Certainly, there are a lot of logic analyzsers (or
analysers, if you are English) floating around. I was
told by a guy who specializes in "refurbished" (i.e.
dusted off) test equipment that this is because a lot
of it is gov't surplus where they just grab the unit.
He also mentioned that a lot of university surplus has
partially blown pods because of carelessness - due to
the nature of what they do, not much protection on the
inputs.
I have a Tek 1230 which I was lucky enough to get some
pods with. I had another one w/o pods and GOOD LUCK on
getting schematics, etc on this stuff - it's a "black
art" proprietary sort of thing.
=====
-Steve Loboyko
Incredible wisdom actually found in a commerical fortune cookie:
"When small men cast long shadows, then it is very late in the day."
Website: http://juliepalooza.8m.com/sl
__________________________________
Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing.
http://photos.yahoo.com/
Was surfing the web when I came across this documentary on ARPAnet -
features some of the founders, including Davies, Licklider, Heart, and
Khan.
http://xrl.us/kg7y is a redirect to the download - it's on Google Video
- this is an AVI file.
Cute sightings include a PDP-10, and several seconds of a PDP-10 doing
what appears to be a host list dump, with machines like MIT-AI and
MIT-MULTICS appearing. If it was alphabetical, and all-inclusive, this
documentary was made before 1973, as the NORSAR TIP wasn't on the list.
-toresbe :)
I revived an old 6Mhz PC AT today by removing the original Western Digital based
hard disk controller and replacing it with a newer, generic IDE controller.
The large boat-anchor class 5.25" full height hard disk had died, and without a
suitable replacement a small IDE drive was chosen. The rest of the machine is
original, including the EGA card with the extra memory daughterboard and the
full slot monochrome card.
While discussing this beast, the topic of putting a CD-ROM on it came up. (I
would never do such a thing except for giggles.) The topic of the CD-ROM led
to a throughput question - could this old monster even do it? As in, is the
ISA bus up to reading from the CD-ROM at a reasonable speed?
Well, let's go throught some quick math. 6 million clock cycles per second is a
lot, but when you consider that each transation on the bus takes 4 to 5 cycles,
and instructions take 4 to 5 cycles (average) on a 80285, the throughput might
not be so hot.
Forget the CD-ROM and let's just pretend it's an I/O device on the bus, like a
fast hard disk. Given a PC AT running at 6Mhz, what can reasonably be expected
for bus throughput? (Obviously this depends on the loop and the instructions
used.) I would have guess 500K or so per second, but now I'm second guessing
myself and I'll actually have to write a small benchmark to try it.
When writing to a hard disk, would this machine have used a tight processor
loop, or would it have used DMA? Under what circumstances would it use DMA to
transfer data to a hard disk?
And one last question .. Unlike the PC and XT, the AT BIOS handles hard drives.
It didn't blink when I removed the crusty WD based controller and replaced it
with a no-name WinBond based controller. Does the new IDE controller really
look that much like the old controller that the BIOS can't tell?
-Mike
I am trying to install some layered products on my AXP-VMS machine (VX42 Multia running v7.3-1) and I keep running into the same error.
for $@sys$update:vmsinstal (product, tried with CXX065 and AXP_DECWRITE31A) dka0:[install_sets] options n
it prints "error reading dka0:[install_sets] AXP_DECWRITE31A.A
software block CRC error
invalid block size in save set
invalid record size in save set
invalid record size in save set"
several times and then errors out to DCL. I'm getting the sets from vmsone.com, but I do have to launder them through other machines, as Bet doesn't have internet access or a web browser. I've tried Windows at work (high-speed network access), thought it was the Windows bitrot that sometimes occurs, but the "A" saveset of DECWRITE31A doesn't even work when downloaded from a Macintosh (tried with VMSINSTAL and BACKUP).
What am I doing wrong, or is it just my cheap equipment (other weirdness- when DECwindows starts it locks up the keyboard - bizarre, don't know if this is a Multia+VMS problem or an issue with the Multia+VMS+SGI keyboard. I'll have to do some testing),
What's a good baseline for Alphas in terms of usability with VMS7.3+? the 233MHz LCA seems to be not much faster than a VAXstation 3100/76, and if I do find another Alpha, I don't want to spend a lot on something that creaks along (and I know what the SPEC scores say- but this VX42 is not up where other machines scoring ~100 SPECxx 92 are in basic useability)
Do you know if there is a service manual for the DEC LA-210 ?? I need
one badly
Stanley Rogers
Halifax Corporation
@ Schering Plough
Memphis Location
Desktop Support
3030 Jackson Ave
Memphis Tn 38151
Office 901-320-4238
Fax 901-320-2101
Cell 908-477-0914
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> Unfortunately, two evenings of googlings has only found me
> consumer-level guides to help clueless PC owners tell SIMMs
> from DIMMs - nothing at the chip level.
