>It should be happy with parity. Note that some unlucky people have ended
>up with a less common variant of the IIci that *requires* parity RAM. To
>check if you have one of these units, look for the 'parity' label on the
>motherboard and see if there is a chip there. If it is, hope you have
>parity RAM on hand, because that unit will not work without it. Fortunately,
>the vast preponderance of IIcis don't care what type of RAM they get.
There is a similar build of the IIfx... I saw a tech note on it while
perusing the TIL earlier... it seemed to imply that it was done for some
government spec reason, and was only issued to government sales... but
that was just implied, not actually stated, so who knows if they were
released to the public as well (or if some of those government ones made
it into the private sector)
-chris
<http://www.mythtech.net>
>It is also worth noting that with a full 128MB installed, the on-boot
>RAM test takes a considerable amount of time, something like over two
>minutes
YIKES!
Is the disable startup ram test option in the memory control panel as
early as 7.6? or did it first appear in 8.0? (7.6.1 is the latest the
IIci can handle... to check for the disable feature, open the memory
control panel while holding down option, an extra choice will appear at
the bottom allowing you to disable the startup ram test)
-chris
<http://www.mythtech.net>
>Does anyone know what the maximum memory you can put in a IIcx (I suspect
>that
>the answer is the same as a IIci). I've got a IIcx that I paid far too
>much for
>when it was new (say $10K) and it's only got 8Mb. If I could upgrade to
>more memory
>it might be worthwhile turning it on again and running A/UX (this
>corresponded to
>about $3K of the cost with another $2.5K being the 300Mb SCSI disk drive).
128mb
For this and other bits of Mac hardware info, go to the souce and check
Apple's spec list at <http://www.info.apple.com/applespec/applespec.taf>.
-chris
<http://www.mythtech.net>
>It's a pity that Apple didn't decide to have wireless keyboard and mouse
>for the new iMAC.
That was my personal only complaint with the new iMac. If they had a
wireless keyboard with built in track pad... I would have considered it
perfect. (Despite that ommision, I still want one)
But I figured I was just being too picky... but while sitting at my
parents house this evening, I was talking about the new iMac, and my
Mother of all people piped up and said they should have given it a
wireless keyboard. Her only look at it was the Time magazine article, her
complaint was, it was perfect for the end table, except for the "tangle
of wires" needed for the keyboard and mouse.
So if my mother could see this as a problem, why couldn't Jobs?
-chris
<http://www.mythtech.net>
>It is uses a 25mhz Motorola 68030 processor. What would be the
>approximate Intel/PC equivalent? The 386DX-25? The 486DX-25? faster,
>slower, what? I don't have much Mac experience at all. I own a Plus,
>but after cleaning it, I haven't done anything with it but let it sit,
>mainly because of the silly 800K drives.
The 68030 and 68040 were roughly equivelent to 80386 and 80486
(respectively). Clock speed to Clock speed. There didn't start to be
major differences until the PPC chip line. But frankly, that is just
"rough analogy" as what you run will make huge differences in performance.
The only thing that can be tough about the IIci is that is uses 30pin non
parity simms, which are starting to be harder and harder to find
inexpensively. The IIci *might* be able to work with parity simms, not
sure (early macs could NOT, but some of the later ones IIRC could use
parity or non parity)
>It has a Radius video card, but unfortunately, the Radius monitor got
>sold separately. It was a "Pivot" monitor. I pulled the monitor of the
>nonfunctioning IIcx and the ci boots fine, and is running System 7.1.
>How much should I offer?
The IIci has a built in video card as well. You can use a standard Apple
RGB monitor with it, or get an RGB to VGA adaptor (or I can send you the
pinouts for making a good one), and use any VGA or SVGA monitor.
As far as what to offer... as little as you can get away with. The
machine is decent, but at this point, low end PPCs are winding up in
dumpsters. So unless you WANT the IIci compared to you just want A
useable mac... I wouldn't pay much more than about $10.
