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</head><body text="#000000">Have a good time on vacation, Mark.<br>
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<span>Mark Emmer wrote on 2/13/20 6:49 AM:</span><br>
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<div dir="auto">Any good simulation would have to include the
semi-real I/O instructions RCC (Read and Chew Card) and DPD (Drop and
Pie Deck).<br><br></div>
<div dir="auto">I'm with you about never again struggling to remove a
card from the read gate that had been converted to a mini-accordion or
measuring the size of a progrram in boxes, not bytes.<br><br></div>
<div dir="auto">I'm traveling for several weeks, but when back home I
will assist Ken in getting an SDS driver for the reader/punch if he
hasn't completed the task by then. All needed documentation is in the
940 Reference Manual.<br><br></div>
<div dir="auto">I wonder if anyone has sound recordings of a
reader/punch? That would be a nice addition to a blinkenlights
implementation, which is on my To Do list.<br><br></div>
<div dir="auto">Mark<br><br><br><br></div>
<div dir="auto"><!-- tmjah_g_1299s -->Get <!-- tmjah_g_1299e --><!-- tmjah_g_1299s --><a
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<div class="gmail_quote">On Feb 13, 2020, at 6:51 AM, Bob Supnik <<a
href="mailto:bob@supnik.org" target="_blank" moz-do-not-send="true">bob@supnik.org</a>>
wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex;
border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><pre class="blue">1. I can confirm that RT11 V5.3 INIT does not work properly with an RL02
in 3.10.
My next step is to trace back changes, because I think it used to work.
2. There's no card reader for the SDS 940 because
a) I hate card readers (from having used them way back when)
b) I thought there wouldn't be any demand
Rich Cornwell's library should make it easier to implement a card reader
these days.
My first card reader story goes back to an RCA Spectra 70 I used in 1965.
It had a vacuum pick reader for high speed operation. The reader would
gradually curl the front edge of the cards, so that after two or three
passes, the deck was unreadable. It's failure mode was to spit cards out,
past the receive hopper, at very high velocity and scatter them ten or
fifteen feet out on the floor...
The second was a very slow mechanical reader on a PDP-7 in 1966. The
only other keyboard device was a Teletype, so initial entry of programs
was done from punched cards. It read, allegedly, 100 cards per minute
using mechanical fingers with little star wheels on the end. DEC field
service was in almost every week tuning or fixing the damned thing so
that it could actually handle a decent-sized deck.
In my experience, only IBM built decent card readers. The reader/punch
on the 1620 (I used one in 1964) was very sturdy, and the 407 (used for
offline printing of punched card output) could read almost anything.
/Bob
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