On Sat, Dec 11, 2021 at 4:31 PM Ethan Dicks wrote:
> On Sat, Dec 11, 2021 at 1:21 PM Noel Chiappa via cctalk
> > https://www.ebay.com/sch/m.html?_ssn=jariadkin-0&_sop=10
> >
> > has a couple of PDP-8 boards for sale that at the moment are going _really_
> > cheap.
They went for $80-$100 each,
On Sun, Dec 12, 2021 at 4:27 PM Jonathan Haddox via cctalk
wrote:
> I'll be following your progress with interest, I just installed Coax into
> the walls of my computer playhouse so I can ARCNet with my S-100 system. I
> have an ARCNet packet sniffer that can be loaned out if you would find it
On Mon, Dec 13, 2021 at 3:09 PM Grant Taylor via cctalk
wrote:
> On 12/12/21 10:28 PM, Ethan Dicks via cctalk wrote:
> > I haven't used ARCnet since we used to use it for 4-player Doom
> > (especially since not everyone in the gaming group had Ethernet at
> > home yet
On Mon, Dec 13, 2021 at 5:06 PM Mike Katz via cctalk
wrote:
> For my kids and their friends I used to set up several (up to like 5)
> bare motherboards first with lantastic 2MB cards and then NE2000 10mB
> compatible cards and play Doom over IPX back in the 90's.
Yes. Thank you. IPX. That was
On Fri, Dec 17, 2021 at 10:13 AM Paul Koning via cctalk
wrote:
> > Has anyone tried 3D printing these?
>
> Interesting idea. A while ago someone posted a picture of what looks like a
> "go/no-go" gauge for DECtape reels. It is marked with the dimensions of the
> two sides: 2.504-2.505 inches f
On Sat, Jan 1, 2022 at 6:40 PM Chris Zach via cctalk
wrote:
> Regardless, I found a M857 board with a RS232 cable on it and BC01R-25
> on it. Was that for a pdp11/05 by chance?
I found this reference from the Cables Handbook. Sounds like it was a
generic cable that probably worked with several d
On Sun, Jan 2, 2022 at 11:31 PM Chris Zach via cctalk
wrote:
> Oh yes, the 730 is probably the neatest little "pocket Vax". Especially
> if you have the R80 drive as well as the RL02. The R80 did not use the
> Unibus, correct?
Correct. The R80 connects to the RB730 controller which has its own
s
On Mon, Jan 3, 2022 at 12:18 AM Warner Losh via cctalk
wrote:
> I had accounts on a MicroVAX 2 and a VAX 11/750. The microvax was faster
> for most compute jobs, but the 750 with 1/4 the memory handled more users
> mostly in text editors with the occasional compile or nroff/troff jobs.
> IIRC, the
On Mon, Jan 3, 2022 at 12:29 PM Bill Gunshannon via cctalk
wrote:
> On 1/3/22 11:50 AM, Ethan Dicks via cctalk wrote:
> > I'll agree with that. We used to run 40-50 users on our 8MB 11/750
> > (with both CMI and Unibus disk) but it did do some swapping over 8-10
> >
On Wed, Jan 12, 2022 at 12:16 PM Mike Katz via cctalk
wrote:
> I am looking for one or two 8" floppy drives, preferably Shugart
> compatible at a reasonable price.
>
> Does anyone have anything like this laying around, unused, in their
> basement, storage locker, garage, etc.
>
> I am looking to m
On Mon, Feb 7, 2022 at 8:32 PM William Sudbrink via cctalk
wrote:
> You may recall that, a few weeks ago, I requested parts help (shopping
> baskets) for the Retro Chip Tester Pro that I got for Christmas. Well,
> today's mail
> brought the last few parts and I have finished and tested it.
Cool
On Sat, Feb 19, 2022 at 4:40 PM Fritz Mueller via cctalk
wrote:
> > On Feb 19, 2022, at 12:11 PM, Fritz Mueller wrote:
> A few additional details, in case it is helpful:
>
> IIRC, the 11/34 doesn’t have SACK timeout implemented in the CPU cards (the
> /34A did add this, however.) So without an
On Tue, Feb 22, 2022 at 9:02 AM Antonio Carlini via cctalk
wrote:
> I never installed it this way myself, but MicroVMS on the MicroVAX II
> was distributed on RX50 floppies: lost of them.
