FYI -- "Will you still need me, will you still feed me When I'm 64?" I've now lived through: decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!) It remains to be seen if I'll make it to 128 or 256... Son of a bits! --- https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-... Apple To Phase Out 32-Bit Mac Apps Starting In January 2018 Apple will be phasing out 32-bit apps with iOS 11, and soon the company will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! --- https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-...
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-...
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers. -- Gene On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller <victorsmiller@gmail.com> wrote: And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-...
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
Manchester Atlas I with 48-bit words. WFL On 6/8/17, Eugene Salamin via math-fun <math-fun@mailman.xmission.com> wrote:
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers.
-- Gene
On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller <victorsmiller@gmail.com> wrote:
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement
On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-...
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Well I remember in my childhood carving wooden beads for my abacus. Or was I put to work turning the crank for a differential engine? Ah yes, I remember it well. Hilarie
On 6/7/2017 4:25 PM, Eugene Salamin via math-fun wrote:
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers.
-- Gene
mine was a: https://en.wikipedia.org/wiki/IBM_1620. it had 20k 6 bit bytes and a https://en.wikipedia.org/wiki/Word_(computer_architecture)#Variable_word_len... thanks
On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller <victorsmiller@gmail.com> wrote:
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement
On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10, DEC-20) 12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash drives"!), 6800, etc.) 16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to-phase-out-32-bit-...
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett http://tayek.com/
Thank you all for making this 57-year-old feel like a young whippersnapper. I don't get that experience a lot these days. :-) Jim Propp On Thursday, June 8, 2017, Ray Tayek <rtayek@ca.rr.com> wrote:
On 6/7/2017 4:25 PM, Eugene Salamin via math-fun wrote:
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers.
-- Gene
mine was a: https://en.wikipedia.org/wiki/IBM_1620. it had 20k 6 bit bytes and a https://en.wikipedia.org/wiki/Word_(computer_architecture)#V ariable_word_length
thanks
On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller < victorsmiller@gmail.com> wrote:
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement
On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines…
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10,
DEC-20)
12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash
drives"!), 6800, etc.)
16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to- phase-out-32-bit-mac-apps-starting-in-january-2018
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett http://tayek.com/
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
There's something called Vintage Computer Federation, vcfed.org. They're having an event at the Computer Museum (Mountain View) in August. I don't know how real they are. Rich ----- Quoting James Propp <jamespropp@gmail.com>:
Thank you all for making this 57-year-old feel like a young whippersnapper. I don't get that experience a lot these days. :-)
Jim Propp
On Thursday, June 8, 2017, Ray Tayek <rtayek@ca.rr.com> wrote:
On 6/7/2017 4:25 PM, Eugene Salamin via math-fun wrote:
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers.
-- Gene
mine was a: https://en.wikipedia.org/wiki/IBM_1620. it had 20k 6 bit bytes and a https://en.wikipedia.org/wiki/Word_(computer_architecture)#V ariable_word_length
thanks
On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller < victorsmiller@gmail.com> wrote:
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement
On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines?
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10,
DEC-20)
12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash
drives"!), 6800, etc.)
16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to- phase-out-32-bit-mac-apps-starting-in-january-2018
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett? http://tayek.com/
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
On 6/8/2017 10:03 PM, rcs@xmission.com wrote:
There's something called Vintage Computer Federation, vcfed.org. They're having an event at the Computer Museum (Mountain View) in August. I don't know how real they are.
Rich
does anyone know of a working 9-track tape drive? i have an old pdp-10 backup tape. thanks
----- Quoting James Propp <jamespropp@gmail.com>:
Thank you all for making this 57-year-old feel like a young whippersnapper. I don't get that experience a lot these days. :-)
Jim Propp
On Thursday, June 8, 2017, Ray Tayek <rtayek@ca.rr.com> wrote:
On 6/7/2017 4:25 PM, Eugene Salamin via math-fun wrote:
My first computer was the IBM 650. It had 2000 10-decimal digit words stored on a rotating magnetic drum. Senior year in high school class in applied math in 1959, IBM gave us access to their computer. It was punch cards, card sorters, and line printers.
-- Gene
mine was a: https://en.wikipedia.org/wiki/IBM_1620. it had 20k 6 bit bytes and a https://en.wikipedia.org/wiki/Word_(computer_architecture)#V ariable_word_length
thanks
On Wednesday, June 7, 2017, 3:52:26 PM PDT, Victor Miller < victorsmiller@gmail.com> wrote:
And 60 bit (cdc). I also programmed a univac 418 -- 18 bit 1's complement
On Wed, Jun 7, 2017 at 18:40 Tom Knight <tk@mit.edu> wrote:
You left out the 40 bit machines?
On Jun 7, 2017, at 3:50 PM, Henry Baker <hbaker1@pipeline.com> wrote:
FYI --
"Will you still need me, will you still feed me When I'm 64?"
