Owen,
still interested in getting your PDP-11/34 to work? - I am just about to
reassemble mine after relocation.
RUN light off and display 000002 means the processor halted at memory
location 2, so it has probably executed a HALT instruction (opcode
000000) from location 0.
Try this: while holding the CNTRL button, press BOOT. This should launch
the program from your ROM. Depending on which type you have (look for
modules labeled M9301 or M9312 in slot 3 or 4, whatever is next to the
processor), your milage may vary here.
The console terminal should print four numbers in octal, followed by an
"_at_" or a "$" as a prompt in a new line ("Dave, my mind is going...").
Depending on the ROM, you may need to enter either 773000G (standard
start address and GO command, pressing the return key is _not_ required
here) or a two-letter device code to boot. The bootstrap module may also
be wired to boot from a predetermined device without asking.
BTW: The DL11-W has 20mA drivers as well as RS-232. (Note the "1488" and
"1489" chips being present as well as a number of transistors and other
discrete components.) Which set is used depends on the cable: the plug
will have some wire connections to code it for either 20mA current loop
or RS-232 / V.24. If you have the original cable with the usual DB-25
connector, it should be OK: current loop used a completely different
6-pin "Mate-n-Lock" connector.
For the settings at the terminal, I don't know your particular type, but
with most DEC lines you should be best prepared if you use XON/XOFF
handshake (for "Main Rcv Hndsk" / "Main Xmt Hdsk"). Since at PDP-11
times, the 8th bit was commonly used as a parity bit, set your terminal
to ignore this. Otherwise, you may get garbage characters instead of
about every second readable character. We may get this straight later,
when we know what operating system you have.
A RS-232 break signal can sometimes cause a PDP-11 to HALT (depending on
settings on the DL11-W board), so you may want to avoid this... (perhaps
by choosing an appropriate setting for the "Disconnect" option for now?)
So much from memory. If you need more details, let me know, and I'll dig
into the docs.
Good luck,
Andreas
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com
Received on Fri Jan 25 2002 - 04:00:35 GMT