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Path: lyra.csx.cam.ac.uk!ard12
From: ard12@eng.cam.ac.uk (A.R. Duell)
Newsgroups: alt.folklore.computers,comp.sys.cbm
Subject: Re: PET GPIB-serial interface box
Date: 7 Dec 1995 18:38:13 GMT
Organization: University of Cambridge, England
Message-ID: <4a7cal$7n1@lyra.csx.cam.ac.uk>
References: <4a3ufq$gg6@nyheter.chalmers.se>
NNTP-Posting-Host: tw500.eng.cam.ac.uk
hcb@phc.chalmers.se (Hans-Christian Becker) writes:
>Hi everyone!
>I have a magic box that used to interface a commodore PET to a serial
>printer (or so I'm told!). It is made by TNW Corporation and is called
>TNW-2000. The board is (c) 1979. This box has a standard GPIB connector
>together with a PET User Port card connector, and a standard RS 232
>connector.
>The design seems to be centered around a "AY-5-1013A" 40-pin chip, with
>some TTL circuitry around.
>Unfortunately, the manuals seem to have been thrown out, together with
>the PETs. Does anyone know *anything* about this thing??? If it is a
>full GPIB-serial converter, it would be very useful to me - if it is
>not, it will have to go back into the bookshelf again (sniff).
At a guess :
The 'User Port' connector is in fact designed to fit on the GPIB
connector of the original PETs which was a similar 12 pin double-sided
edge connector. I'll guess it is wired pin-to-pin to the 24 pin GPIB
amphenol connector
The AY-5-1013 is a UART. That'll handle the parallel to serial
conversion. The TTL logic will handle the GPIB handshake, etc.
Get a data sheet on the UART or on any of a number of pin-compatable
(modulo pin 2) ones, like the AY-3-1015, 6402, 1602, etc. See if there
are connections made to the outputs of the receive register. If so, the
it's likely the thing is bidirectional, if not, then it's output only - a
lot of PET printer interfaces were.
Be careful : The handshake timing requirements of the pet were much more
sloppy than those of a standard GPIB controller. I've found several pet
peripherals that will not work on HP machines because of this.
It probably responds to address 4, at least for output.
It'll need a controller on the GPIB side - you'll not be able to use it
to hang a set of GPIB instruments off a serial port.
>Thanks in advance & happy computing!
>/hcb
--
-tony
ard12@eng.cam.ac.uk
The gates in my computer are AND,OR and NOT, not Bill