- chicken and egg
- Posted by Alan Connor on October 21st, 2003
On Tue, 21 Oct 2003 23:12:53 +0200, Peter Köhlmann <Peter.Koehlmann@t-online.de> wrote:
<snip>
Wow! Thanks.
I don't think the above is true at all, although it seems to be at first
glance.
Computers and the infrastructure of the Internet are very material things,
and a great deal of mining/refining/transporting/manufacturing/energy_gener-
ation goes on to create and maintain it.
All of those activities require land to be removed from primary nature, and
being as there is only Forest/Grassland/Wetland/Desert to be had, it is a
safe bet that a lot of Forested lands bit the dust, and will continue to do
so, to make it possible for you and I to send messages on the Internet.
More than 1/2 of the world's forests are gone, and just logging doesn't
account for more than a fraction of that figure.
When you remove forest from primary nature in order to create/maintain
something like the Internet, then you have to include in your calculations
all FUTURE generations of trees that would have existed on that land.
--
Alan C
Chronic Netiquette violators killfiled for 30 days. That includes PGP sigs.
- Posted by Jean-David Beyer on October 22nd, 2003
Tauno Voipio wrote (in part):
Sounds about as much fun as booting a PDP-5 with the little toggle
switches and some buttons on the front panel. 8-(
I had a Computer Control Corp. DDP-224 (24-bit words, fixed and floating
point op-codes, Accumulator, MQ register, three index registers (but one
was used for the exponent in floating point computations), 16 levels of
priority interrupts, in the late 1960s that had a symbolic relocating
assembler and a FORTRAN compiler (they were incompatable in the sense
that they arranged things in COMMON in opposite orders so you could not
really write assembler routines and have them work with FORTRAN ones). I
wrote an OS for the machine (I had an OS for the machine that a friend
wrote: it took 256 words or RAM, so I could bootstrap more easily than
you). When the OS was pretty well working, I revised the assembler to
assemble COMMON space the same way the compiler did, changed the
link-editor-loader so that the memory space used by most of the loader
could be reused for COMMON space (the hardware could have 32K words of
memory, but we ran out of money at 16K words, and the OS took 4K). My
machine had two 40Megabyte hard drives (each the size of a washing
machine). That was not usual for minicomputers at the time.
--
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/( )\ Shrewsbury, New Jersey http://counter.li.org
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- Posted by Shmuel (Seymour J.) Metz on October 23rd, 2003
In <3f8fa279@news.comindico.com.au>, on 10/17/2003
at 08:04 AM, faeychild <nykysle@yah@@.com> said:
By hand. There's no reason to do that these days, since other
compilers already exist.
--
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- Posted by Shmuel (Seymour J.) Metz on October 23rd, 2003
In <jjbysxveflzcngvpbpna.hmwpqt6.pminews@news1.sympat ico.ca>, on
10/17/2003
at 11:01 AM, "Wolf Kirchmeir" <wwolfkir@sympatico.can> said:
No. Not all computers are binary.
The circuitry took care of that.
Don't confuse a bootstrap loader with an interpreter.
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- Posted by Shmuel (Seymour J.) Metz on October 23rd, 2003
In <jxRjb.149$S52.136@newsread4.news.pas.earthlink.ne t>, on 10/17/2003
at 12:47 PM, mjt <mjtobler@removethis_consultant.com> said:
He asked about the *FIRST* compiler, not about how to bootstrap once
you already had a compiler. The first compiler was written in machine
code.
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- Posted by Shmuel (Seymour J.) Metz on October 23rd, 2003
In <FfUjb.29675$Rd4.3915@fed1read07>, on 10/17/2003
at 03:50 PM, Stefan Patric <tootek2@yahoo.com> said:
Or decimal. Anyone know what radix EDSAC, ENIAC and SEAC used?
--
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- Posted by Shmuel (Seymour J.) Metz on October 23rd, 2003
In <lzy8vjbfg7.fsf@localhost.localdomain>, on 10/17/2003
at 04:40 PM, cpw@rahul.net (C. P. Weidling) said:
Machine code. Assemblers are also compilers.
Machine code. Google for IBM 704.
--
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- Posted by Lew Pitcher on October 25th, 2003
Shmuel (Seymour J.) Metz wrote:
Contents of the Addressing Register- /
/
Contents of the Decrement Register --------'
--
Lew Pitcher
Master Codewright and JOAT-in-training
Registered Linux User #112576 (http://counter.li.org/)
Slackware - Because I know what I'm doing.
- Posted by Shmuel (Seymour J.) Metz on October 27th, 2003
In <paqcnb.6e2.ln@merlin.l6s4x6-4.ca>, on 10/24/2003
at 11:24 PM, Lew Pitcher <lpitcher@sympatico.ca> said:
Just address. the tem comes from one op the instruction formats on the
704, which had a 3-bit opcode, a 15 bit decrement, a 3-bit tag and a
15-bit address field in a 36-bit word.
--
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- Posted by Jean-David Beyer on October 27th, 2003
Shmuel (Seymour J.) Metz wrote:
Not quite. IIRC, the 704 had about 86 op codes, and clearly they would
not fit into 3 bits. IIRC, the op-code 0 instruction did not use the
decrement in the usual way, so there were potentially 2^15 sub op-codes
available there. Not all were used.
--
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- Posted by Shmuel (Seymour J.) Metz on October 29th, 2003
In <3F9D62E6.3020906@d.b>, on 10/27/2003
at 01:24 PM, Jean-David Beyer <j@d.b> said:
Take another look.
That's why I said one of the formats. Think of it as Huffman encoding.
TXL(-3), TNX(-2), STR)-1), TXI(+1), TIX(+2), TXH(+3) had 3-bit
opcodes. Most of the rest had 12-bit opcodes.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
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- Posted by Rich Grise on November 5th, 2003
Strictly speaking, punched cards came way before computers, or
even electricity! Look up "Jacquard Loom."
Eggert Ehmke wrote:
- Posted by Lew Pitcher on November 6th, 2003
Rich Grise wrote:
And programming came about the same time. Look up Ada Countess Lovelace, and
Charlse Babbage
--
Lew Pitcher
Master Codewright and JOAT-in-training
Registered Linux User #112576 (http://counter.li.org/)
Slackware - Because I know what I'm doing.
