If you go to epay and put in "intel development confidential" (minus the
quotes) you will get a glimpse into Intel's development methods. Looks
like bondout versions of their chips with everything on the chip run out
to pads for testing.
The seller is in Israel, where a lot of the design work is done for Intel.
Jim
I've fixed the short problem. It was my mistake. It wasn't a bug in
PCB (thank heaven) but PCB's short detection/highlighting code sent me
all over the place looking for it. I'm not sure if there's a better way
to handle that or not. Basically a component on the other side of the
board, an 0805 resistor, was supposed to have one of its pads connected
to 3.3V. Instead it was connected to GND. Tired eyes and a tough
deadline is what I blame. :)
For some details (which I actually started typing as I narrowed this
down, before I found the problem, so it'll read weird) see below.
Thank you, everyone, for your suggestions!
-Dave
I deleted the 3.3V and GND planes, and narrowed it down to an 0805
resistor. One of its pads is highlighted in orange.
If I delete that resistor, the short goes away. When I put it back
(by placing a fresh 0805 from the library and giving it the same refdes)
the short comes back.
One pad of the resistor is connected to GND. It goes nowhere near 3.3V.
I've deleted and redrawn the traces going to that resistor, checking
for the short after every move. I've narrowed it down to one of that
resistors pads; the one that gets highlighted in orange. That's the one
that connects to GND.
If I delete the trace that connects that pad to GND, the short goes
away. BUT!! I've delete the GND plane, and the via w/thermal that
connected that trace to that plane. It connected to another resistor's
pad, which was erroneously connected to the GND net, when it was
supposed to be connected to 3.3V.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
I want to bould my own PDP11 some day but in an other way as other people
here :-)
I want to build an Bit Slice CPU out of AM2901 Chips to emulate the
PDP11 CPU. As a prt of the design I'LL need some very fast Proms for the
microcode and I've found the AM27C291,TMS27C291 and CY7C291 Chips, they are
fast and big enough (2Kx8 and 25-35ns).
I'mm looking now for a data sheet from the CY7C291 that describes the
programming algorithm, getting a datasheet is easy on
http://www.datasheetarchive.com/ but there is this sentence in the text:
"Programming Information
Programming Support is available from Cypress as well as from a number of
third party software vendors. For detailed programming information,
including a listing of software packages, please see the PROM Programming
Information located at the end of this section. Programming algorithms can
be obtained from any Cypress repesentative."
Ok, so far so good.
I don't know of what end of which section I schould look for the
programming information, since I don't know from where the datasheet was
scanned from. I've contacted Cypress itself some time before..to make it
short: they failed.
The sold the entire Eprom bussines years agao (forgot to which company)
but wheter cypress nor the new company has the required information or want
to share them.
So please: Maybe someone has this old databook from cypress and could look
"at the end of this section"?
I got the algorithm for the TMS in a datasheet, but according the german
company "Conitec" that makes programmers (have a GALEP-III from them) that
seems to be not the same on the CY7C291. The guy there couldn't program my
samples I've sent to him.
Any help?
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
On a whim, I installed OS/2 2.1 on a P1 system last night (Hint: it
helps to have a multi-boot setup with a network-capable OS on one
partition--saves a lot of floppy work).
I could get MS Lanman for OS/2 working okay, but then I ran into a
problem--it seems that FreeTCP and most browsers for OS/2 say "Warp 3
or later". And getting a browser-suitable TCP/IP stack seems to be
no small issue. IBM Web explorer seems to want Warp as well.
Lanman has a TCP/IP stack of sorts, but it's undocumented and
apparently used only for NetBEUI protocol. The only TCP/IP program
that uses it seems to be the "ping" packaged with Lanman.
Has anyone ever gotten a browser to work on 2.1 over an ethernet
TCP/IP connection? If so, how?
Thanks,
Chuck
I've just picked up a device named "MS2200 Memory Tester" made by
MOSAID. It came with abox called "M22110" to connect the RAM chip under
test (I guess).
It seems functional. Using the front panel, I can run tests and even get
a sort of raster image on a scope in X-Y mode.
But I have no clue how to connect a RAM chip. I can't find any docs at
all. Anyone knows anything about this thing?
Thanks,
Wim.
Does anybody have a copy of the PDP-11 Basic V01B-02 distribution tapes for
RT-11 v2C?
There should be 2 DecTapes (TU-56). My understanding is that the tapes
should be labelled:
DEC-11-LBACA-C-UC1
DEC-11-LBACA-C-UC2
There is a copy of the first tape on Bitsavers (
http://www.bitsavers.org/bits/DEC/pdp11/dectape/BS/basv1b.dta) which does
include a runnable copy of Basic, but I would like to rebuild the system.
The source portions (BASICL.MAC, and BASICH.MAC) are not on the tape.
Any assistance would be greatly appreciated.
--barrym
Well - I'm going to vote for Calculator - though I learned to program on
one of these back in the early 70s. I wrote a couple of simulators for
them to learn Fortran - and still remember a few details.
1) The machine had a total of 120 instructions if you used up the upper
registers with instructions (so it WAS possible to carefully do self
modifying code if you were so daring.)
2) When you used needed those registers - it would be 60 instructions.
The machine was very useful as a training vehicle for preparation to run
into things like the Altair with 256 bytes, etc. I look upon the P101
with a lot of fondness!
Steve
Bl@@dy ebay sellers...
I bid on, and won, a Tandata TD4000, complete with what looks like a
matching branded monitor. Cost me the grand sum of 99 pence - nobody
else wanted it.
Called yesterday to arrange collection, got "oh, we got it out for you
and it looks like it was broken when we moved house".
How broken? "a crack, and there's a cable missing."
told them no worries, would still have it, should be able to fix it.
"but my husband has put it out to be thrown away". Told her to go
check if it was still about, I did still want it!
Got a call back today, "it was put with some old PCs and they've all
been taken away this morning.."
Would they have done the same if it had been an iPad? Or it it had
sold for more than a pittance? I'd certainly have paid more!
The problem is, old == worthless, and if it's worthless (reinforced by
it selling for almost nothing, even though that's all they asked for)
then it doesn't matter.
OK, it's not like it was a set of backup discs from Prestel itself,
just a terminal to access it, but it's still galling. (The other, I'd
drive to the other end of the country to kick down their door if I
thought it would put me on the trail of them!)
Sigh.. Anyway rant over. Wonder if I can justify leaving them a Neg...
