We did in my undergraduate program: I wrote a 10-card loader that was 11 cards long (;-)) winning a prize for "you can;t do that!" --dave On 2020-05-01 2:45 p.m., Lennart Sorensen via talk wrote: On Fri, May 01, 2020 at 12:14:11PM -0400, D. Hugh Redelmeier via talk wrote: Yeah. I only used PDP-8 computers before floppies had been invented. You didn't have to remember the RIM loader for the PDP-8/I, it was silk-screened onto the console. <https://upload.wikimedia.org/wikipedia/commons/e/e0/PDP-8_I_Bedienfeld_%28simuliert%29.png><https://upload.wikimedia.org/wikipedia/commons/e/e0/PDP-8_I_Bedienfeld_%28simuliert%29.png> You didn't often need to use it since its only purpose was to load the BIN loader, and that usually persisted (core memory FTW!). I wonder if the developers had competitions on who could write the shortest working loader program. -- David Collier-Brown, | Always do right. This will gratify System Programmer and Author | some people and astonish the rest dave.collier-brown@indexexchange.com<mailto:dave.collier-brown@indexexchange.com> | -- Mark Twain CONFIDENTIALITY NOTICE AND DISCLAIMER : This telecommunication, including any and all attachments, contains confidential information intended only for the person(s) to whom it is addressed. Any dissemination, distribution, copying or disclosure is strictly prohibited and is not a waiver of confidentiality. If you have received this telecommunication in error, please notify the sender immediately by return electronic mail and delete the message from your inbox and deleted items folders. This telecommunication does not constitute an express or implied agreement to conduct transactions by electronic means, nor does it constitute a contract offer, a contract amendment or an acceptance of a contract offer. Contract terms contained in this telecommunication are subject to legal review and the completion of formal documentation and are not binding until same is confirmed in writing and has been signed by an authorized signatory.