I forgot to mention a Radio shack/ tandy model 4 and color 2, TI 99/4A
in box, piles of old hard and floppy drives, motorola 68K multibus?
520/1040 3 atari ST parts machines...
Thanks,
Jim.
Does anyone have a spare 16-bit SCSI PC C ard (PCMCIA) adapter and dongle they would be willing to part with? I have an Adaptec 1460D card, but it has an 8-bit SCSI data path, and I need a card with a 16-bit data path to use with an old Nikon slide scanner that I have. Please reply directly to me at feldman.r at comcast.net .
Thanks, Bob
I have some back-burner projects that will one day need me to start burning
EPROMs and EEPROMs. I can't justify the cost of the big professional things
costing hundreds of pounds. At the moment I know I will need to program a
27C1024 EPROM (40 pin DIP) and a 28C256 EEPROM (28 pin DIP), but it would be
nice to have something that can handle a reasonable variety of devices.
I believe the Willem programmer may be suitable, it is certainly affordable,
would that fit the bill? It seems to come from Thailand, although there seem
to be all sorts of sources on ebay, so I am not sure what the genuine source
really is.
I am also not averse to buying secondhand, ebay or otherwise, if I can get
something that is going to be more generally useful than the Willem.
Any advice welcome.
Thanks
Rob
Tim wrote:
> In the late 60's and 70's, radio shack sold some little
one-bit-flip-flop boards
> with lamps. Each flip flop was a little square of circuit board.
>
> There may have been other logic functions available one-to-a-board.
I'm
> pretty sure they were discrete transistors for the most part (even the
round
> package SSI Motorola RTL typically had two gates or flip flops per
package.)
>
> You could buy multiples and configure them as a counter, and I'm
pretty sure
> they could be wired as a shift register too.
>
> May have been "Archerkit" brand name. Or "Pbox" brand name although
> what I remember were not Pbox's but circuit boards.
>
> I tried using websearches to find pictures or docs, but the Googles,
they do
> nothing!
>
I built something like this when I was probably something like 12 or 13
years old. I was purchased at Radio Shack as a kit. It was a four bit
binary counter, with incandescent lights as on the Q outputs, (though
discrete transistor drivers), and a photoresistive cell or pushbutton
switch as the trigger. With the photoresistor as the trigger, when you
waved your hand in front of the photocell, it would increment the
counter, which was pretty cool.
I distinctly remember the RTL IC's made by Motorola in the black plastic
"blob" packages. I have vague recollection of the project being a
mother board that had four small circuit boards that had the flip flop
chip, transistor driver, and lamp (perhaps these were the boards that
Tim mentioned). The mother board had a photocell, a toggle switch, and
a momentary action switch with de-bouncing circuitry. You could trigger
the counter with the photocell, or the momentary action switch. I
think the thing ran off a 9V battery if I remember correctly. The
photocell didn't have very fast response time, but I do remember putting
it in front of a fan in a dark room with a flashlight shining through
the fan blades, and made the counter go pretty fast.
I think that I eventually damaged the chips by trying to make the thing
count BCD rather than binary by adding some gating. That was the end
of it.
It was fun building and tinkering with, and educational. It was my
first exposure to integrated circuits.
Hi,
I have some cards here I want to build a PDP11 from, at the current
that's something around an KDF11-A CPU (22bit).
Currently I have problems with some Dilog Controller, this is an DQ614
that emulates 4 RL02 Drivers out of two 20MB MFM disks (Microcience HH725).
I can install and successfully boot RT11SB.SYS and RT11FB.SYS but not
RT11XM oder RT11XB. XXDP2.5 is working fine.
Nowhere in the Dilog Documentation is something mentioned about 18 or 16
bit addressing limitations of that controller, the pinout clearly has 22
bits.
(http://www.bitsavers.org/pdf/dilog/)
I have an RQDX3 with 2 TEAC FD55-GFR-184 Floppies on this system too, I
can boot RT11XM oder RT11XB (same files!) from there fine...
If I try that from DL0 or DL1 I'll always get a trap to the ODT (0002),
regardless if I use the Dilogs own Bootloader or that from an 11/53 or an
11/73 CPU.
Does someone here know of that problem?
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
> Message: 9
> Date: Wed, 9 May 2012 01:08:08 -0400
> From: Ethan Dicks <ethan.dicks at gmail.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Subject: Re: More photos from VCF East 8
> Message-ID:
> <CAALmimkv-r06X-W2GAB9VS1_NLpiDB-kACijtzOB3JS7tC6NYQ at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Tue, May 8, 2012 at 11:27 PM, B Degnan <billdeg at degnanco.com> wrote:
> > More photos from VCF East 8
> > http://vintagecomputer.net/browse_thread.cfm?id=466
>
> You wrote:
>
> "Mike Ross' exhibit consisted of a PDP 11/05 used to interface with
> a PDP 15, in two racks. He demonstrated restoration techniques for
> attendees. I am not sure exactly what you call this console, there is
> no "PDP 15" on the panel, but I assume it's some kind of I/O device
> that complements the (not pictured) PDP 11/05 used to presumably
> bootstrap this thing."
