Professional IRIS restauration

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jan-jaap
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Re: Professional IRIS restauration

Unread postby jan-jaap » Wed Jul 01, 2015 1:33 pm

robespierre wrote:that's a surprising amount of garbage on the console, I usually only see one or two chars of noise before it settles down on a sun 3/80 or 4/25. I never used the twin tower on serial though.

Solved it. My IRIS console cable has the hardware handshake lines wired, but PUTTY wasn't set to use flow control. I disassembled a good bit of the IP7 PROM many years ago, and I remember that the very first UART output used different routines than the rest. I've long retried the PC that ran the IDA software so I can't look at these listings right now, but I guess that's what bit me here.

The panel with the hex display and the mode switches is now connected, so DIAG is enabled. Now I get :

Code: Select all

Version 4D1-3.1 PROM IP4 OPT Thu Dec  8 16:12:10 PST 1988 SGI

Memory address pattern test from A0000000 to A02FFFFF
Initialize local hardware!
Sizing and Clearing Memory!

Parity mechanism                PASSED.
Data and Instruction Caches     PASSED.
CPU Address Translation (TLB)   PASSED.
VME interface                   PASSED.
Non-Volatile memory             PASSED.
Timer/Clock                     PASSED.
DUARTs 0, 1, and 2              PASSED.
Local I/O Interrupt             PASSED.
Floating Point Unit             PASSED.
SCSI controller                 PASSED.
Initialize local hardware!
Sizing and Clearing Memory!


System Maintenance Menu

1) Start System
2) Install System Software
3) Run Diagnostics
4) Recover System
5) Enter Command Monitor

Option?

That's more like it :)

PS: this thing is 25+ years old, and unlike an Indigo it doesn't hang on an empty battery. Who knows, maybe it still works :lol:
:PI: :Indigo: :Indigo: :Indy: :Indy: :Indy: :Indigo2: :Indigo2: :Indigo2IMP: :Octane: :Octane2: :O2: :O2+: Image :Fuel: :Tezro: :4D70G: :Skywriter: :PWRSeries: :Crimson: :ChallengeL: :Onyx: :O200: :Onyx2: :O3x02L:
To accentuate the special identity of the IRIS 4D/70, Silicon Graphics' designers selected a new color palette. The machine's coating blends dark grey, raspberry and beige colors into a pleasing harmony. (IRIS 4D/70 Superworkstation Technical Report)

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Re: Professional IRIS restauration

Unread postby jan-jaap » Thu Jul 02, 2015 12:53 pm

Next up, I loaded all boards of the 4D/70, measuring the power consumption (from the wall) each time a board was added.

With all boards installed, power consumption hovers around 400W @ 230VAC. Which means a little over 300W (from the wall) goes to the 5V rail, worst case scenario. Assuming 80% PSU efficiency, some 250W (50A) is a more realistic number. In either case, it is well below my 150A budget :) The PSU does not make any nasty noises like the original LH Research PSU did.

This is what it looks like right now:
DSC_5302.JPG

Don't worry about the pixel faults on the screen, it's the LCD which is faulty.

Something else I didn't expect: airflow is top-down, like an Onyx2 deskside. The exhaust is at the bottom of the sides of the main tower. So my plan to install a thermal kill switch above the card cage will have to be re-thought.

I'm quite happy with my progress so far. I've solved two of the problems of this system: a faulty PSU and a faulty blower. I will still have to deal with a sick GM1 board and the system disk doesn't spin up.

Now that I've established that (1) the original PSU was faulty, and (2) the Power-One PSU can handle the system, I'll redo the wiring harness to the PSU properly and drill some holes in the chassis to mount the PSU.
:PI: :Indigo: :Indigo: :Indy: :Indy: :Indy: :Indigo2: :Indigo2: :Indigo2IMP: :Octane: :Octane2: :O2: :O2+: Image :Fuel: :Tezro: :4D70G: :Skywriter: :PWRSeries: :Crimson: :ChallengeL: :Onyx: :O200: :Onyx2: :O3x02L:
To accentuate the special identity of the IRIS 4D/70, Silicon Graphics' designers selected a new color palette. The machine's coating blends dark grey, raspberry and beige colors into a pleasing harmony. (IRIS 4D/70 Superworkstation Technical Report)

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sgifanatic
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Re: Professional IRIS restauration