I've now lived through:
decimal computers (IBM 1620, IBM 1401) 36-bit/15-18bit-address computers (IBM 7040, IBM 7090, GE635, PDP-10,
DEC-20)
12-bit computers (PDP-8) Microcoded machines (Xerox Alto, Lisp Machines) 1-bit computers (ICL DAP 32x32x1 "square word", Connection Machine) 4-bit computers (Intel 4004) 8-bit computers (6502, Z-80, 8080, 8051 (still used inside "USB flash
drives"!), 6800, etc.)
16-bit computers (PDP-11, Moto 68000, 8086, etc.) 32-bit computers (IBM 360, VAX, 80386, ARM, etc.) 64-bit computers (everyone!)
It remains to be seen if I'll make it to 128 or 256...
Son of a bits! ---
https://apple.slashdot.org/story/17/06/07/0538233/apple-to- phase-out-32-bit-mac-apps-starting-in-january-2018
Apple To Phase Out 32-Bit Mac Apps Starting In January 2018
Apple will be phasing out 32-bit apps with iOS 11, and soon the company
will make the same changes on its macOS operating system. During its Platform State of the Union keynote at the Worldwide Developers Conference, Apple told developers that macOS High Sierra will be the "last macOS release to support 32-bit apps without compromises."
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett? http://tayek.com/
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett http://tayek.com/
On 6/7/2017 3:39 PM, Tom Knight wrote:
You left out the 40 bit machines…
and 60 bit machines: https://en.wikipedia.org/wiki/CDC_6600 thanks -- Honesty is a very expensive gift. So, don't expect it from cheap people - Warren Buffett http://tayek.com/
"HB" == Henry Baker <hbaker1@pipeline.com> writes:
HB> It remains to be seen if I'll make it to 128 or 256... RiscV has defined a 128 bit platform. And there is a ecma-script (of all things) emulator for it. So you are virtually there! -JimC -- James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6
Also the ROMP -- a 24 bit word (this was an IBM Risc machine) On Wed, Jun 7, 2017 at 20:52 James Cloos <cloos@jhcloos.com> wrote:
"HB" == Henry Baker <hbaker1@pipeline.com> writes:
HB> It remains to be seen if I'll make it to 128 or 256...
RiscV has defined a 128 bit platform.
And there is a ecma-script (of all things) emulator for it.
So you are virtually there!
-JimC -- James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Didn't the. CDC 1604 have 48 bit words? On Wed, Jun 7, 2017 at 21:17 Victor Miller <victorsmiller@gmail.com> wrote:
Also the ROMP -- a 24 bit word (this was an IBM Risc machine)
On Wed, Jun 7, 2017 at 20:52 James Cloos <cloos@jhcloos.com> wrote:
> "HB" == Henry Baker <hbaker1@pipeline.com> writes:
HB> It remains to be seen if I'll make it to 128 or 256...
RiscV has defined a 128 bit platform.
And there is a ecma-script (of all things) emulator for it.
So you are virtually there!
-JimC -- James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
I remember an IBM FORTRAN manual stating that arrays were stored in "natural" order -- backwards! The index registers on the 709/7090/7094 subtracted. Victor On Wed, Jun 7, 2017 at 21:19 Victor Miller <victorsmiller@gmail.com> wrote:
Didn't the. CDC 1604 have 48 bit words?
On Wed, Jun 7, 2017 at 21:17 Victor Miller <victorsmiller@gmail.com> wrote:
Also the ROMP -- a 24 bit word (this was an IBM Risc machine)
On Wed, Jun 7, 2017 at 20:52 James Cloos <cloos@jhcloos.com> wrote:
>> "HB" == Henry Baker <hbaker1@pipeline.com> writes:
HB> It remains to be seen if I'll make it to 128 or 256...
RiscV has defined a 128 bit platform.
And there is a ecma-script (of all things) emulator for it.
So you are virtually there!
-JimC -- James Cloos <cloos@jhcloos.com> OpenPGP: 0x997A9F17ED7DAEA6
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
My high school had a couple of computers. The main one was a PDP-8e, and the lesser-known one was a PDP-4 (which was kept in one of the teacher's offices; most people didn't know it was there). The PDP-4 was very interesting. It was an 18-bit machine. I don't think it had any integrated circuits at all - just transistors, resistors, capacitors, etc. It came with a full set of prints which I never really looked at, but a friend of mine did. My understanding was that it used "negative logic", which I believe meant low for 1 and high for 0. It had a variable speed control, which was fun to play with. You'd enable it, then you could turn it down all the way to a point where there was a second or so between cycles. It also had a monstrous looking baudot console, with "figure shift" and "letter shift". The console was seriously prehistoric looking. It supported both 1's and 2's complement arithmetic - I guess the jury was still out on which was better, so they implemented both. I believe it was a successor of, and architecturally similar to, the PDP-1. Here's a PDP-4 manual: http://archive.computerhistory.org/resources/text/DEC/pdp-4/DEC.PDP4.1963.10... Tom
participants (11)
-
Eugene Salamin -
Fred Lunnon -
Henry Baker -
Hilarie Orman -
James Cloos -
James Propp -
Ray Tayek -
rcs＠xmission.com -
Tom Karzes -
Tom Knight -
Victor Miller