it was a first effort with new software when I hadn?t
touched EDA software in 20 years or so.
Lessons learned were:
Increase PAD size :) these are solderable, but are just a touch too small
by the software default.
Validate that pin one indicators REALLY render out to the gerbers. I have to
refer back to my PCB design for pin one since it didn?t render.
Quadruple check that all wires and nets are present. I discovered that a
trace between 2 pins on the connector(s) disappeared on me at some point
during editing, it is entirely possible I deleted it like an ID10T. So for
this run of boards, wire-wrap wire will be my friend to jumper the 2 pins at
the PCB.
Hi,
I already asked this in thesimh mailinglist, without replies, so maybe
this list is more appropriate to get a response.
I am working on a SIMH emulator for the Sage&Stride 68k machines
(Sage-II/IV). There is a lot of docs available at
sageandstride.org, which is the base for the development. One thing I
haven't found yet is a more recent boot ROM
than the available 1.2 version; docs mention 2.0 and 2.1. These versions
have, besides presumably a number of bug
fixes, support for the winchester disk card.
Does anyone have a rom dump (any format) of such a BIOS (16k)? I already
tried to contact David Erhart, the owner of the above
site, but twice didn't get any response.
Thanks in advance
Holger
P.S. The code is not yet ready to release (still some bugs in the FDC
part, some missing instructions, and the HDC support),
but I'll report in the simh developers list when it is.
