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Maybe it's an early clone without auto-reset capability? In that case, try Reset or Ctrl-Reset. A photo of the motherboard would be helpful so we could see which clone it is (and by extension, which Apple II it is a clone of).

My Macintosh LC had me stumped. This started as a simple chip swap to replace a dead DFAC chip. Now that I’ve done that, I am now having sound volume issues: The startup chime is quiet. System sounds are quiet, even when I set the volume to 7 in the Control Panel. The sound is quiet from both...

I have motherboards, processors, graphics cards, and sound cards. I even see how current YouTube creators are currently trying to show how these items compare against others... which is why I would like to know of benchmarks and applications you wish other YouTubers used for their comparisons...

The new CPU works in my original system board. I believe the system board seller failed to adequately protect the compression connectors, and one/both were damaged in shipping. They were, after all, protected by pieces of paper. 🤦‍♂️

With my original system board, the light bar is red (the white light could be burned out… did SGI use bulbs and not LEDs?). With the new system board, I never see any lights.

I thought I should add some photos in case someone spits something that is amiss… Here’s my system model number, a CMNB015ANF250 (it’s one of the “green” Octanes): And the part number of the new system board: Here’s one of the compression connectors from two angles: And the other: And how...

First time SGI owner here with no previous experience with the platform... seems like I am jumping in head first as they say. I picked up an SGI Octane from a swap meet a couple weekends ago. It was the base model, but hey, I paid $75. I then found an IP30 030-0887-005 system board on Mercari...

Just saw another thread, with a picture… The opto-isolator is probably U1, U2, or U3. I can’t read the markings on the chips, so I’m identifying candidates by the number of pins on the chip only. Also, another candidate area is the LM393 near the output wires. If that comparator isn’t working...

Double-check that you didn’t accidentally desolder anything… ask me how I know. I’ve heard the opto-isolator is a common failure point in the LC power supplies. I’ve never seen a DynaCorp one in-person, so I don’t know which component that is.

Update: Sometimes it helps to set a project aside for a few weeks and then inspect your work again… I discovered that I had desoldered the leg of a resistor. The power supply is now functional, I tested it on the Performa 600 Logic board. I guess the relatively low resistances measured on the...

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Any updates on getting the CMS card to work with a BlueSCSI? I just picked up one of those CMS SCSI cards as part of a lot of Apple II cards.

Looks like I need to crack the power supply back open to double-check my work and check for damaged components inside. There was a power resistor in heat shrink that’s my number one suspect. The switching MOSFETs are my second suspect.

It’s for the Performa 600’s (which is a IIvx without cache support) PSU. The IIvx logic board I have is one I bought separately for comparative benchmark purposes.

On my livestream last night, I attempted to recap the Delta SMP-120EB power supply that was in my Performa 600. And after initially forgetting to reconnect the mains power connector, I measured 4.97V on the +5V standby output... yay! However, my joy quickly faded when I tried to power up the...

If anyone needs the cap list: https://wiki.console5.com/wiki/Delta_SMP-120EB

Yeah, Luke had the cap list and will update their Wiki when he gets a moment. He also let me know that this particular cap kit was initially made as a small batch, as they didn't have dimensions of the capacitors and made the kit by guessing sizes from pictures, but since the initial run sold...

I recently acquired a Performa 600, and it’s in need of a recapping. It has the Delta SMP-120EB power supply, which was also used in other Mac II series models, including the IIvx. My usual go-to, Console5, is out of stock and didn’t publish a list of capacitors for this power supply. Neither...

A second-sourced chip is one authorized by the original manufacturer to be manufactured on their behalf. I’m not sure if this started with IBM when they were in the release process for the IBM PC, or if there was earlier precedent, but some computer manufacturers were concerned with selecting a...