On Thu, Feb 03, 2022 at 06:06:10PM +, Peter Coghlan via cctalk wrote:
> Today I finally managed to check it out. The ceramic F4A mains input fuse
> beside the power switch on the back panel had blown. When I opened it up,
> I found a POWER-ONE MAP80-4000 power supply. The main chopper
If it's only got 18 pins (per the subject line) then I don't think it
can be a 27S29. Based on the label my guess would have been a PAL/GAL
of some kind, but I can't immediately think of any standard parts that
would have had less than 20 pins there either...
p.
On Mon, Jun 01, 2020 at
On Sat, May 02, 2020 at 10:22:02AM -0700, Alan Perry via cctalk wrote:
> >sc0 at vme24d16 20 vec 0x40
> >sd0 at sc0 slave 0
> >si0: sc_cmd: scsi bus continuously busy
> >sc0: resetting scsi bus
> >sd1 at sc0 slave 1
Not that I know these particular devices, but is it at all possible one
of
On Thu, 2019-03-28 at 17:02 +, Phil Blundell via cctalk wrote:
> I'll see if I can locate my unit later and confirm that.
FWIW...
https://photos.app.goo.gl/2mohWXwcdBS8uE9T9
p.
On Thu, 2019-03-28 at 09:43 -0700, Al Kossow via cctalk wrote:
> Does anyone have a working Apollo 3C505 ISA ethernet board handy to look at?
I have a 3c505 somewhere but I don't think it is an Apollo one.
The Linux kernel configuration help message from that era read:
tristate "Apollo
On Mon, 2019-03-18 at 13:03 +0100, GerardCJAT via cctalk wrote:
> The TECHNICAL problem : I am repairing a not so old electric typewriter.
> I need to replace what I call : a flexible printed circuit ( strip / ribbon /
> what's the "correct" word ??? ) *** AND *** the associated connector
> I
On Fri, 2018-12-07 at 14:18 -0500, Paul Koning via cctalk wrote:
> Does a plain LCD panel have delay? If not, what about a TV used as a
> monitor?
Depends what you mean by a "plain LCD panel". If you mean the glass
itself, no, they generally scan synchronously to the input signal and
don't have
On Tue, 2018-04-03 at 21:07 +0100, Ian Frost via cctalk wrote:
>
> Recently booted up my B Powermac G3, all came up fine including the
> 17” CRT monitor. However after a second or so, the
> monitor gives a ‘popping’ sound and the image on the screen expands
> then shrinks. This repeats every few
On Mon, 2018-01-29 at 16:06 -0500, David Bridgham via cctalk wrote:
> For those of you who are following along with our QSIC project, today
> we
> booted v6 Unix successfully for the first time. We'd first tried
> this a
> week or two back but discovered that Unix does use partial block
> reads
>
On Mon, 2018-01-08 at 09:13 -0600, John Welch via cctech wrote:
> Does anyone know this board? I think it may be a SCSI controller. I
> cannot tell if it is Unibus or Qbus.
According to:
http://www.dilog.com/unibus.html
it's:
SU723A
SCSI, TMSCP, 7drives, Quad Height.
and (judging from the
On Fri, 2017-10-27 at 13:38 -0700, Brent Hilpert via cctalk wrote:
> I wonder if they were just trying to draw an analogy between the
> inherent dynamic operation requirements of magnetic logic and the
> dynamic operation requirements of some (many?) NMOS designs (not
> really inherent to NMOS).
On Mon, 2017-10-23 at 20:14 -0500, Jules Richardson via cctalk wrote:
> There appears to be a photo of the internals here, if that helps at
> all:
>
> http://museum.ipsj.or.jp/computer/device/magnetic_disk/images/0011_03
> _l.jpg
>
> ... it's a little small, so hard to tell what's going on for
On Mon, 2017-10-23 at 21:45 +0100, Rob Jarratt via cctalk wrote:
> I am now looking at the H7826 PSU that came with a TURBOchannel
> Extender. It
> looks like there may have been capacitor leakage and some heatsinks
> will
> need to be replaced. I have posted pictures here:
>
>
>
>
No, that was what I was thinking of with the "some sort of latch"
comment. Where is the head lock?
Thanks
Phil
On Mon, 2017-10-23 at 10:19 -0500, Tom Uban wrote:
> I assume you've released the head lock?
>
> On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
&
Anybody familiar with the internals of these disks? I have one here
which seems to have the positioner stuck at track zero. I'm not sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I am a
bit reluctant to just
On Thu, 2017-10-05 at 11:50 -0700, Chuck Guzis via cctalk wrote:
>
> What I found curious was the CDC manual that called SCSI "SASI
> subset".
> To me that says that SASI was the more elaborate protocol and SCSI
> initially picked and chose from it.
I think that's just bad/ambiguous wording and
On Tue, 2017-10-03 at 18:56 +0100, Pete Turnbull via cctalk wrote:
> So there's clear proof that at least three companies in the UK were
> using the term IDE before (or at least by) 1990. I never heard it
> called anything else in that timeframe.
That pretty much matches my recollection also.
On Tue, 2017-09-26 at 14:19 -0400, Ethan via cctalk wrote:
> I don't know if it's a good idea to low level format a drive or not.
Low-level formatting (which, at the time, was just called "formatting")
used to be quite a routine operation on ST-506 MFM and RLL hard disks.
They usually came
On Fri, 2017-08-04 at 15:04 -0400, Noel Chiappa via cctalk wrote:
>
> And this path allowed us to get rolling without having to go through
> the PC-board fab cycle... (including the complexity of doing boards
> with gold fingers).
Just as an aside on that, I doubt you really need the hard gold
On Fri, 2017-08-04 at 09:17 -0800, David Bridgham via cctalk wrote:
>
So my question is: do industrial SD cards exist?
Yes they do. Most of the big card manufacturers have an "industrial"
range, for example:
https://www.sandisk.co.uk/oem-design/industrial/industrial-cards
There are also
On Fri, 2017-08-04 at 07:20 -0700, Al Kossow via cctalk wrote:
>
> Can you actually buy SATA PHYs in small quantities now
> or even SATA to PATA bridges?
I can't think of anybody who makes discrete SATA PHYs, and there isn't
a standardized interface for the other side of the PHY so I suspect
On Fri, 2017-08-04 at 08:53 -0400, Noel Chiappa via cctalk wrote:
>
> But are SD cards really that unreliable?
It depends on exactly how you measure "reliable". There are a few
different things going on, and it differs from one SD card to another.
Firstly, there are multiple types of flash
On Sun, 2017-05-21 at 10:08 +0100, Aaron Jackson via cctalk wrote:
> I won't post it again to avoid spamming people, but just one reminder
> to
> say that the below still available. I did have some interest from
> abroad
> but shipping would be far too expensive and difficult.
I'd be interested
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