here we go. No I wasnt aware of a ban on pc-talk here.
And my point was 28kc is below even the hscan of
comparitively low-res vga.
--- cctalk-bounces at classiccmp.org
<pat at computer-refuge.org> wrote:
> On Sunday 16 July 2006 13:03, Chris M wrote:
> > no, 28khz is not what you *should* be seeing. The
> > original vga fixed frequency stuph ran at 31.5kc.
>
> Scott said:
> > these old SGI monitors
> and
> > There are about 9 boards in the graphics half
>
> I don't know of any VGA controller that had 9 boards
in it (or was designed to
> hook to an old SGI monitor)...
>
> You do realize that the "stuff" we talk about on
classiccmp are usually things
> that aren't PC's, right?
>
> Pat
> --
> Purdue University ITAP/RCAC ---
http://www.rcac.purdue.edu/
> The Computer Refuge ---
http://computer-refuge.org
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the keyboard is for a NEC APC III. Some keys are
intermittentsometimes. Other times theyre not. :D. I
think Ill try soapy water and a splash of ammonia.
Shaken not stirred. Next question - how does one scope
out an 8048s code without enlisting the services of a
soldering iron? I wouldnt be all that adverse to
cutting a few traces.
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> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org]On Behalf Of Chuck Guzis
>> On 7/15/2006 at 3:09 PM Fred Cisin wrote:
>>
> >GCR
> >MFM without WD/IBM sector headers (Amiga)
> >certain address marks
> >with some FDC's FM
> >with some FDC's 128 byte sectors
> >damaged disks (both accidents and some copy protection)
>
> Also:
>
> Hard-sectored
> "Strange" recording methods (e.g. OSI)
>
> --Chuck
>
Fred and Chuck seem to sum it up quite nicely. The "image" programs like teledisk and imagedisk are very limited in what they can image. What they do, they do very well, but they rely on a WD or WD emulated chip in the floppy control circuit. Since the current copyright standing of teledisk is not known to me, but that of imagedisk is, for these quick and dirty copies, I rely on ImageDisk. If I find images in teledisk, I write them out to physical media and re-read them into ImageDisk files.
The catweasel does not rely on the WD style controllers. It can handle the "funny" address marks, hard sector disks, GCR, read and write FM formats reliably, and has a host of options for dealing with damaged disks.
Just my $0.02...
Kelly
no, 28khz is not what you *should* be seeing. The
original vga fixed frequency stuph ran at 31.5kc.
--- cctalk-bounces at classiccmp.org
<julesrichardsonuk at yahoo.co.uk> wrote:
> Scott Quinn wrote:
> >
> > I'm not looking for a potted answer here - just
ideas for where to look. Is ~28KHz a
> > common HSYNC frequency? seems too low for
anything I've seen.
>
> Hmm, I'd expect an SGI (or similar machine of its
class) to be attempting
> 1024x768 at 60Hz non-interlaced minimum, so hsync
somewhere around 50KHz.
>
> > What else should I look at for a non-syncing
monitor?
>
> Is it the monitor or the machine? For a monitor test
I'd throw it on any old
> PC and see what I could get out of it (wire up a
sync combiner if the monitor
> needs csync; easy to do)
>
> > USENET seems to indicate 48.8 KHz HSYNC on these
old SGI monitors (SGI employee posting),
>
> Plausible, anyway.
>
> I suppose it's just possible that you could do
interlaced 1024x768 with a
> 28KHz signal, but it'd be hell on the eyes. Possibly
that's the SGI's default
> though if it can't detect what monitor you're
plugging into it? (scratch that
> idea if the outputs are BNC, but if the video's done
over some form of
> multi-pin connector, might it not need strapping in
a certain way to indicate
> display type?)
>
> cheers
>
> Jules
>
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I have an HP 2621B terminal WITHOUT the keyboard free
to anyone who wants it. It does power on but displayed
characters (it has a menu at the bottom of the screen)
are dim and a little out of focus.
Bob
Hi all,
I'm going to go to a hamfest this weekend to look for an oscilloscope.
Do you guys have any pointers on what to look for, and how to know if what
I'm looking at has problems?
Any advice would be appreciated.
Thanks!
Julian
> "White spirit, also known as Stoddard solvent is a paraffin-derived clear,
>transparent liquid which is a common organic solvent used in painting and
>decorating. It is a mixture of saturated aliphatic and alicyclic C7 to C12
>hydrocarbons with a maximum content of 25% of C7 to C12 alkyl aromatic
>hydrocarbons."
>
>So, basically a close relative to paint thinner, right?
Is paint thinner (mineral spirits, whatever you want to call it . . .)
Jan-Benedict Glaw wrote
> I've written the Linux driver for this mouse
>and its protocol is not compatible with anything else. So if you want
>to use such a mouse on eg. a PeeCee, you either need to write a proper
>driver for it (if the operating system doesn't have one), or put a
>microcontroller in between for protocol conversion to PS2.
So is there some big cache of these things (other than the $80 e-bay ones)?
everyone seems to assume that people want to use the VSXXX on a PC, not get a mouse
for their DEC.
I guess it's back to using an X-terminal- won't have to get the 15-pin breakout cable then either.
Idle speculation- I wonder which mouse is closest for conversion
purposes (definitely not HP-HIL, perhaps Sun or old SGI?)
On Jul 15 2006, 13:35, Ethan Dicks wrote:
> On 7/15/06, Jules Richardson <julesrichardsonuk at yahoo.co.uk> wrote:
> > Just going through the motions of reseating chips (again - tried
once, but
> > doesn't hurt to do it a second time!)
>
> Doesn't hurt, but if the sockets themselves are a problem, won't do
much good.
>
> > Does anyone have a photo, PCB layout, or access to a real board so
that they
> > can check ROM chip locations for me?
>
> Alas, no... there's a lot of stuff on zimmers.net (what was formerly
> on funet.fi), but I no longer have a static PET... sold it years ago.
>
> > Date codes are all in 1978, so presumably I'm looking at a first
issue of the
> > ROMs?
> I would say so. BASIC 2 for the newer PETs came out around
1978/1979,
> ISTR; with the upgrade following on its heels. The only way to be
> sure is the part numbers, though (which, I think, have already been
> correctly identified by another list member).
Yes, Jules' machine has the first issue. It sounds like he has almost
exactly the same version of machine as I do; mine has the same MPS6540
ROMs and MPS6550 RAMs. Except for the dead ones that I've replaced,
that is: many of those old MOS Technology chips are dying of old age,
and I've replaced three RAM chips in my PET in the last two years.
--
Pete Peter Turnbull
Network Manager
University of York
I'm looking to merge a couple of RZ29's down to a single RZ28
(everything will fit). Does anyone have any advice?
Basically I'm trying to downgrade a VAXstation 4000/vlc from a BA350
with 3 7200RPM RZ29's (user disk is a shadowset) to a single 5400RPM
RZ28 that I'll put in an external enclosure after pulling it from the
SBB brick. The BA350 and 3 RZ29's generate a *lot* of heat.
I've done plenty of migrations to larger disks using BACKUP/IMAGE,
but have never tried to combine separate disks onto a single disk. I
would think that the following would work, but it doesn't preserve
the ownership of the directories and files (at least under 5.5).
BACKUP DSA1:[GU*...]*.*;* [...]/VERIFY/LIST
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com (primary) | OpenVMS Enthusiast |
| MONK::HEALYZH (DECnet) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
