<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Henry - the infamous Ken and Dennis picture: <a href="https://www.bell-labs.com/usr/dmr/www/ken-and-den.jpg">https://www.bell-labs.com/usr/dmr/www/ken-and-den.jpg</a> show the 11/20's display. Their is a console display is hidden behind the right most ASR-33 [the console for the 11/20, I think], and Ken is typing to another processor - it's either an 11/40 or 11/45, given the parts of the bezel shown in the picture. The picture also shows 2 RK's, 2 DEC Tape and a Paper Tape read/punch, and the Tek display on the table.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The Fifth Edition tape the low.s and conf.c list an 11/40 with drivers for the RK05, KL, DC serial, and the PPT unit. The Sixth edition is the first time we see mch40 and mch45. There is also a rkunix, rpunix and hpunix on the distribution tape. The l.s file shows KL, DEC Tape, 9-Track and RP04 drivers (but no DC-11s). We also see Ken's "sysfix" to deal with the separate I/D space.<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">So ... I'm would have suspected that the first 11/45 had an RP04 as well as at least one RK05, a TM-11 with a 9-track, and the DEC Tape unit. The amount of memory is, of course, unknown. It was pretty expensive in those days, but I would have expected they would have pushed it to the max [256K]. </div></div><div hspace="streak-pt-mark" style="max-height:1px"><img alt="" style="width:0px;max-height:0px;overflow:hidden" src="https://mailfoogae.appspot.com/t?sender=aY2xlbWNAY2NjLmNvbQ%3D%3D&type=zerocontent&guid=58064b2e-efe5-4e48-90dc-3e3f03659666"><font color="#ffffff" size="1">ᐧ</font></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jul 17, 2023 at 3:44 PM Henry Bent <<a href="mailto:henry.r.bent@gmail.com">henry.r.bent@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hello all,</div><div><br></div><div>I asked this question in a different thread but it may have been bogged down in other discussion so I figured it was worth asking again.</div><div><br></div><div>What was the hardware configuration of the 11/45 that Research used to implement early UNIX? This would be circa late 1972/earlty 1973. I have found numerous references to it being an early production 11/45, and I assume that it had an RK05, but I cannot find any details about things like memory size and other peripherals.</div><div><br></div><div>Since the only extant sources are for V1, which was as I understand only run on a singular 11/20, and V5 by which time UNIX had spread it doesn't seem possible to infer a hardware configuration from existing code.<br></div><div><br></div><div>-Henry<br></div></div>
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