I have 2-3 install kits for MicroVMS on RX50. I'm working on imaging
them. First attempts were not successf
On Tue, Feb 22, 2022 at 10:20 AM Antonio Carlini via cctalk
wrote:
> I imagine it was possible to hook up RX50s to a VAX-11/750 but I never
> saw one configured that way. Why not use tape :-)
We had an RUX50 on our 11/750 (I still have it). It's just another
MSCP controller, but since we had a U
On Tue, Feb 22, 2022 at 10:43 PM Jay Jaeger via cctalk
wrote:
> Writing a 360KB or RX50 diskette with a 1.2MB drive is a path to a lot
> of frustration. Not only do you have to double step the drive (software
> often takes care of that part), but the tracks written will be narrower
> than a real
On Tue, Feb 22, 2022 at 9:29 PM Rod Smallwood via cctalk
wrote:
> 2. The PC I want to use is a DEC Celeibris FX ie the PC and its W95
> software is as supplied by DEC.
.
.
.
> 5. putR was supposed to be able to do this. It does not.
Rod,
My memory is that programs like putr need to run on "real
On Fri, Mar 11, 2022 at 8:03 AM Tom Hunter via cctalk
wrote:
> As there is no real cctalk traffic other than test messages I thought I
> post something a bit more interesting. Here is a short video of my fully
> restored DEC H500 Computer Lab with an 8-bit counter implementation
> including reset:
On Sat, Apr 9, 2022 at 3:43 PM Chris Zach via cctalk
wrote:
> I'm thinking about going up to VCF in Wall next weekend.
22-24 Apr, as mentioned...
I should be there too.
> I haven't been
> to it since it was the Trenton Computer Fest (think late 1990's)
Totally unrelated event.
> so I'm
> not
On Mon, Apr 11, 2022 at 8:43 AM Chris Zach wrote:
> On 4/10/2022 6:05 PM, Ethan Dicks wrote:
> >> Ton of pdp8/12 IO cables. These are the black circular wire ones, I
> >> think negibus.
> >
> > There's definitely some discussion going on about those. They are
> > desired by 12-bit folks.
>
> *nod
I see it (and I observed the same thing - just rejoined after having
subscription problems stretching back to May, and didn't see any
traffic).
-ethan
On Fri, Sep 16, 2022 at 12:09 PM Kevin McQuiggin via cctalk
wrote:
>
> Pardon the test message, I have just re-subscribed to the list but have se
Greetings, all,
While getting ready for VCF Midwest etc, I have been spending a lot of
hobby time in the past year digging out various DEC minicomputer items
and testing/repairing them. To that end, I've been staring at a DSD480
on top of a PDP-8 rack. It's one of the ones with the DSD 26-pin
int
On Sun, Sep 18, 2022 at 2:30 AM jim stephens via cctalk
wrote:
> I'm getting ready to move to KC and my pile of DSD is back there.
Hi, Jim,
Cool.
> I have both PDP8 varieties and PDP11. One complete system from Sellam
> which hopefully contain data, etc. Dual booted for a friend he helped
>
On Tue, Oct 11, 2022 at 1:17 PM Vincent Slyngstad via cctalk
wrote:
> On 10/11/2022 10:08 AM, Tony Duell wrote:
> > On Tue, Oct 11, 2022 at 6:04 PM Vincent Slyngstad via cctalk
> > wrote:
> >
> >> Those are the ones. The 3D printed parts are essentially triangular
> >> blocks that mount to the r
On Tue, Oct 11, 2022 at 7:21 PM Vincent Slyngstad via cctalk
wrote:
> Bob Armstrong sent some pictures from Jack, which helped my find the
> photos I knew were online somewhere:
> https://forum.vcfed.org/index.php?threads/adding-a-programmers-console-to-a-pdp-8-a.75942/#post-921828
That's exactly
On Wed, Oct 12, 2022 at 11:36 AM Paul Koning wrote:
> > The clip nut is 10-32...
>
> That's the same clip nut used on H-960 racks. I saw some at the local
> hardware store recently. An unusually well stocked hardware store,
> admittedly, but clearly they are still current items.
It's the same
On Sun, Oct 30, 2022 at 2:49 PM Wayne S via cctalk
wrote:
> The difference between dz and dh interfaces is that the dh used dma instead
> of interrupts to get characters to the cpu. It would be transparent to any
> software.
> I did a write up on them 40 years ago justifying the replacement of a
On Tue, Nov 1, 2022 at 12:01 PM Paul Koning via cctalk
wrote:
> > On Oct 30, 2022, at 2:49 PM, Wayne S via cctalk
> > wrote:
> >
> > The difference between dz and dh interfaces is that the dh used dma instead
> > of interrupts to get characters to the cpu...
