When I reformed the 1967? capacitors in MARCH's straight 8 I took some
data showing the improvement in leakage and also measured capacitance and
ESR. I couldn't find original spec for the capacitor but the values
seemed reasonable compared to datasheet for more recent capacitors.
Graphs here.
I'm doing another run of boards.
The description of the board changes and the expected price are at:
http://www.pdp8online.com/mfm/board_revb.shtml
If you desire any please respond by email not to list with
1) How many bare boards you wish. I will assume production boards unless
you state
On Thu, Oct 15, 2015 at 12:02:26PM -0700, Brent Hilpert wrote:
> On 2015-Oct-14, at 3:40 PM, Robert Ferguson wrote:
> Eventually, we?d like to find or construct some solution for
> mass storage, but we?re still at the point of checking out the VT278 itself.
>
If you haven't seen them these may
On Tue, Oct 13, 2015 at 08:32:49PM -0400, Michael Thompson wrote:
> > What exactly do you mean by 'glitches'? Are these on a TTL level signal,
> > an analogue
> > output of the read amplifer, or what?
> >
>
> You can see the logic analyzer trace of many of the TC12 signals here.
>
On Fri, Oct 16, 2015 at 09:40:37PM -0700, Brent Hilpert wrote:
>
> Pressing 2 & 3 do something, 2 causes the system to go away - presumably
> looking for the disks; 3 causes a flashing cursor/underbar across the
> screen - presumably the 'print screen' scan,
> other operations don't work.
>
I
On Sat, Sep 05, 2015 at 08:46:44AM -0700, Al Kossow wrote:
> On 9/5/15 8:40 AM, william degnan wrote:
> >I surprisingly found little
> >commentary or threads about the TU10 / TM11, other than DEC docs. I guess
> >these are not super common
>
> They were common. I worked on a bunch of them.
On Wed, Dec 02, 2015 at 12:31:42PM -0600, Paul Anderson wrote:
>
> Any one have ideas for a TU10 or other tape drive capstans?
>
I went with http://www.terrysrubberrollers.com/. Since the TU10 just wraps the
tape around the capstan it needs to be pretty high friction. The material
used was a
On Fri, May 06, 2016 at 09:47:47AM +0200, Anders Sandahl wrote:
> Hi,
>
> I tried to run the diskless controller test on my PDP8/A. It fails before
> any tests has been executed. I suspect that my RL8A controller is broken.
> The CPU tests and the memory tests works fine.
>
> The test stopped @
On Fri, Jun 10, 2016 at 08:08:41PM -0700, Al Kossow wrote:
>
> I'm working on post-processing
> 2241092-0001_Business-Pro_Professional_Computer_Hardware_Technical_Reference_Apr86
> right now..
>
Is this the later 286 model? Mine is the 8088.
On Fri, Jun 03, 2016 at 10:02:22PM -0400, David Gesswein wrote:
> Do you have a KP8E power fail installed?
>
With a little more thought overnight it makes more sense. I suspect you
are using the extended option board with the KK8E. That board has the power
fail logic. Check the AC Low
On Sat, May 28, 2016 at 10:42:29PM +0200, Martin Peters wrote:
> I wanted to reactivate a TI Professional Computer (TIPC) and all I get
> some seconds after powering it on is the message
>
> "** system error ** 0004"
>
> and a beep, lasting for about 2 seconds.
>
> The TIPC is an early, not
On Sun, Jan 29, 2017 at 10:27:49PM -0600, Jon Elson wrote:
> >
> I think we had an Odec chain printer that another group gave us to
> use on our VAX. I hacked it up to shut off the chain motor when it
> wasn't printing, and then restart it when print data came in.
>
Mine has a switch to select
On Sat, Jan 28, 2017 at 03:51:49PM +0100, Mattis Lind wrote:
> I am about to get our IBM1627 (rebranded Calcomp 565) going but the pens in
> the case is quite dry. What is the best method to refurbish those? What is
> the best solvent to get the old ink out? What ink to refill with?
>
>
On Fri, Jan 20, 2017 at 02:00:55PM +0100, Mattis Lind wrote:
> Finally I managed to scan it correctly.
>
> It is the MP00075 which does not seem to be online.
