Since I know there's tons of PDP/11 geniuses here, and other gurus with a NOVA 4, and a Tektronix 4052 guy (I have the 4051):
What have you done, with microprogramming this part? In your architecture, have you changed the microcode, create an instruction to enhance your machine?
I would be interested in any hardware projects, stories (or even in the FPGA, I hear its a popular thing to copy);
I read all of Donnamaies pages, and planing to hook up, breadboard the eval kit, perhaps reproduce the PCB if you guys are interested.
What about the coding tools? ADASM? Looks long gone, how do you do microcode today?
If I forget the soldering iron, can anyone show me an example on a Xilinx board, ISE, Vivado that uses the original AMD 2900 architecture?
http://www.donnamaie.com/AMD_Vintage/AMD_2900_ED2900A.html
Donnamaie E. White - AMD 2900 Family, Bit-Slice; Am2900 ...<http://www.donnamaie.com/AMD_Vintage/AMD_2900_ED2900A.html>
www.donnamaie.com
Lecture Monograph updated. The AMD 2900 Family (Am2900) Bit-Slice and other devices were supported by a number of high-level application notes. (Generated by the AMD ...
> From: Steven Malikoff
> That's the first actual photo I've seen of the foot, and I see what you
> mean.
Oh, I can take more, then; let me know what you need.
> Let's regard the inner vertical surface where it mates to the rack as
> the normal surface.
Right; that's our reference plane.
> If you have a length of something straight .. clamp it with a .. clamp
> to that inner surface
Umm, not possible. There are two diagonal (in the horizontal plane) ribs
coming off that surface, so there's no way to clamp anything vertical to
it. The _front_ (outer) surface, parallel to the reference plane, I could get
to (and the clamp is a good idea). Here's what I wound up with:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/StabilizerMeasurement.jpg
(Yes, yes, I know, tha assumes the back face of the square is parallel to the
front; it is, pretty much - I checked with a vernier calipers.)
So the vertical distance from the horizontal plane at the bottom of the
stabilizer, at its tip, to the bottom of the 'outer surface' (as above), is
17/32". The distance from the plane of the 'outer surface' to the end of the
stabilizer is 7-9/16". The distance between the reference plane and the 'outer
surface' is 7.14mm (one thing I _could_ get a vernier calipers on :-).
Also, it turns out the right-hand vertical face of the stabilizer is _not_
perpendicular to the reference plane! The foot angles in slightly. The outer
vertical surface is a plane along its entire length, so it's hard to notice
unless you put a square on it directly:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/StabilizerAngled.jpg
(Sorry about the lens distortion; wanted to show that the square was along
the reference plane.)
I couldn't get anything clamped on to make the measurement, but the tip of
the stabilizer is about 1/2" (to a /32nd, or so) in from a vertical plane
perpendicular to the reference plane, and situated at the right-most location
on the foot (i.e. along the edge of the square, in that photo).
> A pencil rubbing on paper, or paper creasing slong eges then drawn over
> with a ruler can also help to get angled surfaces.
Sorry, couldn't figure that out?
> Another thing, CAD can make good use of non-perpendicular measurements.
> So if you're able to measure something across a diagonal or at some odd
> angle, then please do so. It can be used to triangulate and improve
> other taken measurements, like a point cloud.
What other measurements should I take?
One easy/obvious one is from the right-hand outer bottom corner of the
stabilizer to the left-hand bottom corner of the reference plane: that's
8-9/32". (A lot of these corners are rounded, so exact measurements are a
matter of choice....) The top inner corner of the right-hand face is 9-11/32"
>from the bottom outer corner of that face (same corner as above).
Noel
The subject line says it all?
I have just been given an IBM 5285 Distributed Data System, together with a
5222 printer. It appears to work (it came with an 8? disk that contains some
user application, and the system can IPL off that disk, and brings up a
prompt requesting the current date and time), but I have no keyboard with
it. This brochure
(http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/528x/G580-0274-00_5280
_Distributed_Data_System_Brochure.pdf) has a picture of the system and its
keyboard on the front page.
If anyone has one of these keyboards, please let me know!
Kind regards,
Camiel Vanderhoeven
Hi,
I now have a number of uCode diskettes for my IBM 4331. I would somehow like to image them so:
a) I have backups in case the floppies themselves go bad
b) be able to investigate their contents in case I have to ?merge? the contents of multiple floppies to
make a single good one
These are all 8? diskettes.