>
> No, it doesn't. I was confused
On Sat, Nov 12, 2022 at 12:18 PM Chuck Guzis via cctalk
wrote:
> On 11/12/22 02:28, Tony Duell via cctalk wrote:
> > ... This is the sort of
> > thing I'd do with a couple of transistors or an NE555 depending on
> > which turned up in the junk box first.
>
> One thing that a small MCU has over a 5
On Sat, Nov 12, 2022 at 8:23 PM Sellam Abraham via cctalk
wrote:
> I recommend the DEADBEEF dish.
FEED FACE DEAD BEEF
-ethan
On Tue, Dec 20, 2022 at 5:35 PM Bill Degnan via cctalk
wrote:
> We used to shun anything newer than and including the IBM PC but
> time.marches on. You're safe if you discuss systems produced before 1990.
> After that put an OT in the front of your subject so as not to offend the
> purists. Pers
On Sun, Jan 8, 2023 at 6:40 AM jos via cctalk wrote:
> On 08.01.23 01:51, jake utley via cctalk wrote:
> > Hello everyone I’m a young collector (18) of 60s and 70s minicomputers and
> > micros. I have been restoring a PDP-8L and would love to find ether a
> > Diablo series 30 or Dec RK03 removab
On Sun, Jan 8, 2023 at 1:50 PM Chris Zach via cctalk
wrote:
> That will be complex. I had an RK8 disk controller (the 6 foot cabinet
> that was it) along with a pair of the RK03 disk drives and it was (a)
> insane, (b) heavy beyond belief, and (c) finicky.
I think I've only ever seen pictures. I
On Sun, Jan 8, 2023 at 11:52 AM Liam Proven via cctalk
wrote:
> > Win95/Win98 would be happy with a PC/AT 286, with appropriate RAM
>
> Nope. 32-bit only. 386DX or later. I tried it and benchmarked it at
> the time of release. And it beat WfWg 3.11 by a significant margin, to
> everyone's amazemen
On Mon, Jan 23, 2023 at 6:09 PM Sellam Abraham via cctalk
wrote:
> I submit that the //gs isn't even really an Apple ][ properly.
> It's more like a quasi-Macintosh with really good (not perfect) built-in
> emulation of an Enhanced //e.
That totally makes sense. I never got into the //gs and t
On Wed, Mar 8, 2023 at 3:59 PM Bill Gunshannon via cctalk
wrote:
> I had some good sized iron in my home in the early 80's.
We (my family - I put up 1/3, my mother covered the other 2/3) got a
PET in 1979. I came home from my first Dayton Hamvention in 1982 with
a PDP-8.
If a high school kid ca
On Thu, Mar 9, 2023 at 5:05 PM Cameron Kaiser via cctalk
wrote:
> This has been around the block:
>
> You can lose a screw in a micro.
> You can lose a screwdriver in a mini.
> You can get lost in a mainframe.
We had an Amdahl in the middle of a multi-thousand-square-foot
computer room (one of se
On Sun, Apr 30, 2023 at 8:47 PM W2HX via cctalk wrote:
> Can anyone tell me what I picked up at a NH hamfest this weekend for $20? I
> see it says RL01/RL02. I have two RL02 drives and some platters. None of
> which I have gotten around to trying. Other than a copious amount of pine
> needles,
On Tue, May 16, 2023 at 4:05 PM Dennis Boone via cctalk
wrote:
> > At the most recent CoCoFEST!, I brought home the old Glenside Club
> > Computer Hard Drive. The mechanism is an ST-251...
<
> The best way to approach this, given the interchange issues with MFM
> disk controllers, is probably t
On Thu, Jun 1, 2023 at 4:45 PM Alexander Schreiber via cctalk
wrote:
> On Wed, May 31, 2023 at 05:01:34PM -0700, Fred Cisin via cctalk wrote:
> > What is the bandwidth of a station wagon full of 1TB Mcro-SD cards hurtling
> > down the highway?
>
> $BIGNUM.
I did see an actual 1970s station wagon
On Fri, Jun 2, 2023 at 4:38 PM Sellam Abraham via cctalk
wrote:
> On Fri, Jun 2, 2023 at 8:24 AM Ethan Dicks via cctalk
> wrote:
>
> > I did see an actual 1970s station wagon loaded with RL02 cartridges
> > once, pulled up at the dock of Baker Systems, the large Computer
&g
On Wed, Jun 14, 2023 at 12:21 PM Sellam Abraham via cctalk
wrote:
> Based on other videos of Dave's that I've watched he doesn't really know
> what he's talking about so I wouldn't lend much credence to his apocrypha
> either.