>
> https://drive.google.com/open?id=0B-rp4vyPPYu1VjF1ZXJpSVBTZ1JBelFYMjRDR2VtYVRfSWw0
>
Thanks. Now have my ODEC/Data 100 model 1422
On Thu, Jan 05, 2017 at 10:38:41PM +0100, Mattis Lind wrote:
>
> OK. I'll bring it home and will scan it sometime next week.
>
> /Mattis
>
Did you get time to scan it yet?
On Mon, Oct 17, 2016 at 01:38:19PM -0700, Guy Sotomayor Jr wrote:
>
> Yes, that?s me but I have had issues with the emulator starting up
> reliably so that the 3174 boots.
>
I haven't had any recent reports of this problem. If you wish assistance
with it let me know.
On Mon, Oct 17, 2016 at 02:32:31PM -0400, Mike Stein wrote:
> No experience myself, but FWIW several Cromemco owners have used David's
> unit successfully with Cromemco's non-standard whole-track-at-a-time
> controller and have said good things about his willingness to work
> with non-standard
On Thu, Nov 17, 2016 at 03:33:36PM -0700, Eric Smith wrote:
> I'm not looking forward to trying to reverse-engineer 48-bit and 56-bit ECC
> polynomials. However, they usually tried to choose polynomials with
> relatively few terms, to minimize the number of XOR gates needed in the
> hardware.
>
I would also be interested in schematics. I have just started looking at this
board to try to use it with a ODEC/Data 100 chain printer.
> Looking at the LA180 manual's description of the LC8-P interface, it
> is pretty close to Centronics. I expect it is more than just a cable,
> though, because
On Fri, Dec 30, 2016 at 11:08:43PM -0500, Charles Dickman wrote:
>
> I am curious if the EAE is used with F4. The Language Manual says it
> is, but it is only mentioned in one place. There is nothing else to
> select using it or not using it. I looked at the sources for various
> parts of F4 and
On Thu, Apr 20, 2017 at 07:37:43PM +0200, Philipp Hachtmann wrote:
> I know the following configs:
>
> Outer shell (always same), narrow inlay, narrow top cap --> for the
> pen you pictured,
>
> Outer shell, wide inlay, wide top cap --> For the Fisher pen
>
> Outer shell, some other inlay, ink
On Mon, Jun 05, 2017 at 07:35:13PM -0400, Ray Arachelian wrote:
> Very true, I was one of those kids back then. :-D Though to my eye, I
> don't see the PCB pads worn at all, so more than likely it's the rubber.
>
If you haven't seen it there is stuff to repair that. I have used this on
remotes
Can anyone identify these boards? Person I got them from can't remember
anything about them.
http://www.pdp8online.com/ftp/misc/unknown_boards/
Date codes of 1964. Size 4.5"x3.25". Looks like used card edge for
keying but has separate 23 pin connector for electrical connection.
No useful
Someone in Barnet, North London, post code is EN5 1RJ has two DEC DS-32
drives and IBM Series/1 computer and some drives.
Last wording was Sale or swap.
You may contact them at st...@pdp8online.com.
Anybody on the list get these tapes?
https://www.ebay.com/itm/Decus-8-250-Fast-Fourier-Transform-FFT-Software-on-Paper-Tape-for-PDP-8-/192646534861?hash=item2cdaa0d6cd%3Ag%3A4ukAAOSwjexbjeWx=true=pZk7jy9IX%252F2eOztzfa26ClklLrI%253D_cvip=true=true=nc&_trksid=p2047675.l2557
I missed seeing that
On Thu, Jan 10, 2019 at 11:13:00AM -0800, Fritz Mueller wrote:
>
> > On Jan 10, 2019, at 12:47 AM, Christian Corti via cctalk
> > wrote:
> >
> > I don't think it's the platter but perhaps a dirty hub ring or centering
> > cone. Try cleaning the ring and the cone of your disk pack.
>
> Ah,
I have made a SA1000 adapter board for my MFM reader emulator. I did a
small run which seems to work so if you are interested email me to get
in on the next order. Prices may get a little better if I get enough
orders.
http://www.pdp8online.com/mfm/
On Tue, May 28, 2019 at 09:21:43PM -0700, Marc Howard wrote:
> Hi,
>
> I fired up the 8/A tonight and the TU56's are failing diags. I want to
> format a tape for scratch use but I can't find the MAINDEC that does this
> (along with flipping up the backplane switch.
