From mboxrd@z Thu Jan 1 00:00:00 1970 From: bqt@update.uu.se (Johnny Billquist) Date: Wed, 6 Jan 2016 12:55:21 +0100 Subject: [TUHS] PDP-11 MARK (was: Early Unix function calls: expensive?) In-Reply-To: References: Message-ID: <568D00A9.9090108@update.uu.se> On 2016-01-06 01:54, Dave Horsfall wrote: > On Mon, 4 Jan 2016, Ronald Natalie wrote: >> >Just never figured out how to make good use of the MARK instruction on >> >the PDP-11. > RSX-11 probably used it, though, as could've RSTS... Nope. Nothing in RSX uses it. As others said, probably nothing anywhere used it. And, as I pointed out, if you use MARK, then you cannot really use split I/D-space, since the stack (data) needs to be in instruction space. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol