[rescue] Sun 3/50 scsi boot string

[Kurt Nowak]

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
>>
>>
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>>
>
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