Hi all... besides than the HP-95/100/200, what are
other DOS clamshells of the era? I'm aware of the
Atari Portfolio and the Poqet device, but there are
several more, methinks...
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I was browsing at the Goodwill yesterday and ran across what seemed
to be a new (out of box) Mattel Aquarius. It still had the plastic
protector on the wall wart pins, and there were no scratches on
those mains pins. The unit was clean overall with no noticable
scratches or wear. Has cassette cable. The downside: $24.95. White tag,
so no possibility of a discount.
I've kinda always wanted an Aquarius, but that seems high to me. Am I
wrong?
I left it on the shelf. Did pick up an Apple PowerMac AV card with
a pair of the mini-DIN-to-RCA input/output cables and a System 7.5
CD in the box - $5.
-ethan
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So I'm using the holiday pause to hopefully get my project to build an
interface for my Documation M200 card reader back on track.
I'm using an Apple ][ with a serial card and custom 6522 VIA card as a
parallel to serial converter. The 6522 has just enough inputs to read all
data and signal lines from the reader.
The documenation from the reader is online thanks to David Gesswein. It
has been very helpful, but proves to be too cryptic for this novice to be
able to build the connector. I have the ELCO connector almost all wired
up. The last step is to get the wiring between the cable and the 6522
VIA connector bridge that I've built.
The manual says the output is a "type 7404 TTL output" and a diagram in
the same shows some voltages and current draws that make no sense to me
and don't really facilitate an understanding (at least to this untrained
eye) of what to expect on the pins as data is read.
>From: Vintage Computer Festival <vcf(a)siconic.com>
>>From Section 5.4: Signal Characteristics:
>
>"The standard interface is supplied as the output of TTL type 7404.
>Signal sense is specified as a Logical TRUE and is a positive level;
>logical FALSE is a ground level. Circuit characteristics are shown in
>figure 5-2."
>
>This excerpt can be found on Page 46 at:
>
>http://www.pdp8.net/pdp8cgi/query_docs/tifftopdf.pl/pdp8docs/74226-300dpi.p…
>
>(warning: this server is a bit slow)
>
Seems fine from here :-). It's a mighty 486-133 (and meets the 10 year rule)
with a 384k DSL. Most of the documents have a link to a copy mirrired on
highgate which has better connectivity. I assume it was the speed of
downloading the documents you were commenting on.
>Figure 5-2 is approximately this:
>
> o Output Drive
> | TTL type 7416
> /
> \ I Logical True
> R / load Iload = -400 ua @ 2.4V min (with R=5.6K)
> \
> |
> +--------------->
> |
> /
> | I Logical False
>-----| sink Isink = 16 ma @ 0.4V max
> |
> \v
> |
> +---------------<
> |
> GND
>
>So I was told before that the way this works is that a signal will be
>output as "Logical True" voltage when the data is a '1' and a "Logical
>False" when the data is a '0'. But the way the connector is wired is
>confusing.
>
>Each of the 12 data lines (for reading the holes on the card) has 2 pins:
>the "data" pin and then the "data return" pin. See page 45 of the URL
>above.
>
The return is the ground reference.
>I imagine the data pin goes into one of my inputs on the 6522 (which
>handles TTL levels). However, I was told by Jim Willing that I should use
>an optoisolator in between the output of the reader and the 6522 because
>the output voltage is clamped mechanically(?)
>
It appears to be driven by a TTL Logic. Page 10-3 shows the output connector
which data lines go to the control card pg 10-20 and the returns go to the
DC return (power supply ground). From page 5-6 which you got the output
diagram from it says that twisted pair cable was recommended with the
returns terminated close as possible to the data receivers. Running
the grounds with the data lines in the twisted pair like that gave a little
more noise immunity. The control card parts list (PG 12-31) seems to have a
couple versions, normal TTL (7404), open collector outputs (7416) with pullups
or open collector with inverted data (7417).
>But where does the RET
>(return) pin go? To ground?
>
Ground it to the ground of your receiver card.
>Do I really need the optoisolators? Is the
>6522 robust enough to just take the raw signal from the reader output?
>
I wouldn't bother with the optoisolators and I don't think the PDP-8 card
did either. Anybody have a spare M843 CR8E card reader control
or schematics for it? Polling from an Apple ][ should be slow enough that
it won't see the glitches that are likely to happen on transisions of the
index mark signal. I frequently will read strobe signals like that until
I get the same value twice then act on it.
David Gesswein
http://www.pdp8.net/ -- Run an old computer with blinkenlights.
