On Sun, Nov 27, 2016 at 11:46:46AM -0800, W2HX wrote:
Hi folks,
This is my first vintage computing project. I have a PDP-8/e with the
following boards in this order.
Nice machine. Strange that you are missing a serial interface.
Each core pair is 16KW. There are a bunch of other
non-DEC boards
(ECRM) that I have removed for the time being. You will notice that I
have no serial board (yet. I have a line on one).
What are those boards?
Next, I will put the boards back in and start testing.
I am looking
for some very simple programs that I can key in from the front panel
to do some basic testing. I have found simple programs on the internet
but they are all in assembler and I don't yet have the knowledge/tools
to convert them to switch-enterable programs. For example, here are
some good test programs but not directly enterable on the front panel
(or at least I don't know how).
http://dustyoldcomputers.com/pdp8/pdp8i/testprogs/index.html
On the same site you will find palbart which is really handy for
assembling programs from source.
But if you look at the testprogs, you have all you need, for instance:
http://dustyoldcomputers.com/pdp8/pdp8i/testprogs/acmqblinker.html
The second column is memory address and the third column is the
instruction, both values is in octal.
So, first set the switch register to 0000, which is all switches _down_.
The press "LOAD ADDR" and next enter 2020, which is switch 1 and 7 up,
all other down. Then press DEP. Notice the address should increment with
one. Then deposit 5000, 7200 and so on from the list of instructions.
Finally set the SR to 0000, press LOAD ADDR, CLEAR and CONT. If all
works you should have a running program that blinks the lights in some
pattern.
Here is some more details on how to use the console:
http://www.bernhard-baehr.de/pdp8e/kc8ea_operating.html
Good luck,
Pontus.