I seem to remember that at some point early on, we spent some of our capital budget on buying another 16K bytes for the PDP-11.  As I recall, the deal was that the OS got 8K and users got 8K.  I also recall that that purchase was 20% of our capital budget for the year... Doug, did I remember this correctly? Steve ----- Original Message ----- From: "Doug McIlroy" &lt;doug(a)cs.dartmouth.edu&gt; To:<tuhs@minnie.tuhs.org> Cc: Sent:Sun, 21 Jan 2018 11:51:29 -0500 Subject:[TUHS] Subject: Re: KernelSizesA self-imposed limit of 16K held in v1, and was quite fullyutilized.Subject:Re: Kernel Sizes A self-imposed limit of 16K held in v1, and was quite fully utilized. When the iernel was rewritten in C, the limit (perhaps larger by then) influenced the C compiler. More than one optimization was stimulated by the need to keep the kernel in bounds. Doug