Hello I am a student at SJSU in CA and I am wanting to construct a
talking DVM senior project. Part of the speech circuit would be using
the the DT1050 kit by National semiconductor(MM54104 +ROMS for the
digitalker). Do you know of any anywhere? If so,let me know....
Thanks
Paul
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Thank you
Phillipe,
I am working on a project that will allow me to test many/most of
my flip chips as you did. I got the idea from seeing what you did
on your web site. I am hoping mine is not quite as bad off as
the one you fixed. It was fully functional, and still partially
is. My main problem right now is I have no memory access. I hope
as have as much luck as you did. I like my 8i system, as it's what
I originally learned on and finally got one of my own.
Tim R
--- On Wed 03/01, Philippe Sonnet < sonnet at sols.ucl.ac.be > wrote:
From: Philippe Sonnet [mailto: sonnet at sols.ucl.ac.be]
To: cctech at classiccmp.org
Date: Wed, 1 Mar 2006 23:10:57 +0100
Subject: Re: My pdp-8i problem
Dear Tim,It is very hard to answer your question. I also spent hours fixing my pdp-8/L, in which almost all circuits had to be repaired. It took me two years. The only way : use a logic probe and have a set a spare flipchips which you know are OK. I created a system to test the flipchips using a digital acquisition card on a PC (see www.sonnet.be). Collect all possible schematics, study them, have a confortable seat, stay calm and systematic and use a card extender to have better access to all the lines. Good luck,Philippe
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>From: "John C. Ellingboe" <john at guntersville.net>
>
>Chuck Guzis wrote:
>>
>> On 3/1/2006 at 3:07 PM John C. Ellingboe wrote:
>>
>> >Does anyone have information on the TI Travelmate LT220/V. A
>> >quick Google didn't turn up anything of value.
>> >
>> >I have acquired one with a pile of other items and have no idea
>> >how useful it might be. The power source, 18V DC did not come
>> >with it and there is no indication as to whether the center pin
>> >of the power connector is the positive connection or not.
>>
>> Any external I/O connectors on it? Things like parallel port connections
>> will usually have their ground/return pins conected to the - side of the
>> power supply.
>>
>> Last resort is popping the box open and checking the ground plane on the
>> PCB or any of the ICs (if the ground plane is buried) against the
>> connector.
>>
>> Cheers,
>> Chuck
>
>I haven't opened it up yet but there is a 9 pin jack on the
>side, maybe a serial port. It also has a modular connector
>which may be a modem connection. The other side has a large
>connector behind a hinged cover that looks like it may be a bus
>connection for expantion or connection to some special
>equipment.
>
>John
Hi John
The point is that it is unlikely that the 18 volts will
go to one of these connectors but the ground lead will
most likely be there and Ohm at zero Ohms between connectors.
The other 18 volt lead will most likely be the positive.
Dwight
the talk of a peculiar USR pc made me remember this.
There used to be a (primarily) electronic junk store
in LI called Eldies (Edlies?) on Hempstead Tnpk in
Levittown I guess. Sitting there one day was an all in
one, IIRC, NCR unit that booted up to an a:> prompt.
It struck me as a weirdish dos semi compatible. It
didnt strike me as a PC4 or the nearly identical
Decision Mate (cpm). Pretty sure it was NCR, but eh
maybe it was NEC (definately NOT an APC, not quite
that big and heavy). Anyone have a clue?
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Hi Mr. Hoke,
I saw your posting on the web about installing an old 5 1/4'' Floppy on a
new PC.
I got the same floppy ( TEAC FD-55GFR ) and would like to know whether you
succeeded in the end, and how you jumpered your drive. I get an E/A-Error
message from WindowsXP whenever I try to click on the drive in the Explorer ...
but XP at least recognizes it as 5 1/4''-floppy.
Regards.
Alexey.
Hi - I am trying to install a Teac FD-55GFR 5 1/4" drive into a Pentium 200
mhz computer. Upon trying to read the drive I get a "General Failure Trying To
Read Drive A" error message. I have the drive connected to the end of the
ribbon cable, and the drive is designated as drive A. Also, I noticed that
there are some switches (I forgot what they are called - upright posts where you
couple a pair together using a U-shaped something or another) on the bottom of
the drive. How should these switches be set? Also, could my problem be that I
am not using a correct BIOS?
