[rescue] Sun 3/50 scsi boot string

[Kurt Nowak]

Yeah, I also thought it looked like 220 when it was still on board at a
hard to see orientation. I'll return the one I bought from digikey. Thanks
for the offer but in the mean time I bought some mil grade 120 uf 10VDC NOS
Kemet hermetically sealed ones on eBay.
I replaced the broken micro fuse holders and still waiting on the EEPROM so
I can flash the latest boot prom.

-Kurt

On Sun, Jan 1, 2023, 17:09 Jonathan Chapman via rescue <rescue at sunhelp.org>
wrote:

> Kurt,
>
> Interesting! Mine must've been messed up enough that it looked like 220
> uF. Must just be bulk decoupling or something, as the Sun 3/50 works just
> fine with 220 uF installed!
>
> I do have 120 uF but not in a size that'll fit...they're something huge
> like 75V. If you're interested in the 220 uF as I used in my 3/50, let me
> know!
>
> Thanks,
> Jonathan
>
> ------- Original Message -------
> On Friday, December 30th, 2022 at 20:20, Kurt Nowak via rescue <
> rescue at sunhelp.org> wrote:
>
> Jonathan,
>
> BTW, I just removed that tantalum cap on the 3/50 and mine is a 120
> micro-Farad not 220 as stated in your write-up.
> Here is the datasheet for it. There is no 220 for a 10VDC:
> https://www.mouser.com/datasheet/2/427/mtp-1211468.pdf
>
> Here a pic of mine:
>
> https://drive.google.com/file/d/1RIajNrA8znWZgHpUOC2RmGJtdQ_skm4j/view?usp=share_link
>
> -Kurt
>
>
>
> On Sun, Dec 25, 2022 at 6:08 PM Jonathan Chapman via rescue <
> rescue at sunhelp.org> wrote:
>
>> Kurt,
>>
>> IIRC the cutoff is ROM v2.6 as the first version that supports booting
>> IDs other than 0, so that makes sense!
>>
>> I had the replacement tantalum capacitor in stock. I believe I noted the
>> capacity and voltage in the writeup, but you may find that the replacements
>> are very expensive. Let me know if you require one, as I have many.
>>
>> Sounds like you've got a nice set of Sun3 boxes! I've got the 3/50, a
>> 3/160, and a new-to-me 3/260 I haven't gone through yet. The 3/50 was my
>> first Sun3 machine, and I was *thrilled*​ to find it had the RAM
>> upgrade, as that's of course one of the biggest drawbacks to the 3/50. Just
>> this week, I finally got an ECL monochrome monitor for the 3/50, which
>> works but is currently being recapped as it was showing signs of a failing
>> cap in the cathode supply circuit.
>>
>> W.R.T. RAM sizing, that upgrade board really does give 8 MB RAM on my
>> system, so that's correct -- just not possible with a *stock*​ Sun 3/50.
>>
>> Thanks,
>> Jonathan
>>
>> ------- Original Message -------
>> On Sunday, December 25th, 2022 at 14:18, Kurt Nowak via rescue <
>> rescue at sunhelp.org> wrote:
>>
>> Hi Jonathan,
>>
>> Thanks! Yes, that is what I had suspected as well since mine will also
>> boot with ID 0 - sd(0,0,0). I'll download the latest and greatest ROM image
>> from sun3arc and flash a new one after I order a new blank. Mine is not
>> super old, its v2.3 where the latest sun3arc has is v2.8. But maybe old
>> enough to not cause it to boot sd(0,18,0). We'll see...
>>
>> Also thanks for doing the writeup. Mine also has the same corroded
>> tantalum capacitor but the leads are still intact. Would you happen to have
>> a source/PN for the one you replaced it with? Its hard to read the script
>> on the current one. The machine seems to run fine but I would feel more
>> comfortable replacing it since I've heard bad things about tantalum caps
>> exploding. I also had the dead battery and one of the micro fuses was
>> missing. I replaced the fuse but noticed that both holders were really
>> loose in holding the fuses, so I'll look at replacing those holders. I see
>> both Mouser and Newark carry the LittleFuse series 273 micro fuses -
>> hopefully they have the holders as well.
>>
>> Generally the machine works great so far as a diskless client off of my
>> 3/60. I have a small Sun3 "zoo" happening at the moment
>> (3/80,3/60,3/110,3/160 and 3/50) with my goal of getting them all up and
>> running with SunOS 4.1.1. Both the 3/80 and 3/60 are up and running and
>> have the latest ROMs and can boot off of CD. Since the 3/60 is the common
>> arch for the remaining creatures I decided to install the OS as a
>> heterogenous server, serving up the 3/50 and 3/110 (eventually the 3/160
>> too) as diskless clients. But my goal was to make those stand alone
>> machines, so following the instructions in Appendix C of the 4.1.1
>> installation manual I was able to do a remote CD installation on both
>> machines. Thanks to Jay York for providing a pair of old Seagate drives
>> along with other stuff for those two.
>> Regarding the main board, it was interesting to see what yours looks
>> like. My configuration is a bit different - I have an interesting 4/8MB
>> add-on Helios expansion board with 4 empty slots. Maybe this was a pretty
>> common upgrade - I don't know. I don't have any spares so I'll leave it as
>> 4MB. Speaking of memory, yeah I, don't know why it always seems to show
>> double the amount of memory that is physically installed when the machine
>> goes through POST - mine also comes up with having 8MB. This seems to be
>> common to all my Sun 3 machines though. Even the 3/80 has 12MB installed
>> but shows up as having 24MB.
>>
>> Here are some pictures:
>>
>> https://drive.google.com/drive/folders/19KeBZffqrzuo1eMb-m21trSNLI3ixRqq?usp=share_link
>>
>> -Kurt
>>
>>
>>
>> On Sat, Dec 24, 2022 at 4:52 PM Jonathan Chapman via rescue <
>> rescue at sunhelp.org> wrote:
>>
>>> Kurt,
>>>
>>> You probably have an older ROM revision that'll only boot off sd0, found
>>> that out myself:
>>>
>>> http://www.glitchwrks.com/2022/09/19/sun-3-50
>>>
>>> Bit about booting off sd0 is near the bottom of the writeup.
>>>
>>> Thanks,
>>> Jonathan
>>>
>>> ------- Original Message -------
>>> On Saturday, December 24th, 2022 at 14:59, Kurt Nowak via rescue <
>>> rescue at sunhelp.org> wrote:
>>>
>>> I just finished installing SunOS 4.1.1 on my Sun 3/50 and the disk is
>>> set at ID 3 which in traditional Sun3 maps to sd6. My other Sun3's boot
>>> with >b sd(0,18,0) but the 3/50 wont accept that. I looked in the Sun FE
>>> handbook on bitsavers but couldn't find anything there unique to the 3/50.
>>> I'm pretty sure my SCSI chain is ok or the installation wouldn't have
>>> worked. Any clues?
>>>
>>> -Kurt
>>>
>>>
>>> _______________________________________________
>>> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
>>>
>>
>> _______________________________________________
>> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
>>
>
> _______________________________________________
> rescue list - http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sunhelp.org/pipermail/rescue_sunhelp.org/attachments/20230103/3c3a871c/attachment.html>