Unread postby sgifanatic » Fri Jul 03, 2015 12:23 pm

Oh wow, thanks for the details and the great pics! Really having a fab time following your progress with this.
--
:Octane2: 2 x :Octane: 2 x :O2: 4 x :Indigo: :Fuel: 20 x :Indy: 15 x :Indigo2: :Indigo2IMP: BeBox133 NextCube 3 x NextStation PcJr Gateway486DX25 XTClone8088 ATTPC Tandy100 Atari800 Atari1040ST C64 Amiga CommodorePET Kaypro 2 x Osborne RS/6000 PS/2Model60 SparcStation5 AppleLisa SE/30 2 x MacColorClassic MacClassic 3 x FujitsuStylistics CompaqPortable Audrey ToshibaLibretto20 Tandy1400LT MacClamshell 2 x PowerMacG4Tower PowerMacG4Cube Dozens x x86/ARM/tablets/embedded and assorted...

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Re: Professional IRIS restauration

Unread postby robespierre » Fri Jul 03, 2015 12:47 pm

the thermal switches on top of the card cage will still trip if the blowers fail. whether that's fast enough is another question.
the other problems you're having: those old Wren drives really suffer from stiction, try all the old methods like putting them in the freezer and tapping them on the side with a screwdriver handle. The GM1 failure could be one of the sockets: those LGA sockets kind of suck and can get misaligned. Fortunately there's a debug port right on the GM1.
:PI: :O2: :Indigo2IMP: :Indigo2IMP:

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Re: Professional IRIS restauration

Unread postby Ryan Fox » Tue Jul 07, 2015 4:48 am

It would be great to maybe host a site providing a video / content rich experience demonstrating each of these systems. From hardware , to booting and running demos :)
MAYA, nut-
:Octane2: :Octane2: Octane 2 R14k 600 V12 4GB, Octane2 R14K 600 V10 1GB ,
:Onyx2: :Onyx2: Onyx2 IR3 4GB Quad R14K 500 DIVO, Onyx2 IR Quad R12K 400 2GB,
:Indigo2: SGI Indigo 2 R8K75 TEAL Extreme 256MB,
:Indigo2IMP: SGI Indigo 2 R10K 195 Solid Impact 256MB, MAX Impact Pending
,
Apple G5 Quad, NV Quadro 4500 + 7800GT, 12GB RAM
Sun Blade 1000 Dual 900 XVR 1000 4GB
Sun Blade 2000 Dual 1200 XVR 1200 8GB

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Re: Professional IRIS restauration

Unread postby chicaneuk » Tue Jul 07, 2015 5:54 am

There was a chap who was uploading some great videos on youtube but they seem to have dried up in recent years.. I'd be amazed if he wasn't a user on here? Username on youtube is jpkiwigeek and an example of one of his videos is here:

:Indigo: :Indigo2: :Indigo2IMP: :Indy: :Octane2: :O200:

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jan-jaap
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Re: Professional IRIS restauration

Unread postby jan-jaap » Fri Jul 10, 2015 1:21 am

Ryan Fox wrote:It would be great to maybe host a site providing a video / content rich experience demonstrating each of these systems. From hardware , to booting and running demos :)

We'll see, maybe once it's back up and running. I also want to build my own site for my collection so I don't want to scatter all my content all over the web either, because I will have nothing left.

Back on topic: the system as I got it had an 8MHz IP4, but I still had a spare 12MHz IP4. Thought I'd give that a spin. Now, I've wondered whether the realtime clock of these things is powered by a small nuke, because the original clock still works in all of my Power Series, unlike just about every other SGI I own. But in this particular IP4 it was dead.

This is what I'm talking about:
timekeeper.jpg
timekeeper.jpg (102 KiB) Viewed 464 times


Underneath that Sony CXK5816PN-15L static RAM (which holds PROM variables), a Dallas is hiding. It's a DS1216B (this photo is leeched from the 'net):
DALLAS_DS1216.jpg
DALLAS_DS1216.jpg (25.1 KiB) Viewed 464 times


Basically this clock sits in a RAM socket and turns the RAM chip into NVRAM. Now, when it's dead, you have to key in all PROM variables every time the system powers on which is a major pain in the behind. You can still buy these things from Farnell while supplies last (they have 13 as we speak), but at nearly €50 a piece :shock: Should I buy one for my 4D/70, 4D/440, 4D/380 and Crimson, and maybe a spare for good measure? Nah, didn't think so either. Time to bring in the Dremel 8-)

I'm not a stranger to this job, but I like to know where to start grinding away. Sometimes the datasheets give you a clue where the Vbat wires must be hiding, sometimes you can find a photo on the internet. Not for a DS126, though.