The complicating factors in all of this are:
a) any text (e.g. strings) are going to be in EBCDIC rather than ASCII
b) each uCode diskette was presumably serialized to the CPU it was for
c) not sure what the ?on-disk? structure looks like
d) the only 8? diskette drives that I have are in IBM (non-PC) equipment
Any ideas/comments would be welcome.
Thanks.
TTFN - Guy
Does anyone have an ADDS Envoy portable terminal, circa 1972-1976? If
so, then please let me know if what if any are the U.S. patent numbers
cited on it.
Thanks,
Evan
> From: Steven Malikoff
> Using the new bolt info, it's refined a little more:
I just took a quick glance at this, and noticed on major thing that's off:
you're showing the bottom side of the stabilizer foot as at right angles to
the vertical of the rack; it's not. See here:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/StabilizerFoot.jpg
in which I have attempted to place the ruler at a right angle to the vertical
(as available in the plate where the two horizontal bolts go through).
I _guess_ I could try and work out how to measure the amount of drop; maybe I
can get one side of a T-square onto that vertical (on the front), get a
horizontal from that, and start measuring...
> I'm assuming the plate goes on after the feet have been placed on the
> rack, and the #10 screws hold it all together.
There are two different kinds of kickplates:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/Kickplate.jpg
Both have to go on after the feet, since the bolts go through these, and then
through the feet, into the rack. The newer (I think) 'diagonal' ones don't
cover the top of the feet, so you can tighten the large vertical bolt after
the two smaller horizontal bolts. The latter are sort of necessary; there's
often some play in the stabilizer foot, even with the large vertical bolt
tightened.
(BTW: here:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/ExtensionFootBolt.jpg
is an image of one of those, which I posted a while back.)
> I'm guessing the kickplate is 16 guage sheetmetal..?
My vernier caliper says 1.66mm (including paint, of course); whatever that
turns into. Both types are the same.
Noel
Hello List,
i playing arround with my Vaxstation 4000 60....
This is a System with 40 MB Ram, 1GB Hdd, a VGA Monitor, LK201 Keyboard,
VSXXXAA.B03 Mouse, and a external SCSI-CDROm dirve.
With OpenVMS installed on it i have the grafical DecWindows System running.
Now i have installed NetBSD 7.1 from CD via the RS232 Consoleport.
My two problems now are:
1.) It is not posible to switch the console from RS232 to the VGA
Monitor and Keyboard. If i switch the S3 switch in down position i can
only see the NetBSD Kernel decompression. After that i see nothing on
VGA and RS232 console. The System starts up anyway. After some time it
is possible to connect via LAN.
2.) Is it posible to run the NetBSD X.Org on that sort of Vaxstation? If
yes... Whats to do to get that running? I Think i have to fix my point 1
first.
Marco Rauhut
I see a thread with the above title started by *MartinHepperle *concerning
the use of modern VGA flat panel displays with video from the 98204B
composite video board in the HP 9817 computer.
The problem is that the high horizontal scan rate of 25khz prevents modern
panels from locking onto the video. Mr. Hepperle mentions the possible use
of a scan converter available from that auction house, the Gonebes GBS-8200.
I write to report the successful use of this device with an HP 2009m
VGA-only flat panel monitor and the subject video board and computer. I
input the video to the "Y" input of the YPbPr inputs of the device.
I hope someone finds this useful.
Photo of converter: http://bit.ly/2qEnHV0
Resulting video: http://bit.ly/2ACPLrM
--
Cliff Miller
cliff52 at gmail.com
I see a thread with the above title started by *MartinHepperle *concerning
the use of modern VGA flat panel displays with video from the 98204B
composite video board in the HP 9817 computer.
The problem is that the high horizontal scan rate of 25khz prevents modern
panels from locking onto the video. Mr. Hepperle mentions the possible use
of a scan converter available from that auction house, the Gonebes GBS-8200.
I write to report the successful use of this device with an HP 2009m
VGA-only flat panel monitor and the subject video board and computer. I
input the video to the "Y" input of the YPbPr inputs of the device.
I hope someone finds this useful.
Photo of converter: http://bit.ly/2qEnHV0
Resulting video: http://bit.ly/2ACPLrM
--
Cliff Miller
cliff52 at gmail.com
