home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: alt.sys.pdp8
- Path: sparky!uunet!destroyer!news.iastate.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!news
- From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
- Subject: DEC PDP-4
- Sender: news@news.uiowa.edu (News)
- Message-ID: <1992Nov10.171940.23807@news.uiowa.edu>
- Date: Tue, 10 Nov 1992 17:19:40 GMT
- Nntp-Posting-Host: pyrite.cs.uiowa.edu
- Organization: University of Iowa, Iowa City, IA, USA
- Lines: 80
-
- Our news server here at Iowa just died and is being reborn, so I thought
- I'd do a test posting.
-
- In looking through my July 1965 copy of "Digital Flip Chip Modules" (this
- is the predecessor of the well known "Digital Logic Handbook" series, but
- in loose leaf format), I came across the following references to the DEC
- PDP-4 computer:
-
- Page 8, a photograph shows a man at the console of a computer, inserting
- a Flip Chip module into a test fixture. The computer has "PDP-4" on one
- side of one of the 4 visible relay-racks, in 2" high letters. The caption
- is "Computer-controlled module tester performs complete electrical tests."
-
- Page 10 has a photo showing a man sitting in front of a Gardner Denver
- Wire Wrap machine, with a bit of an IBM keypunch off to one side. The
- caption reads "Back panel wiring for PDP-7 being done automatically from
- punched cards generated on a PDP-4 computer.
-
- There is one more picture that is relevant to the PDP-4. This is in the
- 1966-67 "Digital Logic Handbook" (Copyright 1966). I believe that this is
- the first edition. On page xii is a photo that I believe shows the same
- PDP-4 based module test fixture that was on Page 8 of the 1965 module
- handbook. The relay racks look like they've been rearranged, but the
- console, scope, and test fixture look the same, and the same archaic
- (pre ASR-33) teletype is on the worktable by the console.
-
- These photos suggest that the PDP-4 had the following physical
- configuration:
-
- From above __________ __________
- | | | | 2 pairs of CAB-1
- | | | | 19 relay racks
- | | | | (CAB-6 racks are
- |__________| |__________| possible -- the
- | | | | photos don't show
- | | | | the difference)
- | | | |
- |__________| _______|__________|________
- | |______| | Test fixture
- | | panel protrudes
- | | slightly over
- | | table top.
- |___________________________|
- _
- |\
- \ Direction of view in
- photos.
-
- From the side __________ __________
- | | | |
- | | | ________ |
- Raised aluminum| PDP-4 | ||[ ] || Big ugly Tektronics
- letters on |__________| ||[ ] || scope
- black top side |----------| || ||
- panel | | ||________||
- | | | | Analog output panel
- Bottom side | | |__________| to scope
- panel is dull | | | |
- pale color, | | |__________| Test fixture console
- standard | | |__________| Test fixture
- color of DEC | | ============================= Table top
- racks at the | | | |
- time was blue. | | | |
- | | | |
- |__________| |__________|
- ^
- |
- This rack is not visible
- in the 1966-67 photo,
-
- Neither photo shows the actual control panel of the PDP-4, unless it is the
- small panel above the test fixture console on the side of the right rack.
-
- Note that the french doors on the normal front sides of the racks are
- unbroken by any hint of a console or other decoration, and note that all
- of the console panels and the identifying PDP-4 panel are on what would
- normally be called the sides of the relay racks.
-
- Doug Jones
- jones@cs.uiowa.edu
-