I recently came into possession of about half a dozen of the Digital
Ethernet Local Network Interconnect (DELNI). This is about 4 more than I
need. I am willing to trade them singularly for something anyone has that
can peek my interest. I am particularly interested in items that is
associated DEC, HP and IBM workstation
Headley
=====================================================================
PH: 302-798-1930
Fax: 302-798-0243
Mobile: 302-983-4293
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
>> the add-on A-400 oscillator, used to tune your Moog back up as it
drifted
>> off pitch, which they all did more or less constantly. The
documentation
>> mentions retaining this feature even though the emulation no longer
>> drifts.
>>
>> But: why not? Shouldn't it drift, actually?
>
>Hmm... This is a difficult problem.
It was extreamly annoying trying to cut a track and keep pitch over time.
>But as regards undesirable behaviour (computers that suffer from logic
>problems in the design, synthesisers that drift), well, IMHO the
>simulator should be _able_ to exhibit that behaviour as well. A
processor
>designed with a race hazard so that 1 cycle in 10^11 (or so) it does the
>wrong thing should be emulated as having that problem. Maybe there
should
>be an option to turn it off (on the emulator) though.
The bset examples is the 8085 and z80 undocumented instructions that
all the vendors faithfully reproduced for that exact reason.
>It's not going to be trivial to implement that. Not only do you have to
>be able to emulate the machine when some components aren't working
>properly (how many people know what (say) a PDP8/e would do if a given
>gate was stuck at 0 or stuck at 1, what would happen if one input on a
>multi-input gate stopped working), you also have to allow for idiots
like
>me who want to 'cut tracks', inject arbitrary signals, etc. Are you
going
>to allow me to 'desolder' components and test them separately. I am
>thinking about gates that 'go slow' -- I've had 74S TTL that tests fine
>at slow speeds (switches and LEDs on a breadboard) but which fails when
>run at full speed. This sort of fault is painful to find because often
>the machine works correctly when single-stepped as well.
Yes emulating N^X error states is not a lot of fun for something as
simple as
PDP-8 and it gets worse for more complex systems.
Not many would want that save for those training in repair methods.
Allison
From: Will Jennings <xds_sigma7(a)hotmail.com>
>said hardware in operation... From the Ubergeek perspective, then yes,
I'd
>think you want the emulator to be weird like the real hardware, though
it
>could be good to have a less flaky version for those who are merely
curious
>and have never experienced the real hardware... On the other hand, if
you're
They important item is to be sure the said oddity is really real or some
side effect of age, errors in assembly or just bad programming.
I also agree with Will, introducing errors is not a desired case. Most
floppies actually worked with reasonable reliability.
Allison
From: jeff.kaneko(a)juno.com <jeff.kaneko(a)juno.com>
>
>Anybody want some rd-51's? They're the real
>McCoys, blessed and badged by DEC. They even
>come with sleds.
10mb for those that don't know. Also the sleds are handy
for those needed to mount a drive in many of the DEC cases.
Allison
>Many years ago, a company I used to work for did a
>Centronics port for TURBOchannel. The timing we wound
>up using was data stable 500nS before strobe, strobe
>lasts 1mS, data remains stable until 500nS after
>strobe. IIRC, this is fairly close to what we found
>in Centronics documentation, but I don't remember
>what documents we found or what the exact numbers
>in that document were.
I'm sorry; I had a bit of a brain fart. The strobe
lasts for one microsecond, not one millisecond.
--
Roger Ivie
rivie(a)teraglobal.com
Not speaking for TeraGlobal Communications Corporation
I recently acquired an Atari 1040f from a friend. It came with the SC1224
color monitor which, for some reason gives off a really awful high pitched
sound. Does anyone have some idea why this might happen? It scares my cat.
Thanks.
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Hello all,
I have 19 spare Hitachi HD46505 CRT controller chips that I'd like to offer
to the list members for free (you don't even have to pay postage). These
chips are UNTESTED, so I make no guarantees... I believe, from looking at
datasheets, that these are either a drop-in for, or very similar to, the
6845 CRT chip (the pinout is the same, and two of these are even marked with
both the HD46505 and 6845P markings). However, I could be wrong, so caveat
emptor...
In order to be fair to all list members who might be interested, there are
some rules....
- I will take off-list, emailed requests until Midnight, Jan 10, 2001 (US
Eastern time).
- You can request as many of the chips as you want, but depending on
interest, you may only get one or two.
- If more than 19 people respond, I will draw emails at random to give the
chips out.
I am willing to ship anywhere in the world that the US Postal Service allows
me to ship the chips. Again, totally free...
No, this is not some advertising scheme, and no, I am not harvesting any
information from this. I have received a lot of help from list members in
the past, and since I haven't been able to answer many questions on the
list, this is my form of repayment...
Thanks!
Rich B.
So, I guess I'll have to add sound (and smell?) to my Wang minicomputer
emulator to emulate the failure mode of the hard disk drive....
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I have a box in a nice well padded soft-case called a Compu-Voxx.
It was manufactured by Manutronics. It has a removable antenna.
It appears to be some sort of transmitting device for sending
messages. Based on the instructions on the face you record a
message (to a chip I imagine) and then send if the selectable
digital readout frequency is between 88.1 and 107.9.
That sounds like the AM band to me. Could this be some sort of
civil defense emergency device ?
It has a 5-pin DIN plug for power which unfortunately didn't come
with it which is not an unsurmountable problem.
Anyone know what this might be.
ciao larry
Reply to:
lgwalker(a)look.ca
