Running a paper tape based system.
In the early 1970's I worked for a company called C&N Electrical based near
where I lived (and still do live) in Newbury UK.
They were a division of Camper & Nicholson a boat building company. (They
made beautiful wooden yachts.) Anyway the bit I worked for did a large
range of electronic subcontract work.
They had a contract to test and repair core store memory units from computer
systems made by a UK manufacturer called Elliot Automation.
The test computer system was made up of two or three racks, not 19" but more
like the wide lateral filing cupboards you see in offices. There was what I
would call an I/O station that had two high speed tape readers, two tape
punches and two IBM Golf ball typewriters without keyboards.
Guess who got the job of testing and repairing the memory units? The memory
themselves consisted of a unit about three feet long, twelve inches high and
six inches deep. At either end were plug in PCB's and in the middle the core
stack in a sealed box. These were made by a then well known company called
Mullard. I think (forty years is long time) they were 4k each.
I would take a unit, stick it on the bench, put some long cables on it and
connect it in the place of one of the good memory units in the rack.
I had a test tape that would load via one of the readers. The tape was
rolled up into a spool, you put that on a feed unit (a metal pin in a lump
of wood), the end of the tape then went into the reader. There was a tape
load switch that fed the tape to the start position. Then you flipped the
system load switch and the tape read into the system. Finally you hit the
system run switch and the program would start.
Once through the reader the loose tape was caught in a large box. I would
then fish out the start of the tape and rewind it with a manual movie film
rewinder
The program once loaded read and wrote the store with known patterns and you
could diagnose or set up the store read/write electronics (lots of OC71 and
OC81 transistors)
After repairing or setting up the unit I ran a confidence test which
consisted of a program designed to calculate the handicaps for large yacht
racing. You loaded the program tape and then a data tape. The output printed
on one of the golf ball RO typewriters.
?
Rod Smallwood
?
?
-----Original Message-----
From: cctech-bounces at
classiccmp.org [mailto:cctech-bounces at
classiccmp.org]
On Behalf Of ben
Sent: 25 May 2012 21:49
To: cctalk at
classiccmp.org
Subject: Re: Software for OCR'ing paper tape?
On 5/25/2012 12:52 PM, Tony Duell wrote:
_Way_ before that!. There were Elliot optical tape
readers that used this
principle in the 1950s.
Come to think of it, didn;t the Colossus tape reader work this way?
That is a Pre-555 timer era, you don't expect to have paper tape back then.
The Colossus has the fastest paper taper reader out there I expect.
-tony
Ben.
BTW... I love the paper tape quote but I can't find it at the moment
about any faster reading and you got sticky bits of paper tape all
over the place.