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Mon, 10 Aug 2020 13:08:43 -0400 (EDT) From: Lawrence Stewart Message-Id: <81311578-1C53-47F3-930C-8F0A950D4284@serissa.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_A6A69313-EB96-452F-B46B-0BC4C517BB63" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Mon, 10 Aug 2020 13:08:20 -0400 In-Reply-To: <20200810140216.47CB418C082@mercury.lcs.mit.edu> To: Noel Chiappa References: <20200810140216.47CB418C082@mercury.lcs.mit.edu> X-Mailer: Apple Mail (2.3608.80.23.2.2) Subject: Re: [TUHS] BTL summer employees X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --Apple-Mail=_A6A69313-EB96-452F-B46B-0BC4C517BB63 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 2020, Aug 10, at 10:02 AM, Noel Chiappa = wrote: >=20 >> From: Lars Brinkhoff >=20 >> I haven't investigated it thoroughly, but I do see a file = .DOVR.;.SPOOL >> 8 written in C by Eliot Moss. >> ... >> When sending to the DOVER, the spooler waits until Spruce is >> free before sending another file. >=20 > Ah, so there was a spooler on the ITS machine as well; I didn't = know/remember > that. >=20 > I checked on CSR, and it did use TFTP to send it to the Alto spooler: >=20 > HOST MIT-SPOOLER, LCS 2/200,SERVER,TFTPSP,ALTO,[SPOOLER] >=20 > I vaguely recall the Dover being named 'Spruce', but that name wasn't = in the > host table... I have this vague memory that 'MIT-Spooler' was the Alto = which > prove the Dover, but now that I think about it, it might have been = another one > (which ran only TFTP->EFTP spooler software). IIRC the Dover as a pain = to run, > it required a very high bit rate, and the software to massage it was = very > tense; so it may have made sense to do the TFTP->EFTP (I'm pretty sure = the > vanilla Dover spoke EFTP, but maybe I'm wrong, and it used the PUP = stream > protocol) in another machine. >=20 > It'd be interesting to look at the Dover spooler on ITS, and see = if/how one > got to the CHAOS network from C - and if so, how it identified the = protocol > translating box. >=20 > Noel =E2=80=9CA pain to run=E2=80=9D and =E2=80=9Ctense=E2=80=9D indeed! The = Dover printing system was an Alto (6 MIPs ) driving = =E2=80=9COrbit=E2=80=9D hardware about half the size of the Alto = itself*, driving the raster video to the printer. The hardware was = called =E2=80=9Corbit=E2=80=9D because it could directly =E2=80=9COR=E2=80= =9D bits into the raster image, rather than requiring read-modify-write = cycles. =E2=80=9CSpruce=E2=80=9D was the spooler and printer driver = that ran on the Alto. Evidently the hardware is a typical Butler = Lampson knife edge design up in the corner of what was possible, = implemented by Bob Sproull and Severo Ornstein. Additional software by = Dan Swinehart. There=E2=80=99s a page about this in = https://bwlampson.site/38-AltoSoftware/Abstract.html = and a patent = https://patents.google.com/patent/US4203154 = . I have a feeling I=E2=80=99= ve seen a longer description of Orbit somewhere but I can=E2=80=99t = remember where. Like most Stanford folks of the era I printed my thesis on one, assisted = about 1 AM by Lyle Ramshaw who knew where to get a new drum for the = printer. In any event, a vast improvement over the XGP and a godsend for those of = us who have a phototypesetter. * An earlier one-off called EARS had printer hardware about 3 times the = size of the attached Alto. That one was font-image based. To do things = like lines and graphics the software constructed custom font glyphs to = make up the image. --Apple-Mail=_A6A69313-EB96-452F-B46B-0BC4C517BB63 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On 2020, Aug 10, at 10:02 AM, Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:

From: Lars Brinkhoff

I haven't investigated it thoroughly, but I do see a file = .DOVR.;.SPOOL
8 written in C by Eliot Moss.
...
When sending to the DOVER, the spooler = waits until Spruce is
free before sending another file.

Ah, so there was a spooler on the = ITS machine as well; I didn't know/remember
that.

I checked on CSR, and it did use TFTP to send = it to the Alto spooler:

 HOST = MIT-SPOOLER,       LCS = 2/200,SERVER,TFTPSP,ALTO,[SPOOLER]

I = vaguely recall the Dover being named 'Spruce', but that name wasn't in = the
host table... I have this vague memory that = 'MIT-Spooler' was the Alto which
prove the Dover, but now = that I think about it, it might have been another one
(which= ran only TFTP->EFTP spooler software). IIRC the Dover as a pain to = run,
it required a very high bit rate, and the software to = massage it was very
tense; so it may have made sense to do = the TFTP->EFTP (I'm pretty sure the
vanilla Dover spoke = EFTP, but maybe I'm wrong, and it used the PUP stream
protocol) in another machine.

It'd= be interesting to look at the Dover spooler on ITS, and see if/how = one
got to the CHAOS network from C - and if so, how it = identified the protocol
translating box.

  Noel

=E2=80=9CA pain to run=E2=80=9D and =E2=80=9Ctense=E2=80=9D = indeed!  The Dover printing system was an Alto (6 MIPs = <microinstructions>) driving =E2=80=9COrbit=E2=80=9D hardware = about half the size of the Alto itself*, driving the raster video to the = printer.  The hardware was called =E2=80=9Corbit=E2=80=9D because = it could directly =E2=80=9COR=E2=80=9D bits into the raster image, = rather than requiring read-modify-write cycles.  =E2=80=9CSpruce=E2=80= =9D was the spooler and printer driver that ran on the Alto. =  Evidently the hardware is a typical Butler Lampson knife edge = design up in the corner of what was possible, implemented by Bob Sproull = and Severo Ornstein.  Additional software by Dan =  Swinehart.

There=E2=80=99s a page about this in https://bwlampson.site/38-AltoSoftware/Abstract.html a= nd a patent https://patents.google.com/patent/US4203154.  I have = a feeling I=E2=80=99ve seen a longer description of Orbit somewhere but = I can=E2=80=99t remember where.

Like most Stanford folks of the era I = printed my thesis on one, assisted about 1 AM by Lyle Ramshaw who knew = where to get a new drum for the printer.

In any event, a vast improvement over = the XGP and a godsend for those of us who <didn=E2=80=99t> have a = phototypesetter.

* An earlier one-off called EARS had printer hardware about 3 = times the size of the attached Alto.  That one was font-image = based.  To do things like lines and  graphics the software = constructed custom font glyphs to make up the image.


= --Apple-Mail=_A6A69313-EB96-452F-B46B-0BC4C517BB63--