>
> Can someone refresh me on
On Mon, Nov 11, 2019 at 12:27:29AM -0600, Eric Moore wrote:
> Hello, I have a working AED WINC08 drive, which is a winchester drive
> emulated to look like an RL02, along with the qbus controller card.
>
> https://archive.org/details/bitsavers_aedbrochurJan82_2107642/page/n1
>
> The winchester
Has anyone found a good method for repairing the DEC flat cables?
The ones with flat wires with plastic laminated to each side. The glue
holding the plastic on fails and you end up with two sheets of plastic and
loose wires.
I had some success with contact cement but it only glues the plastic
On Wed, Apr 08, 2020 at 03:34:18PM -0400, Bill Degnan wrote:
> Hi,
> . FRTS
>
> ..dumps me to the * prompt ...
>
> *RKB0:ADVENT.LD [return]
> * [esc]
>
> rather than loading ADVENTURE I get the following result:
>
> D.F. TOO BIG INIT
> MAIN 1740
> .
>
You need to specify the
On Sun, May 10, 2020 at 07:29:53PM -, Stephen Buck wrote:
> Looking for a pair of DEC RL02 drives, working or otherwise, for a PDP-11
> restoration destined for a local computer museum in Boulder, Colorado. It's
> fine if it's not working - I'm happy to try and get it up and running. Thanks!
I and others were having some problems with our floppy drives. Since I couldn't
find a diagnostic program for the Ohio Scientific I wrote one.
http://www.pdp8online.com/osi/osi-floppy-test.shtml
With some floppy testing info here
http://www.pdp8online.com/osi/floppy-repair.shtml
If you try it
Until they are up on bitsavers you can get them from here.
http://www.pdp8online.com/misc/TMS320_TMS340.zip
On Sun, Mar 08, 2020 at 01:04:41PM -0400, emanuel stiebler wrote:
> On 2020-03-07 14:38, David Gesswein via cctalk wrote:
>
> > I found around 70 disks for the TMS320C30 and
My previous employer likely still has the the in circuit emulator for the
TMS32010 unless they cleaned up. If the CHM is intereted in it I can
enquire if they would like to donate it.
I know I have some of the stuff since previous work used them as fast
microcontrollers. Should have the data
On Sat, Mar 07, 2020 at 02:45:28PM -0500, Toby Thain wrote:
>
> Curious what kind of tools that comprises and for what platform? The
> 340x0 was used in Truevision NuVista video cards and for a long time I
> was looking for the Mac (MPW I think) cross-development tools.
>
They were DOS tools.
On Mon, Sep 14, 2020 at 03:35:50PM +0200, Michael Engel wrote:
>
> Before I start to disassemble and test the machines, I would be interested
> to hear about specific problems you might have experienced bringing up one
> of these two machines, preferably those on the unexpected side.
>
I
On Mon, Jul 20, 2020 at 05:12:10PM -0400, Chris Zach wrote:
> Working on it. Question: Was the 67mb drive in a 7300/3B1 a miniscribe 6085?
>
Yes it was. http://www.pdp8online.com/3b1/drive.shtml
On Mon, Jul 20, 2020 at 11:58:01AM -0700, Ian Finder wrote:
> I may be able to track down floppies for 7300 TCP, if we can confirm it is
> extinct in the wild...
>
It may exist but is wounded.
https://archives.loomcom.com/retrocomputing/UnixPC/Install/standardized/ethernet/
All the 10S disks
On Mon, Jul 13, 2020 at 06:12:34PM -0400, Chris Zach wrote:
> Anyone know the best way to get files off an AT 7300/3B1 computer? This
> one has a lot of Perq stuff in a directory as well as hilarious things you
> can do with RP06 disk platters (ah, when we were young...)
>
You may have finished
On Sat, Dec 12, 2020 at 10:00:43PM -0500, Chris Zach wrote:
>
> I'm going to have to get that GSC thing out as well if I am going to reach
> these.
>
Looks like a rebadged HP 1000 series machine.
On Sat, Jan 09, 2021 at 01:06:19PM -0700, Warner Losh wrote:
>
> DEC standard 144 of any help?
