PDP-11 booting, RL02 working!

Thanks for sharing your work, Charles. I have a somewhat similar problem, but have not found time to investigate during the last holidays ... :-( I have 3 RL drive in one chain, and two come up "normal". The 3rd has the READY lamp on continuous, right from power-up. If I try to boot (from one of the other two), the READY lamp of that drive flashes once. Then the RUN lamp (on the 11/34) goes off. Checking memory shows that the first word at address 000000 contains 000240 (which is correct, AFAIK), but all next words are *written* 000000. Of those zeroes I am sure, because I filled the memory with 000005 before I tried to boot. So, from your story, checking the cable might be a good idea. And that is done in just a few minutes. BTW, somebody told me (long ago) that you better run XXDP with the WRITE-PROT button pressed (lamp lit) ...! Anyway, congrats on booting your machine! - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.