On Fri, 14 Feb 2025 12:00:07 -0600
cctalk-request(a)classiccmp.org wrote:
> I can't believe people do use it any more without filtering. I've
> used an ad-blocking web browser for some years but I occasionally see
> the real thing when setting up a new machine. Absurd.
It really is astonishing how bad it's gotten - fully the equal of the
early '00s when sites might just spawn a dozen pop-ups and only one of
the major browsers let you block them, only now there's a pile of JS
mining crypto in the background, to boot :/ Been running with NoScript
and an ad-blocker as my standard configuration for many, many years
now, but it's always sobering to get a look at what other people see...
I am about to get a NCR EM-D2 card reader, but I can not find much
documentation on it.
Is there anyone here that has documentation on it? Preferably a maintenance
manual.
A couple of years ago (perhaps in February 2021 if one studies how
they indexed the file in their storage) there was a sale of a maintenance
manual on Ebay according to the below Worthpoint link.
https://www.worthpoint.com/worthopedia/1965-ncr-em-d2-punched-card-reader-3…
Did anyone here buy this manual? I am very interested in a scan of this
manual or possibly to purchase the manual.
/Mattis
Does anyone know anything about the whereabouts of Megan Gentry, former
RT-11 developer?
She left her last trace in 2020, when she ported ZEMU to RT-11.
We invite you to take part in a brief, anonymous survey about VCF Montreal.
Click here https://bit.ly/vcfm2026pre-en
Nous vous invitons à participer à un bref sondage anonyme sur VCF Montréal.
Cliquez ici https://bit.ly/vcfm2026pre-fr
Jeff Brace
Vintage Computer Federation Vice President
I'm repairing/restoring a later model MITS 8 inch floppy drive. I can not
seem to find schematics for it. It is
the same as Bill Degnan has here:
https://vintagecomputer.net/MITS/88-DCDD/
You can see in his photos (and mine match) that the _plus_ 24 volt DC supply
on the board uses a 7924 (note the
9. negative) voltage regulator, with a small heat sink, directly on the
circuit board. Along with a couple of 7805s,
there is a .Motorola 2n6045 screwed to the large black heat sink. All three
of the devices drop into sockets on the
circuit board to allow the heat sink to be easily installed/removed. On my
unit, the socket for the 2n6045 was burnt
to a crisp. I have replace the socket, the 2n6045, the 7924 and the
electrolytic caps. When I test the +24 volt rail
with a dummy load, it measures +41 volts.
I don't understand this circuit. I know MITS was notorious for its power
supplies. Does anyone have the schematics
for this version of the 8 inch floppy? Any suggestions?
Thanks,
Bill S.
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>Message: 26
>Date: Sat, 1 Feb 2025 18:13:17 -0500
>From: Nigel Johnson Ham <g4ajq1(a)gmail.com>
>Subject: [cctalk] Re: RS232 then and now
>
>On 2025-02-01 18:11, Chuck Guzis via cctalk wrote:
>> One mystery to me was why did the industry stick with the EIA-232 levels
>> for terminals and whatnot long after differential EIA-422 was
>> introduced. Higher-speed, better noise immunity, single-ended power
>> supply... Seems that the popular places were Appletalk and ST506 data
>> lines. But not on DTE/DCE. If you were using full-voltage (±15-±25)
>> at high speeds (>500Kbps), the slew rates were ridiculous.
>>
>> Inertia? My old 80286 motherboard had junper-selectable 232 or 422.
>>
>> Still have a couple of tubes of 422 drivers/receivers.
>>
>> --Chuck
>>
>DEC had RS422 available on their DLJ11J four-port interface, but I never
>saw it used in the field.
>
The Otrona Attache has two serial ports, DA-15 female, that are jumper selectable between RS-232C, RS-422 or RS-423.
Bob