Thanks for all of your help.
I was hoping someone on this list might have some input on this. I have also posted this to alt.sys.pdp8. I have a pdp-8i with a memory problem. Here is the post from alt.sys.pdp8:
Quite some time back while scoping out a problem I shorted a pin in my
8i backplane and lost memory control. Since that time Vince and I have been trying to figure out where the problem is to fix it. I don't know what pin I shorted as at the time I did not realize
I had damaged anything. The +5v breaker tripped though.
The problem is I can not deposit or read back any memory locations.
The MB is displayed correctly on a deposit. Scoping signal has shown me a very odd signal on B FIELD 0 (1) when the machine is in run mode. It has a wave form on it rather than just a normal
voltage. The oddest thing is the high point of the wave goes up to +6v with a bit of the beginning of the top portion going above +6v. To me this should not be. How can I get
+6v from a system that is using +5v as it's input voltage? We have
some theories but nothing concrete as yet. The other thing is if I remove all 3 G228s (A36, B36, B37) the
signal goes away. I do not have parity memory so nothing is in A37.
We believe there is a bad ground somewhere, but I have not been able to determine where. I do not have a wiring list so I may have to trace some signals manually. I think I have to find all the places the B30L1 (B FIELD 0(1)) goes to.
Any ideas or suggestions from anyone? This has been bugging me for a
long time. I look at it for awhile, and then put it down for awhile. It's also not easy to look at this in the location it is in. It's too low to kneel and really be comfortable. Too high to lay on my stomach. :)
Thanks for any input on this. I should say that part of the system
still works. Examining or depositing memory while it does not appear to load/store the data increments the PC
as it should. I can sort of run, which was my original problem. It
runs but stays at location zero. It is not an interrupt causing this. So the front panel is mostly operational
so at least some of the machine is still working. I just have to find
the problem with the memory.
I know most people on this list do not have a pdp-8i, nor may know
much if anything about them. Any suggestion will be taken and looked
into if it seems to have hope of leading to a solution. Also I will
answer any questions people have to help describe the problem more or
give more details into what Vince and I have looked at.
Tim Radde
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Can anyone help this guy?
>From: Gary E Kaufman <gkaufman at the-planet.org>
>Subject: Computime S-100 card docs?
>
>A long shot - I found your old message on classiccmp.org. Any chance you
>located docs for the Computime UFDC-1? I have two of the boards but have
>lost the docs.
>
>Many thanks!
>
>- Gary
>
>
Discovered on the new "Google Video" tapings of the Computer History
Museum Meetings, like "An evening with Steve Wozniak" Jan 12, 2006.
For more search Google Videos for Computer History Museum.
Some good National Historical Archive stuff too.... like the moon landing.
Found under google picks. Plays fine on my Ubuntu Linux box, too.
--
Paxton Hoag
Astoria, OR
USA
Greetings,
I have a pair of DECstations and related parts that I don't forsee
doing anything with in the near (or distant) future:
* Complete DECstation 5000/133 with display, mouse and keyboard that powers
up but has no OS.
* DECstation 2100 system unit only. Unknown condition.
* Storage expansion unit with one hard drive
* Three other DIGITAL mice NIB (maybe for the 2100)
* Another DA-15 to keyboard/mouse cable for the 5000
* Ethernet tranceiver
Photos can be found at:
http://popcorn.cx/computers/digital/decstation2100/http://popcorn.cx/computers/digital/decstation5000/
Pickup is from Glen Waverley, preferably early evening later in the week.
I hope someone else can get better use out of them than I have.
Thanks,
Stephen
Update to the previous update which was an update as well: David said that
after his speech, he'll auction an original copy of the first edition of
"Basic Computer Games" and also the first 12 issues of "Creative Computing"
magazine, with the money going to charity.
-----------------------------------------
Evan Koblentz's personal homepage: http://www.snarc.net
Computer Collector Newsletter:
>> http://news.computercollector.com
Mid-Atlantic Retro Computing Hobbyists & Museum:
>> http://www.marchclub.org
>> http://groups.yahoo.com/group/midatlanticretro/
