Hello,
I always have been amazed by the complexity and peculiarity of
fixed/removable hybrid discs like DEC RC25 and CDC 9457.
Looking at some specifications found on the web, these drives look quite
similar each other, even if these are completely different on an exterior /
interface point of view...
Maybe there's some compatibility between the two products?
Thanks
Andrea
I am clearing out a storage space and will be offering up some of the old systems and miscellaneous peripherals currently stored there as I clear and sort things.? To start with I have the following available. If anyone is interested or knows where else to offer the various items contact me off list.? If I can't find anyone interested I'll probably just send things on to recycle as I need to clear and close the space.
All of the following are base units, no keyboards or other external peripherals although I suspect there may be keyboards somewhere in the storage space but can't guarantee it. If I do find some I can pass them along with the units if interested.
1) Macintosh SE/30 - Appears to have some expansion card of some sort inside with with a 15 pin connector and what I think was a BNC connector?
2) Macintosh SE/30 - Has a ribbon cable coming out the expansion slot in the back but no idea what it connects to inside or anything else about it.3) Macintosh Plus 1Mb - This sounds like there might be something loose inside if you turn it over.
All systems are in unknown state and unopened so I have no idea what is inside or what condition they may be in. Systems are located in Houston, TX.
Contact me off list if you need any more info or interest in these systems.
Thanks.
David Williamswww.trailingedge.com
Hi,
I think that I need to re-cap the power supply in a Rainbow 100. Does
anyone here know if anyone has put together a list of capacitors used in
the power supply that I can use to order parts?
alan
Since I'm going to be out in Seattle for a week to participate in VCF/PNW,
I was wondering if anyone in the area could lend me a hand with help
reading in an old QIC-24 25MB tape cartridge or two?
One has the TurboDOS backup/install media for a Televideo TS-816 that I got
>from Don Maslin back in the day. I think the other one is related too, but
it was unmarked.
I would like to at least try to get images off of them. At least one of
them has a working belt.. the other ones fell apart when i tried removing
the belt to reform it.
Thank,
Patrick Finnegan
This may or may not be new or useful to anyone here, but I came across this website by accident today. They have a considerable selection of rather hard to find parts for old home computers, game consoles, and even arcade machines. Figured I would send along the link.
http://www.arcadecomponents.com/index.html
"He may look dumb but that's just a disguise."? -- Charlie Daniels
"The names of global variables should start with? ? // "? --?https://isocpp.org
I have several PDP-11's in my collection (among other things), and not
enough PC05 tape readers (or enough room) to go around. But most if not
all of my machines have M7810 PC11 interfaces, and I have one I could
move from machine to machine as needed. Moving a PC05 around would be a
lot more work, and not every rack has room. ;)
So, I took a look at what it might take to interface with an M7810 (or,
down the road, a PDP-8/L or PDP-12. It looks like the emulator would
have to accept as input just 3 lines (Initialize L, IOP2(1)/Select,
IOP4(1)/Read) [It would not need the redundant Initialize H, IOP1(1),
Qualify or Skip], and would have to drive 11 lines into the pullups on
the M7810 (8 Data lines, IO Bus INT L/Reader Done L, Outtape/Error and
RDR RUN L/RDR Busy L).
So, a total of 14 interface lines. (The 8 or 12 would take a few more
lines).
The pullups average about 470 ohms (1 is 1K, 1 is 220, the rest are
470), so at 5V the output has to sink a bit over 10ma, and all total
120ma.
An Arduino Uno with an Ethernet shield would have 20 minus 5 lines
available, in theory, but if one wants serial I/O as well for debugging,
that sucks up 2 more lines - so only 13 available. And sinking 120ma
would be a bit much though I could likely sprinkle inputs among the
outputs to make it work so as to stay within the recommended sink
limits, and at least initially have it never run out of tape, and tie
Error down.
http://playground.arduino.cc/Main/ArduinoPinCurrentLimitations
So, I am thinking about an Arduino Mega, as it has more output groupings
to sprinkle the sink current around, and 5V interface capability, and
more pins to eventually support my PDP-8/L and PDP-12.
