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by robespierre
Thu Nov 16, 2017 9:41 am
Forum: SGI: Hardware
Topic: Octane: System board NIC diagnostic *FAILED*
Replies: 3
Views: 76

Re: Octane: System board NIC diagnostic *FAILED*

The NIC is the Dallas iButton that supplies the system ID. You'll find it on the corner of the IP30 board (or the empty socket where it should be...)
by robespierre
Mon Nov 13, 2017 2:00 pm
Forum: Everything Else
Topic: CRT Projector for Bedroom Entertainment Setup?
Replies: 22
Views: 375

Re: CRT Projector for Bedroom Entertainment Setup?

Projection CRTs are more likely to be replaced for other reasons than just burning out. Burn-in on the phosphors is a big problem and it affects these tubes more than regular display units. You should be very careful about on-screen display characters, network bug logos, computer menus, or anything ...
by robespierre
Sun Nov 12, 2017 11:33 am
Forum: Everything Else
Topic: CRT Projector for Bedroom Entertainment Setup?
Replies: 22
Views: 375

Re: CRT Projector for Bedroom Entertainment Setup?

Projectors have a specified throw distance, which is the distance between the lens and screen at which it can focus. This will be specified with the lens (or with CRTs, lenses) that the projector can use. Unfortunately, from what I can see of some Barco literature, they choose to only print the scre...
by robespierre
Fri Nov 10, 2017 10:55 pm
Forum: Everything Else
Topic: An item is only ever worth what someone is willing to pay... :)
Replies: 28
Views: 597

Re: An item is only ever worth what someone is willing to pay... :)

Very true, and I'll add a very important price factor, which is whether an item is the last or greatest version that was produced. It makes a machine much more desirable to hobbyists because they know it is better than the others of the same type or platform. For example, the Macintosh IIfx and SE/3...
by robespierre
Wed Nov 08, 2017 12:13 am
Forum: SGI: Hardware
Topic: R5000PC to R5000SC?
Replies: 4
Views: 158

Re: R5000PC to R5000SC?

I assume you mean for an Indy IP24; I don't think the O2 processors went as low as 150 MHz. As far as I know, all R5000 chips contain secondary cache controllers. The issues you may face are: 1) The processor cards sold as R5000PC may not have been fully tested and qualified for use with external ca...
by robespierre
Tue Nov 07, 2017 3:53 pm
Forum: SGI: Computer Graphics
Topic: Maya Irix Software Render scene
Replies: 24
Views: 687

Re: Maya Irix Software Render scene

but one day I close the console and I can't find the way to re-open it

It should be under the System toolchest
by robespierre
Fri Nov 03, 2017 1:17 pm
Forum: SGI: Hardware
Topic: ColorLock internals
Replies: 15
Views: 227

Re: ColorLock internals

the device appears to be a dual phototransistor, and the capacitor is between the shared collector and one of the emitters
by robespierre
Fri Nov 03, 2017 6:34 am
Forum: SGI: Hardware
Topic: ColorLock internals
Replies: 15
Views: 227

Re: ColorLock internals

I have not seen the circuit board in the ColorLock, but simple devices have simple schematics, which can be reconstructed in single-digit hours of time, with the right approach. Sometimes the value is not critical, but knowing this depends on its role in the circuit. For example, by knowing that the...
by robespierre
Fri Nov 03, 2017 2:32 am
Forum: SGI: Hardware
Topic: ColorLock internals
Replies: 15
Views: 227

Re: ColorLock internals

Small SMD capacitors are rarely marked in any useful way. The only means of replacing it are
1) Taking a working unit, removing the capacitor, and measuring it
2) Guessing a value from the schematic and putting one in
by robespierre
Thu Nov 02, 2017 10:33 pm
Forum: Miscellaneous Operating Systems/Hardware
Topic: Xerox Alto Restoration
Replies: 37
Views: 2323

Re: Xerox Alto Restoration

Our intrepid explorers put their experience to work restoring an Alto that was stored in a barn:



by robespierre
Sat Oct 28, 2017 11:43 am
Forum: Everything Else
Topic: What pointless thing are you doing right now?
Replies: 313
Views: 18780

Re: What pointless thing are you doing right now?

I thought he said, "God forbids networking"? Good luck with that...
by robespierre
Thu Oct 26, 2017 10:00 pm
Forum: IRIX and Software
Topic: Indigo Fresh Install Problems
Replies: 17
Views: 605

Re: Indigo Fresh Install Problems

6 feet is about the limit for single-ended 10 MHz SCSI. The CDROM drive will probably negotiate at 5 MHz, though, so it should be okay. I agree that shorter lengths are more reliable (the long cables like 6 or 10 feet are mainly designed for differential systems, which can be much longer because of ...
by robespierre
Sun Oct 22, 2017 8:34 pm
Forum: Miscellaneous Operating Systems/Hardware
Topic: Xerox Alto Restoration
Replies: 37
Views: 2323

Re: Xerox Alto Restoration

Smalltalk-76 running again on the Alto:
http://www.righto.com/2017/10/the-xerox ... iting.html
by robespierre
Sat Oct 21, 2017 4:38 pm
Forum: Getting Started, Documentation, Tips & Tricks
Topic: New O2 owner. It is so cute!
Replies: 7
Views: 303

Re: New O2 owner. It is so cute!

Partition number 7 is conventionally an option (non-bootable) partition. The "partition" that spans the disk is number 10, also known as /dev/dsk/dks0d4vol once Irix is running ("vol" stands for "the whole volume"). Trying to use the whole disk as if it were a filesyste...
by robespierre
Sat Oct 21, 2017 1:34 am
Forum: Getting Started, Documentation, Tips & Tricks
Topic: New O2 owner. It is so cute!
Replies: 7
Views: 303

Re: New O2 owner. It is so cute!

fatalhalt wrote:I was impressed that the PROM can read EFS file system directly

It can't do that on its own; it needs sash to read EFS or XFS. This is similar to second-stage boot loaders for SunOS and other unix systems.

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