I was able to do something positively useful today, as well as cleaning up and checking doors (see entry below), and this was to (a) check the BOMs that we have, for imminent display in the USB and (b) retrieve some spare bulbs 🙂
This is a BOM – Basic Operational Memory Unit. (It has nothing to do with Bletchley’s Bombes) :
Roger tells you all about BOMs here — it’s a great web page; see the link 3rd from bottom, which shows you where the BOMs fit in on the 360-67 mainframe. There were eight BOMs in 1967 (in two immense cabinets), but NUMAC later bought another two memory units, thus making 16 in all … thus giving this juggernaut One Whole Megabyte of memory. There are two in the Collection: one wonders where the other 14 went — not all to the scrapman, I’ll bet.
I also retrieved some spare bulbs that we can put in any blank holes that we find in the 360 console or the DAT panel — I knew we had some somewhere, and by golly I found them.