> http://bitsavers.org/pdf/dec/standards/EL-00144_B_DEC_STD_144_Disk_Standard_for_Recording_and_Handling_Bad_Sectors_Nov76.pdf
>
> Warner
>
Thanks for looking.
That standard is only capable of
To possibly be clearer the image of the disk was a raw dump of the disk
taken with the mfm emulator/reader board so it sees all the extra data the
controller puts on the disk and the bad sectors etc. As far as I know no
documentation exists of the low level format and revector table etc. For
This is my info on RD53 sticking heads. Your symtoms match what I have seen
with this drive.
If the heads are stuck to the rubber bumper the drive will spin back down
when it finds the heads won't move. It will also spin down if it can't
switch from the coarse speed control loop to using the head
On Sat, Jan 02, 2021 at 09:29:16AM -0500, Chris Zach wrote:
> Meantime, anyone know how to convert one of Dave G's disk images on the MFM
> formatter to a format that can be read by SIMH? I have been working a lot
> with this thing, and would like to see if any of the data is really there.
>
The
On Wed, Feb 03, 2021 at 10:43:48AM +0100, Enrico email.it wrote:
>
>
> A very dear friend first read in raw mode a 10MB Winchester hard disk model
> Shugard SA1004 from which the files were correctly extracted and then set up
> a test bench from which you can see in this video the complete
I'm having trouble using DECtapes with TSS/8 under SIMH. I tried with both the
RF image and LCM RK05 image and no mater what I do it hangs if I try to
access a DECtape.
I am trying to use COPY command from account 2.
I attach a dectape in simh then assign it in TSS and then try to get a
On Tue, Sep 21, 2021 at 12:15:12PM -0400, Paul Koning wrote:
> > On Sep 21, 2021, at 12:00 PM, Jonathan Stone via cctalk
> > wrote:
> >
> > The RD53s in both Microvax 2000s are dead. I'm reluctant to buy more 30+
> > year old rotating media.
> > If I'm going to buy a disk emulator, I'd much
On Fri, Nov 05, 2021 at 10:13:48PM -0500, David Williams wrote:
> I have a TI monitor that has a power cord that is becoming sticky and gummy
> and I'm looking at what to do with it.
> Any other suggestions on dealing with the cord besides replacing it?
>
Once the plastic starts breaking down I
On Wed, Nov 03, 2021 at 10:57:21AM -0500, Jay Jaeger wrote:
>
> I have some LINCTape images with diagnostics. Let me know if you need one
> and I can send you the image.
>
I can add them to my browsble archive if you wish.
http://www.pdp8online.com/images/index.shtml
On Tue, Nov 02, 2021 at 07:53:42PM -0700, Vincent Slyngstad wrote:
> On 11/2/2021 2:25 PM, Jay Jaeger via cctalk wrote:
> > Here is a program I wrote for reading/writing tape images via XModem
> > protocol for my PDP-12, and another for comparing two linctapes.
>
> Cool! I was able to recover
On Fri, Nov 05, 2021 at 10:55:38AM +0100, Christian Corti wrote:
> On Thu, 4 Nov 2021, David Gesswein wrote:
> > On Wed, Nov 03, 2021 at 10:57:21AM -0500, Jay Jaeger wrote:
> > >
> > > I have some LINCTape images with diagnostics. Let me know if you need one
> &g
On Fri, Nov 05, 2021 at 10:07:33AM -0400, Chris Zach wrote:
> Speaking of which I have a couple of boxes of Linctapes from a pdp12 system
> that was used in a college. Is there any value in getting the data off them?
>
If you know they are all CS101 projects then may not be worth the time
but I
On Tue, Nov 02, 2021 at 03:12:05PM +0100, Christian Corti wrote:
> On Tue, 2 Nov 2021, Vincent Slyngstad wrote:
> > Another option would be to spin the data onto LINCtape with a TD8E, then
> > mount the result on the PDP-12. I think Dave is creating the images in
> > the first place with either a
On Sun, Jan 23, 2022 at 03:09:53PM -0800, Gary Oliver wrote:
> Taking the bits of tape, I exposed them to various concentrations of
> isopropanol/water (from about 25% to 99% iso) and found than in all cases,
> some of the data side of the tape came off on the wipe.? The remaining tape
> fragment
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