(I could do it with a PIC - did that for a Documation card reader to PC
interface, but I am really tired of fighting Microchip's IDE.)
BUT - it also occurs to me someone may have already done something like
this? Any leads / ideas?
JRJ
>Date: Sun, 10 Mar 2019 17:18:26 -0400
>From: Murray McCullough <c.murray.mccullough at gmail.com>
>Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas
>Instruments
Merryman died on February 27.
>From the New York Times (March 7, 2019):
Jerry Merryman, Co-Inventor of the Pocket Calculator, Dies at 86
https://www.nytimes.com/2019/03/07/obituaries/jerry-merryman-dead.html
Bob
> From: Brent Hilpert
>>> Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas
>>> Instruments created an integrated circuit designed to replace the
>>> calulator. Historians, though not all, credit this development as the
>>> beginning of the electronic-computing revolution that was truly underway
>>> by the mid-70s.
>> Scotty, more power to the Reality Distortion Field!
> It's not an out-to-lunch suggestion.
> The digital pocket calculator was the first mass-market digital electronic
> device to be put in the hands of the consumer.
It's not clear which element of the original post that Al was referring to; I
saw several things I might disagree with:
- Unless you look at the date carefully, the notion that TI's work developing
chips was intended to replace the calculator.
- The notion that it was calculators that drove the development of micros;
Intel had actually started work on a micro for Datapoint, which was
eventually released as the 8008, _before_ they started on the 4004 for
Busicom.
I'd have to think long and hard before I rendered a judgement on how
important digital pocket calculators were to where we are today.
My initial reaction is to say 'not very', though - early personal computers,
centered on Silicon Valley, were mostly driven by having, well, a personal
computer. It's not clear that widespread ownership of personal calculators
did anything to drive that.
Noel
Does anyone have schematic for a Trio Labs PSU made in 1975
https://i.imgur.com/MTwcpRA.jpg
It is a primary side switcher made in 1975 outputting 100 Amps 5Volt.
Quite early for being primary switcher I would guess.
I used to work at UBC in Pharmacology in the
1980's and had a few talks with Bill Webb about
Unix but, unfortunately, for the data acquisition
we were doing Unix was far too slow and I did
everything in optimized PDP-11 assembler. Of
course, we didn't have a PDP-11/45 like Bill had
and had to make do with a slower PDP-11/34. Bill
had hacked Unix considerably and it was locally
known as Webbix on campus. Played around with
Unix and Webbix back then but don't think I have the tapes anymore.
One of the RL01 or RLO2 disks I picked up at SERF
in the 1990's (along with a MINC system)
contained a copy of Webbix but I'm not sure I
copied it. Gave away the MINC and 2 RLO1 or RLO2
drives to a guy in Seattle about 2006 and hopefully he's copied them.
Boris Gimbarzevsky
>I recovered several pieces of Unix media ? all
>of whichh I think made it into TUHS/PUPS
>collection - at UBC in the mid-1990???s while I was working at TRIUMF.
>
>Those Unix disks and tapes came from a SERF sale
>(Surplus Equipment Recycling Facility) on UBC
>main campus, not from TRIUMF. Bill Webb was a
>common thread for Unix use in the biology department at UBC.
>
>TRIUMF extensively used Data General Nova, then
>Eclipse (both 16 and 32 bit), computers from
>opening through the 1990???s for both cyclotron
>control systems and data acquisition for
>experiments. They also had a fair number of
>PDP-11???s and VAXen running RSX-11, RT-11, and
>VMS. I myself had an Alpha workstation on my
>desk for the two users I was at TRIUMF.
>
>One of my favorite connections between TRIUMF
>and UBC, was the underground pneumatic tube used
>to rapidly carry short lived isotopes produced
>in the cyclotron to the main campus for biology
>and medical uses. It should not come as a
>surprise to anyone that I still work in moving
>things and people through underground tunnels ????
>
>Tim N3QE