Agreed. Some months back, Dave put out one of his videos with a
click
On Fri, Jun 16, 2023 at 10:26 PM Tomasz Rola via cctalk
wrote:
> I guess we are all prisoners of our own mental frame. I recall that
> Ken Olsen (DEC founder), once quipped "There is no reason for any
> individual to have a computer in his home." - that was in 1977,
> according to wikiquote:
>
> h
On Sun, Jun 18, 2023 at 7:56 PM Cameron Kaiser via cctalk
wrote:
> > Just letting everyone know that Bob Applegate passed away a few days ago.
> > He had been battling cancer for some time. He was involved with vintage
> > computing for some time. Here is his website: http://www.corshamtech.com/
>
On Thu, Jul 6, 2023 at 6:26 PM Bill Degnan via cctalk
wrote:
> I am going throw out a Jim Butterfield too
I never got to meet him or correspond with him directly, but through
his articles and his work with TORPUG, he absolutely had a huge
indirect influence on my early years.
I did learn plenty
On Mon, Jul 17, 2023 at 12:28 PM Henry Bent via cctalk
wrote:
> I just noticed that images of a full RX50 floppy set for Ultrix-32m 1.2 was
> posted on Bitsavers (
> http://bitsavers.trailing-edge.com/bits/DEC/vax/ultrix/1.2/ULTRIX-32M_V1.2_RX50_1986.zip
> ). I am having difficulty parsing these
On Mon, Jul 17, 2023 at 12:48 PM Ethan Dicks wrote:
> From: http://www.chdickman.com/pdp11/pro380.txt
>
> "The RX50 floppy starts at track 1. Track 0 is logically placed after
> track 79. The sectors are interleaved 1, 3, 5, 7, 9, 0, 2, 4, 6, 8,
> 10. The track shift and interleave must be taken i
On Mon, Jul 17, 2023 at 12:48 PM Ethan Dicks wrote:
> On Mon, Jul 17, 2023 at 12:28 PM Henry Bent via cctalk
> > I'm almost thoroughly unfamiliar with IMD - is there some obvious
> > extraction/conversion option that I am missing here?
As mentioned previously, yes. There's an additional step tha
On Mon, Jul 17, 2023 at 1:05 PM Paul Koning via cctalk
wrote:
> > On Jul 17, 2023, at 12:51 PM, Ethan Dicks via cctalk
> > wrote:
> >
> > On Mon, Jul 17, 2023 at 12:48 PM Ethan Dicks wrote:
> >> From: http://www.chdickman.com/pdp11/pro380.txt
> >>
>
On Thu, Jul 27, 2023 at 11:28 AM Mattis Lind via cctalk
wrote:
> Perhaps it would be a good idea to upload de-interleaved images along with
> the .IMD, .DSK and a quick document that explains the situation. Otherwise
> we will have this coming up every now and then and people will scratch
> their
On Sat, Aug 5, 2023 at 4:08 PM Bill Degnan via cctalk
wrote:
> But...because the apple I is so valuable people have been motivated to
> produce really nice replica motherboards. The replicas give many the
> chance to experience the Apple I at a reasonable price
I have a bare replica PCB. It's p
On Sat, Aug 5, 2023 at 6:11 PM Cameron Kaiser via cctalk
wrote:
> I have an IMSAI as well, but for me my favourite computer of that era is the
> KIM-1, and that's such a simple design there are tons of implementations
I only recently got a KIM-1 (at VCF East). It's been on my list for a
while an
On Thu, Aug 17, 2023 at 2:34 PM Bill Degnan via cctalk
wrote:
> On Thu, Aug 17, 2023 at 2:28 PM Ethan Dicks via cctalk <
> I should add that part of the fun is to locate parts for free or cheap from
> dead or unimportant period electronics, cards, etc. In that way slowly
> buil
On Fri, Oct 20, 2023 at 12:11 PM Jon Elson via cctalk
wrote:
> On 10/20/23 03:59, Michael Thompson via cctalk wrote:
> > The RICM has an empty 11/20 chassis and the power supply. All it needs is
> > the processor backplanes. Is there any chance you have a set of backplanes
> > available?
> >
> I h
On Wed, Oct 18, 2023 at 10:21 AM Henry Bent via cctalk
wrote:
> Interesting. My Dilog DQ614 (ST506 emulating RL02s) specifically does not
> work with Ultrix, but does work with 2.xBSD and v7, so I would not
> necessarily assume that a third-party board was going to work with
> Ultrix-11's drivers
On Fri, Oct 20, 2023 at 1:46 PM Henry Bent wrote:
> I have a SIMH installation of Ultrix-11 3.1 on RL02 drives. Two RL02s is
> enough for a base system and four (which would be what the DQ614 provides, if
> it worked) would be more than enough for sources and work, etc.
