Still having problems with the Sun 3004 in my CV. A 3/110 board works fine in it, but the 3004 CPU continually cycles the
8->7->6->5->4->3->2->1 on the LEDs that Sun-3s do once on powerup. Has anyone seen this before to narrow down
the possible things to look at?
No, there is no output on the console (TTYA) port (checked the teminal and cabling with the /110 CPU to verify that it works)
On May 13 2006, 9:32, Jochen Kunz wrote:
> On Fri, 12 May 2006 23:21:10 +0200
> Gerhard Lenerz <mail at g-lenerz.de> wrote:
>
> > No need for ECC RAM
> ECC == parity? I always thought the SGI machines need ECC / parity
RAM.
> (I.e. SIMMS with 36 data bits.)
ECC != parity.
Parity uses a single bit (in the case of 36-bit SIMMs, one bit per
byte) to detect single-bit errors. It will tell you a byte is wrong,
but won't tell you which bit, so it provides no correction capability.
It will not detect two-bit errors.
ECC stands for error correction code, and is a multi-bit arrangement
capable of not only detecting errors but providing enough information
to correct some of them. How much it detects and provides correction
for, depends on how many bits and how they're organised.
--
Pete Peter Turnbull
Network Manager
University of York
On May 15 2006, 10:08, Jochen Kunz wrote:
> On Sat, 13 May 2006 11:14:59 +0100 (BST)
> Pete Turnbull <pete at dunnington.plus.com> wrote:
>
> > ECC != parity.
> I know. Sorry for not being clear in my previous mail. I meant:
Usually
> the terms "parity SIMM" or "ECC SIMM" are used for SIMMs with 36 data
> bits. If the extra 4 bits are used for parity or ECC depends on the
> memory logic in the machine, not on the SIMM.
4 bits in 36 isn't really enough for useful ECC. That's why on SGIs
you sometimes see the error message "unrecoverable memory error" and
relatively rarely see "Recoverable memory parity error corrected by
CPU" :-) Most ECC memory uses more bits, and 36-bit memory is rarely
described as ECC memory rather than parity memory.
> There are also some machines (some sun4c and some EV5 Alphas) that
need
> 33 bit RAM. They use one parity bit per 32 bit word.
True, though those will work with 36-bit memory as well -- they just
ignore the extra bits. At least, that's true of the Suns; I've not
actually tried it in Alphas but I don't see why it should ever matter.
--
Pete Peter Turnbull
Network Manager
University of York
> From: Roger Merchberger <zmerch-cctalk at 30below.com>
> The problem is I need to use a PC power supply (AT-class with it's own
> power switch) as a 12V power source, and the only one I have access to
> needs a minimum load of 3Amp on the +5Volt line.
How about a light bulb? I'd try a bulb for an automotive brake light. If
one's not enough, you could connect a few in parallel. If you find the
6V variety, it might work even better, but you should at least draw some
reasonable current with the 12V ones. If you really wanted to have
fun, you could try a headlight...
BLS
Hi Kevin ?
I saw a Posting on Yahoo for your add offering Greenbar Paper.
My Daughters Teacher uses it for 2nd grade writing and asked me if I knew where to get some.
I live in Trumbull CT and would have you ship it to the School.
Thanks
Timmy from Connecticut
I have too many projects (including my 8/A and 11/23+) and not
enough time, and don't want to keep my 11/24 sitting until the
mice build nests in it. It seems to be alive (comes up to ODT on
the console port) but I haven't tested it otherwise. I posted the
card list several months ago on cctalk but to save you looking it
up, here it is again:
1 M7133 KDF11-UA 11/24 CPU with line clock and 2 SLU
1 M7134 KT-24 Unibus map, extension to 22 bits
1 M8743 (ECC RAM, either 512 Kb or 1 Mbyte)
2 M8722 (ECC Memory either 128 Kb or 256 Kb each)
1 M8188 FPF11 floating point processor
1 M7762 RL11 disk controller RL01/02
1 M7258 LP11 printer controller
1 DSD A2130-6 disk controller?
4 M7819 DZ11-A eight RS232 ports each
1 M920 Unibus connector
1 M7297 RH11 MASSBUS Parity Control
1 M7296 RH11 MASSBUS Control & Status Registers
1 M7295 RH11A MASSBUS Bus Controller
1 M7294 RH11 MASSBUS Data Buffer and Control
3 M5904 RH11 MASSBUS Control Transceivers
1 M9300 Unibus terminator
1 M9312 Bootstrap Terminator
Looking for a good home, please make a reasonable offer. Will be
going on that auction place next. Shipping may be expensive (that
chassis/power supply is *heavy*). Can email a pic.
I'm in south central Missouri, zip 65775, if you know what it
weighs and want to estimate shipping.
thanks
Charles
I have just gotten about 80 RK05 disk packs for a PDP-11. They have been
stored in an office environment, but most have not been used for at
least 15 years. Some have labels indicating they were cleaned by SCOPUS
in the late '80s.
Any recommendations on the best way to store them would be helpful.
If anybody is interested in some of them, they can be had for the
shipping. Contact me offline if you are interested and we can talk about
the details. I am located in Ohio, USA 45865.
Okay, so, I'm back to working on my /34. I think I made significant
progress tonight.
What's going on is, I've narrowed it down to low AC levels coming off
the transformer. The printset and H7xx modules specify an incoming
AC of 20-30v (printset says specifically 28v.) All lines coming off
the transformer at P1 are reading a value of 10-15v.
So that leaves two possibilities. It's either the transformer, or
the AC input box.
I'd like to test the levels coming out of the input box, but I
wouldn't know where to go, as my understanding of electronics fades
fast at this time of the night when I've been up since 07:00.
Okay, so maybe I traced it back that far, it got more complicated,
and it's late and I'm feeling lazy and hoping someone will throw me a
bone here :) in any case, advice is always appreciated.
toodles
Julian
In a message dated 5/13/2006 3:57:06 P.M. Eastern Standard Time,
teoz at neo.rr.com writes:
> I've got a PS/2 Ultimedia 77 with an Actionmedia video capture card hooked
up
> to a gooseneck composite colour camera all running under OS/2. The primary
> limitation is available video resolutions and the funky format of the
saved
> video files but it's pretty cool to capture live video on a 66mhz 486 with
32meg
> of memory.
http://www.tavi.co.uk/ps2pages/ohland/actionmedia.html
Is this it?
Seems that IBM PS/2 cards are well documented on the net.
--
yup, that's it.
In a message dated 5/12/2006 12:24:46 AM Eastern Daylight Time,
teoz at neo.rr.com writes:
Not sure if I am the only one interested in old video capture gear on the
list. Anyway I won some old Optibase ISA video capture cards on ebay
(MPG-4000 and PC Motion 1993 vintage I believe) and was wondering if anybody
has any information on them and maybe drivers. I emailed the company a few
days ago and no word yet (doesn't look like they support anything that old
anymore). They seem to be MPEG1 boards and one card has dual DSP's with
heatsinks and fans (have not received them yet).
If anybody else is into vintage analog video capture let me know, I mostly
deal with PC and 68K Macs (10 years old or older to be ontopic).
--
I've got a PS/2 Ultimedia 77 with an Actionmedia video capture card hooked up
to a gooseneck composite colour camera all running under OS/2. The primary
limitation is available video resolutions and the funky format of the saved
video files but it's pretty cool to capture live video on a 66mhz 486 with 32meg
of memory.