Strange, my first google hit gets this ..
http://www.chipmunk.nl/DRAM/ChipManufacturers.htm
Lee.
Fellow Techies,
I have a device (a GPS-referenced clock) that uses an Intel N80C188-16 microprocessor, in a 68-lead PLCC package. Odd as it may sound, I suspect this chip of being defective, and I've been attempting to locate a match for it so I can prove or disprove that theory.
The original part is, of course, no longer manufactured as far as I can tell. Hunting around on the 'net turned up a couple of modern equivalents, one of which is an Intel TN80C188EA20. As near as I can tell, the only difference with this chip is that it can be clocked a bit faster (20MHz instead of 16), and that it has an extended operating temperature range.
There are two other possible candidates available, though not in stock at the moment. Both are made by Intel. One is the N80C188XL20, and the other is the other is the TN80C188XL20.
I know just enough about these chips to be wary of differences in prefix and suffix letters. With that in mind, I have two questions for the group.
(1) Of the above replacements I've mentioned, which one is most likely to be a direct plug-in replacement for the suspect chip?
(2) Failing that -- Does anyone happen to have a known-good N80C188-16 that they could be convinced to part with?
In this same instrument is a Motorola MC68HC11A0FNC11W in a PLCC-52 package. I need to find a viable replacement for it as well. I've had a harder time tracking down possible replacements for it. The only ones I've come across so far, that are available without an enormous minimum purchase, are the MC68HC11E0CFN2, the MC68HC11E1CFN2, and the MC68HC11E1CFN3.
Once again, I'm very leery of mixing/matching suffix codes due to lack of knowledge. I do know this much: The Motorola part is operating with an external EPROM, so the chip itself is ROMless.
Assistance with this mess would be much appreciated. Thanks in advance.
-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"
Hi,
Appearently something like video printers exist. They have "normal" video
inputs and are somehow able to extract a command to make a hardcopy from
the video signal. In my case the command is triggered by a button on an
edoscope control panel. Can anyone tell me how the trigger signal is
embedded in the video signal?
Thanks!
Bert
A couple of weeks ago I mentioned I'd bought a Panasonic RL-H1400
handheld computer with printer/cassette interface. I've now got a second one.
This one also came with a printer, but also with something labelled
'EPROM Extender' This is a tray that the computer fits into one side of,
and the printer into the other side. Underneath there's a PCB with 8
EPROM sockets.
The plastic housing was glued together, but I've got it apart without too
much damage. The PCB also contains 10 or so TTL chips (all
pin-through-hole), a voltage regulator, etc. I've not worked out the
details yet.
One odd thing is that these EPROM sockets, while the type that take
EPROMs in plastic carriers (i.e. they're not normal DIL sockets), are 28
pin, not the 24 pins ones in the HHC itself.
Is this the unit that would take the SNAP development ROMs?
I also have the dual-voltage (110V/240V) mains adapter (my first machine
came with the 110V-only version). This thing (for all it has 2 fuses
inside. in nice little holders) is a royal pain to dismantle. It's
assembled with 4 system-zero tamperproof screws (designed to be
impossible to remove without the right tool), down holes too small to
take the right tool. I ended up drilling out the holes slightly (8mm I
think), then using the system-zero driver to get the screws out.
It appears (but don't blame me too much if I'm wrong) that the HHC
doesn't use the NiCd pack as a shunt regulator, there's a proper
regulator circuit on the logic PCB. In which case it should be safe to
connect the adapter with the NiCd removed or defective.
-tony
>>>/Now, I remember these paperbooks were not too thick (I once
/>>>/had Emmerichs Tiny Assembler and MONDEB from that class -
/>>>/unfortunately got lost - TinyAsm at least can be copied from
/>>>/old 1977 Byte issues), so I'am not sure whether it will wear
/>>>/out more than by simply reading the book. Unless you have a
/>>>/multi-page scanner where you'd have to destroy the spine.
/>
>
>Hey I want them for general reading. How many people still
>have old Bytes in the local libraries? I liked the tiny assembler
>because if I remember right you had structured code to save on
>program lables.
Hi,
the library of our research institute has copies from at least 1/1977 completely
in the shelves (they say 1/76 but looking there, the first ones were missing).
At least the three articles of the TinyAsm are there, and I could make scans of
them on demand. You can find an index of Byte at
http://www.devili.iki.fi/library/publication/10.en.html so if you have specific
articles (limited!) you're interested in I could pdf them. I won't scan everything
due to lack of time, and I won't make them publicly due to copyright concerns, but
we could talk about few articles.
Yes, the tiny assmebler was rather structured, a nice example how to write good
assembler code. Unfortunately, the Byte articles only has a hex dump - the paperbyte
book had a commented disassembly, but I lost that eventually :-(
Regards
Holger