Luckily, the wife of my colleague works in the Xray department of the local hospital :D
xray2.jpg

Which finally answers my questions about the longevity of these things ... not a nuke, but two batteries.

PS: since I had the opportunity, I had the Dallas chips of an Indy, Indigo2, O2/Octane and O200/O2K X-rayed as well. That will be the subject of another post.
:PI: :Indigo: :Indigo: :Indy: :Indy: :Indy: :Indigo2: :Indigo2: :Indigo2IMP: :Octane: :Octane2: :O2: :O2+: Image :Fuel: :Tezro: :4D70G: :Skywriter: :PWRSeries: :Crimson: :ChallengeL: :Onyx: :O200: :Onyx2: :O3x02L:
To accentuate the special identity of the IRIS 4D/70, Silicon Graphics' designers selected a new color palette. The machine's coating blends dark grey, raspberry and beige colors into a pleasing harmony. (IRIS 4D/70 Superworkstation Technical Report)

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Re: Professional IRIS restauration

Unread postby Trippynet » Fri Jul 10, 2015 3:30 am

jan jaap wrote:PS: since I had the opportunity, I had the Dallas chips of an Indy, Indigo2, O2/Octane and O200/O2K X-rayed as well. That will be the subject of another post.


Nice, looking forward to that. Anything which helps our understanding of these things has got to be a good thing!
Systems in use:
:Indigo2IMP: - Nitrogen: R10000 195MHz CPU, 384MB RAM, SolidIMPACT Graphics, 36GB 15k HDD & 300GB 10k HDD, 100Mb/s NIC, New/quiet fans, IRIX 6.5.22
:Fuel: - Lithium: R14000 600MHz CPU, 4GB RAM, V10 Graphics, 72GB 15k HDD & 300GB 10k HDD, 1Gb/s NIC, New/quiet fans, IRIX 6.5.30
Other system in storage: :O2: R5000 200MHz, 224MB RAM, 72GB 15k HDD, PSU fan mod, IRIX 6.5.30

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Re: Professional IRIS restauration

Unread postby foetz » Fri Jul 10, 2015 10:34 am

xray, haha nice :P
if anyone is thorough then you :D

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Re: Professional IRIS restauration

Unread postby Pontus » Sun Aug 02, 2015 11:41 am

Do you know what else uses the Mighty Mite?

Hint: It's big and orange:
Image
Yup, that is my DECSYSTEM 2020
Image
The connector layout is a little different, I suppose they were made to customer specs.
:Onyx2R: :IRIS3130: :Crimson: :4D310: :Onyx2: :O2000: :O200: :PI: :Fuel: :Indigo: :Octane: :O2: :Indigo2IMP: :Indigo2: :Indy: :1600SW: :320: :pdp8e:
:BA213: <- MicroVAX 3500 :BA213: <- DECsystem 5500 :BA215: <- MicroVAX 3300
Pictures of my collection: www.pdp8.se

Al_Kossow
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Re: Professional IRIS restauration

Unread postby Al_Kossow » Sun Oct 02, 2016 7:40 am

ah.. the joys of fixing switching power supplies.

I just repaired four MM700 Mighty Mites this weekend. All filter caps on the main 5v supply
read <100uF on a capacitance meter when they should have been 19000. They are very old units, a little
older than the one in the KS10. It is also common for the high voltage caps to fail. The first thing
I would check with a dead switcher are the caps. An ESR meter is extremely handy for doing this in circuit.

All four squeel at different current levels on an active load, but they quiet down at >10A. You can see the
noise level on the main output vary as you apply load.

The squeel seems to be coming from the step down transformer. I'm guessing resonance between the sheets
in the core. You can get the level to vary applying pressure to the transformer core.

Schematics are pretty much impossible to find. I spotted a manual that Tucker had listed on eBay, and that
will be scanned and up on bitsavers when it comes in. If you dig around, people have identified the pinouts
on the DB connector, but the information isn't in a single place.


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