>
> That _is_ the PDP-15 front panel - if you look, there are 18 data bits.
> The PDP-15 CPU was the large spread of M-series cards on the
> backplane above this front panel. Its memory was in a black box below
> (and not there for much of the weekend). The PDP-11/05 is self-contained
> and does the same job as the PDP-11/03 in a VAX-11/780 or the PDP-11
> in various models of PDP-10. In each case, the PDP-11 boots from its
> own ROMs to start up enough code to feed the larger processor. In the
> case of the VAX-11/780, the PDP-11/03 has one RX01 floppy drive. I
> don't know what this PDP-11 uses, but there must be some local mass
> storage that's part of the scheme.
Yes and no. On a pdp-15, the 11/05 is more a front-end than a console/bootstrap processor; it doesn't need to load microcode or any such thing. Any pdp-15 can start up from paper tape (there's usually a reader/punch immediately above the -15 console, was not installed at VCF) - heck, there's even a dedicated 'Read-in' switch on the console which initiates that boot. On the -15 I exhibited, the mass storage *did* rely on the -11; an RK11 talked to two RK05s (also not taken to VCF to make system easier to handle), and a Unichannel 15-to-Unibus interface gives the -15 direct access to the RK subsystem in 18-bit mode.
On my other pdp-15, mass storage is all native; it has an RP15 (disk) and TC59 (tape) controller. That system had an 11/40 front-end, but it was only used for communications devices. It's a much bigger restoration project as I only got hold of it after it had been deinstalled; quite a few cables cut, and every single -11 compatible component (the 11/40, power supplies etc) had been robbed by the site engineer for spares.
> Many I/O devices of the day did have blinkenlights indicators (usually installed
> at the top of the rack), but not this many control switches.
The RP15, TC59, and FP15 all have a good crop of blinkenlights. What I really want to get hold of is a TC15 DECtape control!
> Message: 26
> Date: Wed, 9 May 2012 06:10:39 -0700 (PDT)
> From: Gene Buckle <geneb at deltasoft.com>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Subject: Re: VCF East pictures
> Message-ID:
> <alpine.LFD.2.00.1205090608490.11705 at grumble.deltasoft.com>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> On Tue, 8 May 2012, Mike Loewen wrote:
>
> >
> > http://sturgeon.css.psu.edu/~mloewen/Oldtech/VCF-East2012/
>
> That PDP-15 console is just a thing of beauty. *sighs*
Would it be bad form to admit at this point that I have two of them? :-D
Mike
> Those new fangled IC's just aren't reliable. I only needed to repair
> 14 processor board plus one power supply board in my straight 8.
> Do you have any idea why so many? I didn't have to repair that many
> in my 8/I though didn't record the actual count.
The system sat in an uncontrolled environment for many years. There
was lots of corrosion on the boards. Some of the leads on the ICs were
so rusted that you could pry them off the board. We replaced LOTS of
7474 and 7400 ICs, and quite a few 7410, 7420, and 7440 ICs. There
were all kinds of interesting failure modes.
> The only OS I know that will run in 4k is disk monitor system (it does
> run on dectape only systems despite the name).
I saw that, read the manual, and couldn't believe that a disk
operating system would run with just a DECtape.
> The paper tape images needed to build it are here.
> http://www.pdp8online.com/ftp/software/paper_tapes/
Got them now.
> See in the readme DEC_D8* files. Start with SBAF then use the load
> and save command for the other programs as desired. ?I tested with an
> emulator that the DF32 PIP works with DECtape.
We will give it a try if we successfully format a tape.
> I recently built it for my DF32 so if you need more help I can provide. I
> can build a DECtape using an emulator and my PDP-8 but I can't test it
> since I don't have a TD controller.
The TC01 controller doesn't have any ICs, so it just worked.
Thanks for the help.
--
Michael Thompson
>> VCF-East is this weekend, and it's shaping up to be QUITE an event!
>> Who's going?
>
> I'm going *and* exhibiting ! It will be the best VCF ever ! There will be
> all those great lecturers, workshops, exhibits, etc ! And I get to learn how
> to troubleshoot and repair my C64 ! Super great weekend ahead !
Grumble, grumble, snarl . . . get off of my lawn!
; )
Best,
David Greelish, Computer Historian
President, Atlanta Historical Computing Society
- Author, "The Complete Historically Brewed"
- "Classic Computing Show" podcast
- "Stan Veit's History of the Personal Computer" audiobook podcast
- "Retro Computing Roundtable" podcast
- "Not Another Apple Podcast"
ClassicComputing.com | atlhcs.org
