Re: [midatlanticretro] Acquired a PDP-8/E
- On Wed, May 22, 2013 at 11:37:34AM -0500, Kyle Owen wrote:
>I used needle nose pliers to spread the tabs to get them in/out. After
> What's the preferred way to remove and replace the handles? I found the
> replacement part to be very challenging, particularly when there are
> handles to either side.
I put the new handle in I frequently had to bend them back since they
stayed spread too much. It was a pain.
> Since my system is mostly operational, save most of the bulbs, I think I'mhttp://www.pdp8online.com/pdp8cgi/query_docs/view.pl?id=188
> ready to test it out with some real code. I don't really know what I'm
> doing yet with the machine language. Where's a simple program that I can
> load that makes the accumulator shift left and right, or maybe just
> increment? I also need to study up on what the rotary switch settings do.
The first are simple instruction tests. The console print test and echo
test are good for checking out your console serial port. The visisble
increment AC test is what it says. The shifting lights will be a good first
program for learning the PDP-8 instruction set.
After I get the toggle in and console working then I toggle in RIM, load
over the console serial BIN, then run the 8/E maindecs, then run focal/basic
etc. To load basic or focal programs (not the bin tape) over the console
you will need to either convert reader run to RS-232 flow control or use a
program that can put pauses at end of line etc.
> Is the rotary switch supposed to turn 360 degrees, or are the stops broken?Yes it doesn't have stops. Later panels went to normal rotary switches.
> I like the fact that it's magnetic reed switch-based than normal silvered
> contacts. Fancy!
> Where can I find the pinout information regarding the serial interface cardFor the serial cable & board see
> for RS-232 operation?
Looks like I bought TE Connectivity to make the PDP-8 end
The housing has a polarizing bump which you don't want. It looks like I
cut it off. It does have the proper width to fit the housing. I bought that
back in 2009 so I don't remember why I bought with bump. The earlier
one I bought didn't have the bump but also didn't have the extra plastic
at the end so it would go in one pin off. It looks like they do have ones
that look right such as 1-104482-8 but check width. The 3-87651-5 looks the
style that I bought that is too narrow.
- On 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