Hey!
We have two main problems:
1) The RUN button
The RUN button crashes the CPU. So does a RUN invoked by the end of
Paper-Tape End-Of-Tape.
When I stop the CP and CONTINUE, the processor just goes between FETCH and
EXECUTE states on one single instruction.
I made a 9-step JMP program, which I toggled in. I EXAMINEd 0 and
CONTINUEd from 1 which contained a JMP to 0 which jumped to 7, and from
there it went to 70, 700, 707, 770, 777, to 0.
By holding the CONTINUE button, it ran at least 1000 cycles at max speed.
2) IOT Instructions (Input-Output Transfer)
Just plain don't work.
When I READ-IN a Paper-Tape, The Memory Address increments, starting when
the data does. During this process, Memory Buffer = MA.
When the EOT is reached on the Paper-Tape Reader, RUN is invoked (Which
crashes the CP, see section 1)
These are sure signs of communication going on between the CP and the PTR.
Unless, the EOT has some sort of more direct connection.
Not even the Status lights illuminate. They seem to be wired into the IO
rack (which makes sense as most of what it monitors is I/O equipment..
TTY, PTR, PT-Punch etc.
Any help from any DECies greatly appreciated! I have many spares, and if I
don't have the spare in question, I know many who do.
Regards
Tore S Bekkedal
toresbe(a)ifi.uio.no
+47 91 85 95 08 <GMT+1!
The motor is 50Hz. Yes, you'd think the motor would be 235v, but it seems
not.
The 235-115v converter makes the stand go "DONG" when you plug it in and
makes a loud 50Hz hum.
Who needs a beatbox? Plug the TTY in, put scotch tape on the BREAK key and
you have a 600 BPM drummer ;)
Hi Dwight,
I've been looking for examples/labs that would take me through the correct
procedure to setup/operate a GP-10 analog computer. I found your email in a
discussion about the GP-6 along with links to two labs on how to use it. They
seem pretty good except for a few details that probably apply specifically to
the GP-6.
Thanks,
Matt
Matthew Wadham-Gagnon
McGill University, Montreal
Mechanical Engineering, Honours
I saw that in December of 2002 you had all four Xerox System Disks
for the 630 Memorywriter. Do you still have same? How much?
Bill Morton
5412 South Glendora
Spokane, WA 99223
Hi Dwight,
I've been looking for examples/labs that would take me through the correct
procedure to setup/operate a GP-10 analog computer. I found your email in a
discussion about the GP-6 along with links to two labs on how to use it. They
seem pretty good except for a few details that probably apply specifically to
the GP-6.
Thanks,
Matt
Matthew Wadham-Gagnon
McGill University, Montreal
Mechanical Engineering, Honours
> --- jamesd <jdickens(a)ameritech.net> wrote:
> > Hi new to list... just won a SUN 4/690mp...
> >
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3027472460&category=1121…
>
> Wahoo!
Not quite my reaction after looking at what he got, mine is OUCH! My
advice, ask the seller how much he'll charge you to keep it. Do you realize
how big and HEAVY that stuff is?!?! OTOH, if you did realize what you were
bidding on, congrantulations, you got it for a killer price :^)
What can I say, big Unix boxes for hobbyist use scare me, I'd much rather
have a nice small modernish 2-4 processor Unix workstation.
Zane
Hi, all..
( Gee, I get to ask a legitimate classic comp question.. )
Anyways, I've a A2GS sitting here, that I've been beating myself over
the head with for about two days now.. (Yes, I'm stubborn)
I've been trying to get ADT (serial) working between the GS, and my PC.
I've gotten it to work just fine PC -> GS. (I even had my PC type a
copy of Dos3.3/ADT/ADTgs in via the serial port at 300baud.)
Anyways the stumper is in the GS -> PC direction. Nothing works. I've
tried the modem port on the GS, as well as 2 different super serial
cards.
I finally got desperate enough to pull out a RS-232 break out box, and a
scope. (Plus a couple of dweebie basic programs) What I find is the
Apple serial communications looks like its running at about +/- 4v.
(This is on the builtin modem port. I can't get a SSC to work either.)
(The waveform also appears to have a fair amount of ring on the voltage
swings, but that may be normal)
I'm guessing that the +/-4volts isn't enough for my PC to recognize it.
Question #1:
Does anyone have any thoughts about my theory that the PSU is weak, or
suggestions where else to look?
Question #2:
Presuming question #1 is reasonable, schematics for a GS PSU?
Thanks,
David
Hello Jules,
> ZIF-socketed card ("unknown_04.jpg" on the website): The ZIF socket
> is a 28-pin unit. I'd say it was a programmer, but wouldn't it need
> an external 24V (??) supply if that were true?
Looks like the Vpp generator is on the far right below the multiturn
pot. It will be something like TL497.
> The 40-pin chip is marked as "S6821P", whatever one of those is.
68xx series paralell I/O chip.
> The first 3 of the switches are labelled as '16', the next 3
> as '32' and the last 4 (overlapping by 1 with the previous 3) as '64'.
First three on for 2716, next 3 on for 2732 and the last 4 on for 2764.
> Card with 8 LEDs and 4 empty 16-pin DIL sockets ("unknown_02.jpg" on the
> website): Any ideas?
Looks like a digital I/O card. The 6522s are also paralell I/O chips.
Leads to the outside world would plug into the DIL sockets.
Cheers,
Lee.
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I just aquired (won on ebay, totally forgot I bid on it), a pretty neat
little Apple item I never knew existed.
Its an RGB -> NTSC modulator for the Apple IIc. It also came with a
game/TV switch box, but I don't know if that was originally part of the
package, or just a seperate item that was included in the auction.
I've never seen this little device before, and had no idea it existed.
There doesn't seem to be too much about it online.
Has anyone else ever seen or used one of these? I'm just curous really as
there isn't much to know or learn about it. It looks like it will only
fit the IIc (it has a big lump on it that prevents it from installing on
anything else without a cable). And the device is pretty self explanitory
in how it works.
I was able to figure out from the part numbers and a little searching
that I believe this is the NTSC version. There is also a PAL version (any
others?).
This one appears to be almost brand new. There is zero discoloration and
other than slight scratches from screws on the leads to the TV/Game
switch box, there is no marring at all.
-chris
<http://www.mythtech.net>
I have come across what seems to be a remote outlet/power sequencer device
>from the Systems Enhancement Corporation called the Power Administrator 800.
On the rear it has two DB-9 male ports, which I assume can be used to program
this device. It also has an Ethernet port and a few RJ-11 ports labeled "IN",
"R1," and "R2." Additionally, a DB-15f port with the label "out" exists. I
have tried to connect to the device using 9600/8/N/1 over the two serial ports
(DB-9) using both a straight and null-modem cable, but my terminal emulator
senses nothing. A bank of 8 dip switches exists with the label "config." I
contacted the manufacturer, but they claim all of this information is archived
and they do not have access to it. Does anyone have any ideas on how to
communicate with this device? It powers on and supplies electricity to its
six receptacles.
Thanks,
Geoff