-chris
<http://www.mythtech.net>
>The Zebra
>systems that ran Pick were produced by General Automation, not STC. Unless
>of course, they were rebadged somehow.
I have NO idea who made the Zebras I had. I just always remembered the
name of the machine was Zebra (that and for the last month or so, I have
been tripping over the manuals since they migrated from their storage
shelf to the floor next to my desk for lack of room elsewhere)
I DO know that they ran Pick, so if STC didn't make a Pick version of the
Zebra but General Automation did, then I would have to say they were
probably General Automation machines.
>Well the '59 version is 6' high by 9' by 2', plus
>a desk for the operator console and i/o equipment.
WOA... definitely NOT the machines I had. I don't remember the exact
size, but they were luggable size (large desktop PCish). Probably about 8
or 10 inches high, 18 inches or so wide, and about 36 inches long. Don't
remember the weight, but I carried them to the trash, so they were
manageable. Both of mine had been stacked on top of each other, and sat
on a metal desk.
-chris
<http://www.mythtech.net>
Try Dial Electronics http://www.dialelec.com.
They have TMS4060 in stock
TMS4060JDL 3-4 WEEKS CALL
TMS4060JL STOCK ?8.4999 $12.74985
TMS4060NL 3-4 WEEKS ?1.1199 $1.67985
Note: J suffix is ceramic package, N for plastic.
Best Regards
Chris Leyson
On Jan 13, 20:27, Tony Duell wrote:
> Yes, it's certainly a switching regulator, and the inductor (the large
> block with screw-post terminals) is needed for it to work. Don't try
> shorting it out -- I am not sure what happens if you do, but I would hope
> the crowbar would fire as soon as the chopper turned on and supplied
> 30V-ish to the output (with no inductor, the output voltage would rise
> essentially intantaneously).
>
> These supplies will whistle if :
>
> The capacitors -- particularly the output one -- have high ESR. Check or
> replace them.
Done.
> The load is just 'wrong' (these, AFAIK, are not constant-frequency
> supplies). Try adding or removing load (!).
Tried that. At very light loads, the whistle almost disappears. It gets
louder and the pitch changes as the load increases. The most load I've
tried is a full backplane, though I'm not exactly sure what the current
drawn would be.
> The Inductor potting compount is breaking up.
Swapping the inductors between 4 x H744 and 2 x H745 makes no apparent
difference, and I expect it's unlikely they've all suffered the same fate.
They came from two different machines.
> Loose fixing screws can cause odd noises -- try tightening everything in
> the PSU chassis.
One of the first things I checked :-)
I suspect, as Allison wrote, that it's just the normal noise from that type
of regulator, and I'm just a bit oversensitive to it :-(
Thanks for the various suggestions, everyone. I'll try putting covers on a
couple of them (one already has one, and some of the other regulators do as
well) and mounting them on a sheet of damping material, and learn to live
with the residual noise.
--
Pete Peter Turnbull
Network Manager
University of York
On Jan 13, 20:28, Tony Duell wrote:
> > On Jan 12, 20:14, jpero(a)sympatico.ca wrote:
> >
> > > Sounds like PSU is reacting to overloading or medium shorts
> > > downstream of that PSU outputs. Also can happen with dried
> > > up capacitors (too high ESR).
> >
> > I don't think it's any of those. The regulators all make a similar
noise
> > when I put them on a dummy load drawing 5A, on the bench. And I'm sure
>
> Have you tried a lighter _or heavier_ load? It can make quite a
> difference.
Yes, it changes the pitch somewhat (as I would expect) and it gets slightly
louder with a heavier load.
> > it's not bad caps, as two of them are ones I repaired recently.
>
> Which, if any, capacitors did you replace?
In one H744, all the electrolytics (the output one had gone, so I figured I
might as well do the lot).
--
Pete Peter Turnbull
Network Manager
University of York
