On 2023-Sep-28, at 3:55 AM, Tom Hunter wrote:
> Thank you very much Brent !!!
>
> Your explanation beautifully clarified how the H7441 works.
> I have asked the same question over at vcfed.org without an answer..
> I hope it is Ok to share to vcfed.org what you wrote as others are likely to
>
We would love the asr 35sWHAT SHAPE ARE THEY IN?
Alas smecc museum is in AZWonder how we could manage this?Ed Sharpe archivist
for SMECC museum.
Sent from AOL on Android
On Thu, Sep 28, 2023 at 7:17 PM, Mike Katz via cctalk
wrote:
Hey folks. I need to re-home a bunch of cool old
Hey folks. I need to re-home a bunch of cool old Teletype Corporation
machines. Working condition unknown, and also have some spare parts. I
am not out to make a mint, so make offer! They seem mostly complete, in
varying condition. Some are nicer than others. They all worked when
stored
The drive is saved from the landfill! It was picked up by a classic
computing fan at noon this morning.
(And yes, it is Pertec-compatible.)
Yeah - reading the source code of QEMU I found the structure of the NVRAM -
EVEN BETTER there was a WEB page with a good description of the various NVRAMs
on Sun machines up to Ultra1. Yes, there "was".
FORTUNATELY via archive.org, that page can be accessed - Tad- here it
is:
Awesome! Didn't realize MAME ws limited to 32-Bit SPARC.
But the emulators can definitely be handy, or at least get you partly
there!
- Ethan
Hi Ethan, thanks for suggesting MAME - did some research and somehow I
do not think it emulates UltraSparc but only 32bit Sarc. But
Hi,
has this found a new home? If not, Is it Pertec-compatible?
I live on the Peninsula and I have a pickup truck. I'll find it a hom if the
alternative is landfill.
thanks
-Jonatahn Stone
On Wednesday, September 27, 2023 at 10:05:04 PM PDT, Len Shustek via
cctalk wrote:
I bought
Hi Ethan, thanks for suggesting MAME - did some research and somehow I do not
think it emulates UltraSparc but only 32bit Sarc. But saw, that QEMU has a
UltraSparc emulation and they...
https://www.qemu.org/docs/master/system/target-sparc64.html
...explicitly claim that a NVRAM is emulated,
for at least Solaris 2.6.
Here a thorough documentation of caddy and the electrical connections (without
warranty):
http://www.baigar.de/UltraBook/UltraBook-HDDcaddy-EBaigar-20230928.pdf
CAUTION: The plug listed there probably is, what you find within the Notebooks,
so it should fit the adapter
On 9/28/23 08:17, Robert Ollerton wrote:
> i'm looking for cables for this if anyone has one to spare or a lead
> where to find em.
>
What are you connecting to at the far end? The drive connections are
simple 2x50 pin IDC (ribbon) headers. I made my own--took me about 15
minutes. I used
i'm looking for cables for this if anyone has one to spare or a lead where
to find em.
much thanks
bob.
On Wed, Sep 27, 2023 at 11:00 PM Chuck Guzis via cctalk <
cctalk@classiccmp.org> wrote:
> I can recommend this drive. Very solid units and used on a lot of Sun
> installations, which
Hi Jonathan, will try that soon and I have got GALEP3 and a TopMax, so reading
a 1643 with pins left out should be easy. Zeroing is a good idea for the
beginning - just needing some content there that brings me to the Firmware ;-)
This guy bucks.
I'm much less an analog guy, but that explanation was clear enough to make
sense of every stage. Very cool!
--
Anders Nelson
www.andersknelson.com
On Thu, Sep 28, 2023, 3:29 AM Brent Hilpert via cctalk <
cctalk@classiccmp.org> wrote:
> On 2023-Sep-27, at 9:01 PM, Tom Hunter via
Booted the SPARCbook 3, its battery is in fact dead, and aside from taking a
little longer to come up (totally expected) it's fine.
Thanks,
Jonathan
--- Original Message ---
On Thursday, September 28th, 2023 at 07:41, Jonathan Chapman via cctalk
wrote:
>
>
> Yet we have a few
My Ultrabook is a U20-14-1X-128C3.
Hope that helps,
Santo
On Thu, Sep 28, 2023 at 1:54 AM erik--- via cctalk
wrote:
> @Jonathan: Wow, amazing project in creating the replacement NVRAM. You
> really spent lot of time and efforts into that one. To attach the external
> battery I took a X-Ray to
Yet we have a few datapoints showing that a dead NVRAM/RTC still boot
UltraBooks just fine! As I said, I personally confirmed with my UltraBook IIe.
Pretty sure the NVRAM is dead in my SPARCbook too, I can confirm that today.
Thanks,
Jonathan
--- Original Message ---
On Thursday,
Thank you very much Brent !!!
Your explanation beautifully clarified how the H7441 works.
I have asked the same question over at vcfed.org without an answer..
I hope it is Ok to share to vcfed.org what you wrote as others are likely
to struggle too with the complexity of the H7441 in the future
> Hmmm, not sure on that one actually. So it does not boot up at all?
Yes - exactly!
> In the desktop Sun workstations and e.g. the Tadpole SparcBook, a lost NVRAM
> at least
> shows the firmware prompt on the screen (no HOSTID and no ethernet MAC).
Yes, that is different in the UltraBooks.
On 2023-Sep-28, at 12:29 AM, Brent Hilpert via cctalk wrote:
> ...
> Excessive current through Q5 produces a V-drop across R10 which may turn on
> Q7 to take the PWM-mono into reset (E2.4=low).
> D7,D8,R3 clamp and sink reverse voltage/energy from the T1 secondary to avoid
> reverse
On 2023-Sep-27, at 9:01 PM, Tom Hunter via cctalk wrote:
> The DEC H7441 regulator is a relatively complex circuit using 2 x 555
> timers, 2 x LM301 op-amps, 2 x transformers and 2 inductors
> I am struggling to understand how it is meant to work and was hoping to
> find a maintenance manual for
I can recommend this drive. Very solid units and used on a lot of Sun
installations, which usually included the extra 256K buffer option.
Yes, it's heavy, particularly if you install it in an EIA rack--you
should have the heavy-duty mounting kit for it.
I picked mine up as a new unit--surplused
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