Have any PDP-8 stuff you're willing to part with?
I have the engineering prints in the LA 36 Decwriter II
LA36 (MPC5) sheet 5 of 8 shows 20 ma RECIEVE on J3 pin 7(+) and Pin 3(-)
bridged by a 3.3 volt zener D4 746A feeding a 4N26 (E43) opto-isolator
which drives a MXAA05 (Q4) driver transitor which has its collector on J4
pin 2 "S.I." (serial in)
20 ma TRANSMIT is on J3 Pin 5(+) and Pin 2(-). These pins are bridged
by a 1N4004 diode D6. This diode also is parallel to the
emitter/collector of Q2, an A05. which is driven by another 4N26
opto-isolator (E47). S.O. is J4 pin 4. It is driven by a 7404 inverter
(E62)-(Input is 7404 pin 3 connected to the diode cathode of the
opto-isolator, output is 7404 pin 4, which connects directly to J4 pin 4,
"S.O." serial out)
Sincerely
Larry Truthan
In reply to:
Message: 29
Date: Thu, 26 Dec 2002 09:39:19 -0700
From: Kevin Handy <kth(a)srv.net>
To: cctalk(a)classiccmp.org
Subject: Re: DEC LA36
Glen,
Thanks for the reply.
The files on your ZIP archive do not want to load on my 16500A.
How did you create the archive?
When I look at the files with a HEX editor the seem to be in the
HP LIF format. I used the LIFUTIL.EXE to create a disk that my
analyzer can read but the files all appear to be corrupted.
Thanks,
Charles.
----- Original Message -----
From: "Glen S" <glenslick(a)hotmail.com>
To: <charles(a)socketcom.com>
Sent: Wednesday, December 25, 2002 10:04 PM
Subject: Re: Looking for HP 10342B Bus Preprocessor software
> Try the attached .zip file.
>
> -Glen
>
>
> >From: "Charles Ader" <charles(a)socketcom.com>
> >Reply-To: cctalk(a)classiccmp.org
> >To: <cctech(a)classiccmp.org>
> >Subject: Looking for HP 10342B Bus Preprocessor software
> >Date: Wed, 25 Dec 2002 21:42:30 -0800
> >
> >I am trying to find the software that is needed
> >for an HP 16500A logic analyzer to operate the
> >HP 10342B Bus Preprocessor.
> >
> >The HP16500A I am using has an 16510A analyzer
> >module. I just need the analyzer setup files and
> >inverse assembler.
> >
> >Thanks,
> >Charles Ader.
My local thrift store has (had?) a PCjr with parallel port sidecard on
the 24th. They were asking $12.50 for it. No keyboard, power brick, or
any other parts were visible. My guess is they had no idea what it was,
since they have a policy against selling computers.
It was there on the 24th, so it might still be there now. If anyone wants
it, I can pick it up for them.
-chris
<http://www.mythtech.net>
Don,
I am in Calgary and I have a newer LA36, but I am looking for another older
LA36 with a 20mA loop connection. You can contact me at 'iamvirtual at
hotmail dot com' (replace at with @, dot with .)
Thanks
Barry
Wow, there was a lot of interest in this item! It has now been claimed.
Happy holidays everyone,
John
-----Original Message-----
From: John Elsbree [mailto:john@elsbree.org]
Sent: Monday, December 23, 2002 4:36 PM
To: 'cctalk(a)classiccmp.org'
Subject: Free to a good home: DEC VT330
Free + shipping:
DEC VT330 monochrome graphics terminal. Excellent condition, in working
order.
Includes LK201 keyboard, VSXXX mouse, and 3 "preliminary draft" manuals:
- Installing and Using
- Programmer Reference Manual, Vol I: Text Programming
- Programmer Reference Manual, Vol II: Graphics Programming
This was a "field test" unit from the days when I was a beta site for
DEC.
Please reply off-list.
John
john(a)elsbree.org
I have them. I can send you a .zip file with them.
-Glen
>From: "Charles Ader" <charles(a)socketcom.com>
>Reply-To: cctalk(a)classiccmp.org
>To: <cctech(a)classiccmp.org>
>Subject: Looking for HP 10342B Bus Preprocessor software
>Date: Wed, 25 Dec 2002 21:42:30 -0800
>
>I am trying to find the software that is needed
>for an HP 16500A logic analyzer to operate the
>HP 10342B Bus Preprocessor.
>
>The HP16500A I am using has an 16510A analyzer
>module. I just need the analyzer setup files and
>inverse assembler.
>
>Thanks,
>Charles Ader.
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