... If you pull the front bezel you can see the switches. The normal problem is ... Ahh, very nice work. The Straight-8 is a most impressive beast. I presumeMessage 1 of 91 , May 21View SourceOn Mon, May 20, 2013 at 8:19 PM, David Gesswein <djg@...> wrote:If you pull the front bezel you can see the switches. The normal problem is the
little plastic nubs are broken. You can repair that. 8/E switches are similar.
http://www.pdp8online.com/straight8/front_panel_restore.shtmlAhh, very nice work. The "Straight-8" is a most impressive beast. I presume you just drilled the broken side and didn't go all of the way through, correct? I just got through drilling my three broken switches this morning and opted to only go halfway, with the thought that I'll be much more gentle with these switches than the previous operators were back in the day. I have to track down some wire now to make the pins with.
are harder. I have a few
reproduction handles left. They will not match your colors properly so any
switch handle you can fix your better of with that. If you have some that
are hopeless email me direct and we can discuss. Some people have painted
handles to match better.Were the reproduction handles still injection molded? I may see about getting a mold made at some point. Tracking down the right color plastic may be tricky, but I'll see what I can work on. It'd be awesome to have authentic reproductions.
microcontroller to convert the parallel data from the controller to serial
for your 4047. The DEC ones aren't common and tend to be expensive when
they show up.Excellent, I can definitely make that a project down the road. I'm also designing a cheap, parallel paper tape reader based on the OAE design back in the day. My design will use photodiodes and either discrete transistor amplifiers or op amp arrays to attempt to cut down on cost.
the DEC and DSD used controller boards in the drive unit and a funny serial
interface from the controller in the PDP-8 to the controller in the drive.
The DEC drives show up reasonably often. The controller doesn't show up that
often.I have two controllers for PDP-11 8" floppy drives. Maybe somewhere down the road I can trade those away, assuming they aren't worthless compared to a PDP-8 controller.
... OS/8 needs a random-access storage device; paper tape won t do it. Magnetic tape drives are *physically* sequential-access, of course, but the TU56 (forMessage 91 of 91 , Jun 6View SourceOn 06/06/2013 12:54 PM, Kyle Owen wrote:
> That looks like a nice product, but yes, it's certainly expensive. I've gotOS/8 needs a random-access storage device; paper tape won't do it.
> some FPGA background myself, along with several different microcontrollers,
> so I may see about creating something that will work with my high-speed paper
> tape interface. That could be considered an OS/8 storage device, yes?
Magnetic tape drives are *physically* sequential-access, of course, but the
TU56 (for example) is logically a random-access, block-oriented device. (with
highly variable latency ;))
> I wouldIf this was a generally-directed question...The book you want for "most
> have no idea how to go about writing a driver for it yet, but perhaps it'd be
> in my best interest to start reading up on the commands for the card and then
> learn more about OS/8. Do you have any suggestions on recommended reading for
things OS/8" is the "OS/8 Handbook". It is excellent. Try to find a paper
copy if you can, but it's available in PDF on bitsavers:
Dave McGuire, AK4HZ
New Kensington, PA