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Stephen HoffmanOne of the lesser-known units of time measurement is the microfortnight.The microfortnight unit exists in VAX/VMS because the console hardware clock interrupts used in the VAX-11/730 console measure elapsed time in a unitthat differs from a second. This hardware interrupt frequency choice affects timeouts related to console operations.(Note: Once VAX/VMS is booted, things related to timekeeping and timers all work as expected, and seconds are a second in length. But when running the console program, not so much.)This also led to the creation of the SD730 Fixed Head Solar Horologue option; a sundial intended to assist with tinekeeping.<a href="https://slashdot.org/comments.pl?sid=76256&cid=6805264" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://slashdot.org/comments.pl?sid=76256&cid=6805264</a><a href="https://infosec.exchange/tags/digitalequipment" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#digitalequipment</a> <a href="https://infosec.exchange/tags/vax" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax</a> <a href="https://infosec.exchange/tags/vax11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax11</a> <a href="https://infosec.exchange/tags/humor" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#humor</a> <a href="https://infosec.exchange/tags/vms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vms</a> <a href="https://infosec.exchange/tags/openvms" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#openvms</a>

Stephen HoffmanApropos of nothing, VAX-11/751 was a rackmount variant of the VAX-11/750, and intended for OEM integration. Aside from reorganizing the internals to fit into the rack, it was otherwise identical to the VAX-11/750.There’s a photo here: <a href="https://encyclopedia.pub/entry/35731" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://encyclopedia.pub/entry/35731</a>While all released models of VAX were air-cooled, the VAX 9000 “mainframe” models were originally planned to be water cooled. Engineers were able to sufficiently cool the VAX 9000 with air and this avoiding the added plumbing, which led to the “Aridus“ variant of “Aquarius” shipping.<a href="https://infosec.exchange/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://infosec.exchange/tags/vax" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax</a> <a href="https://infosec.exchange/tags/vax11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax11</a> <a href="https://infosec.exchange/tags/digitalequipment" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#digitalequipment</a>

Peter Bosch<a href="https://hsnl.social/@revspace" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@revspace</a> After a few days of work, implementing 3 missing libc functions, repairing an extra 4MB of RAM, hacking around toolchain issues, we finally got Lynx 2.8.2 compiled and running on the VAX-11/750 (in 4.3 BSD Quasijarus)! That means we got to browse the (non-HTTPS) web using no equipment or parts newer than 1986 this side of the network (besides the AUI 10Base-T phy).<a href="https://hsnl.social/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://hsnl.social/tags/theoldweb" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#theoldweb</a> <a href="https://hsnl.social/tags/hackaday" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hackaday</a> <a href="https://hsnl.social/tags/dec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#dec</a> <a href="https://hsnl.social/tags/vax11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax11</a>

Peter BoschDecided to display the VAX-11/750 at the <a href="https://hsnl.social/@revspace" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@revspace</a> open day yesterday. All the hard work seems to have paid off, managed to get 18 hours of uptime out of it before shutting it down at the end of the day! <a href="https://hsnl.social/tags/unix" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#unix</a> <a href="https://hsnl.social/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#retrocomputing</a> <a href="https://hsnl.social/tags/dec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#dec</a> <a href="https://hsnl.social/tags/vax11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax11</a> <a href="https://hsnl.social/tags/minicomputer" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#minicomputer</a> <a href="https://hsnl.social/tags/unixhistory" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#unixhistory</a> <a href="https://hsnl.social/tags/bsd" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#bsd</a>

BoscoTo restore the Robotron K1840 (VAX11/780), the PDP11/03 must first be running in the correct configuration. For this I am looking for a working CPU card like this one. Who can help?<a href="https://social.tchncs.de/tags/VAX11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#VAX11</a> <a href="https://social.tchncs.de/tags/DEC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DEC</a> <a href="https://social.tchncs.de/tags/robotron" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#robotron</a> <a href="https://social.tchncs.de/tags/K1840" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#K1840</a>

BoscoContinue working on the Robotron K1840 with <a href="https://chaos.social/@dm2lct" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@dm2lct</a> Check contacts and test the PDP11 memory for reading the microcode.<a href="https://social.tchncs.de/tags/rechenwerk" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#rechenwerk</a> <a href="https://social.tchncs.de/tags/pdp11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#pdp11</a> <a href="https://social.tchncs.de/tags/vax" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax</a> <a href="https://social.tchncs.de/tags/dec" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#dec</a> <a href="https://social.tchncs.de/tags/vax11" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#vax11</a>/780

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