Yes. 40MB should be pl
On Mon, Nov 27, 2023 at 5:32 PM Rick Bensene via cctalk
wrote:
> Steve Lewis wrote:
> > then like the 4004, we're struggling to find evidence of actual products
> > that
> > made use of them. Wasn't the 4004 used in some cash registers, street
> > lights, or
> > some weighing machines? (I don't
On Fri, Dec 22, 2023 at 10:20 PM Chuck Guzis via cctalk
wrote:
> Sync (Bisync, SDLC/HDLC) was fairly popular back in the day for linking
> with mainframes. (Think, for example, IBM HASP). On PCs and the like,
> the Intel 8251 was used a lot, but even the Signetics 2651 has the sync
> mode, with
On Fri, Mar 15, 2024 at 6:49 PM Charles Dickman via cctalk
wrote:
> Voyager 1 is in the news recently because of communications problems and
> possible solutions. Is there an online source for documentation on the
> Voyager systems, especially the computers and navigation systems?
>
> I have enjoy
On Mon, Apr 15, 2024 at 12:53 AM Christopher Zach via cctalk
wrote:
> Was reading the Wikipedia article on Drum memories:
>
> https://en.wikipedia.org/wiki/Drum_memory#External_links
>
> And came across this tidbit.
>
> As late as 1980, PDP-11/45 machines using magnetic core main memory
> and dr
On Wed, Apr 10, 2024 at 8:07 PM W2HX via cctalk wrote:
> 1. I have read that the card and the drives were compatible with the dec rx02
> drives. Why would the CRDS even bother to redesign a card where DEC had
> perfectly good working ones? Anyone know if there is any value in keeping the
> FC-2
On Mon, Apr 22, 2024 at 2:30 PM Paul Koning via cctalk
wrote:
> Anyway, I would think such a small microprocessor could emulate a PDP-11 just
> fine, and probably fast enough. The issue isn't so much the instruction set
> emulation but rather the electrical interface. That's what would be need
On Mon, Jun 17, 2024 at 1:53 PM Mike Katz via cctalk
wrote:
> I remember running this program at school in the mid 1970's.
>
> This runs on 4K Focal '69 without the extended functions enabled. So it
> should run on a 4K PDP-8/L.
>
> ...
>
> It was available as FOCAL8-81 from DECUS (Submitted 20-Ja
On Mon, Jun 17, 2024 at 4:13 PM John Robertson via cctalk
wrote:
> Fascinating - and there was a video game made by Atari called Lunar
> Lander which also tried to put a LEM safely on the surface.
I loved that version when it came out when I was a kid. Sad most of
them disappeared (and were conv
On Mon, Jul 1, 2024 at 7:58 AM Liam Proven via cctalk
wrote:
> ... vendors mostly
> refuse to ship internationally and buyers won't look at stuff that's
> abroad.
If you aren't used to customs declaration forms, it can be a pain.
Back in the 80s, I bought an Amiga accessory from a 2-man shop in
C
On Mon, Jul 1, 2024 at 8:28 PM ben via cctalk wrote:
> On 2024-07-01 6:04 p.m., Mike Stein via cctalk wrote:
> > Hey, I sent you a motherboard from Toronto all the way to the South
> > Pole, remember? Well, OK, via San Francisco, but It wasn't too bad
> > then.
Mike, I do remember. I still have
On Tue, Jul 16, 2024 at 1:04 PM cz via cctalk wrote:
> It uses the 3 volt Lithium cell found in later Apple devices. Should not
> leak or explode, replace it and move on.
>
> Needed to start up the NeXT.
Yes it is, and as I found out when I pulled out my NeXT cube for VCF 5
years ago, the default
On Mon, Jul 22, 2024 at 9:05 PM Igor via cctalk wrote:
> Me and my buddy are building an Apple I replica, for now successfully.
> Recently we have tested the video signal :) However, we are having big
> problems (as you can imagine) with finding Signetics 2519 chips. I know
> many ordered them in
On Thu, Jul 25, 2024 at 7:03 AM Christopher Zach via cctalk
wrote:
> I have always heard that Dec screwed with the smd spec. Maybe not?
>
> On July 25, 2024 12:41:57 PM GMT+02:00, Michael Thompson via cctalk
> wrote:
> >The CDC test system for the RM03 is a standard SMD device. You disconnect
On Mon, Aug 19, 2024 at 11:35 AM Paul Anderson via cctalk
wrote:
> I remember there being a hack to convert M920 from an 11 to a M935 for an 8.
I'd love to see that hack. I could have really used it in the 80s.
-ethan
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