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General Hardware Discussions / pismo firmware downgrade
« Last post by bamdad on Today at 06:23:33 PM »
hi everyone,

a while ago when i was still using an IDE2SD adapter in my pismo i was having all sorts of sleep problems. after switching to an SSD it turned out to be the fault of the adapter, but in the process of debugging i had clumsily updated the firmware to 4.1.8..

this rendered the brightness control keys nonfunctional in OS 9.0.2.. which is annoying as hell because this is my go to backwards-compatible machine. they work fine in OS 9.1< and OS X but it sucks to have to do reboots just for this.

so.. there is a documented record of a downgrade of a MDD G4 here:

it seems i only need a firmware file. too bad these seem to be - according to the aforementioned description - some sort of executable files so even if someone has a non-upgraded pismo and would dump the OF contents for me, i would likely not be able to run it, or worse, brick my machine with it.

this is the point where my knowledge and experience runs out, so if someone has *any* ideas that would help, please share them..

thanks in advance,
I've been using a G4 Mac Mini with Mac OS 9.2.2 and recently purchased a M-Audio Transit USB audio interface but haven't been able to get it to work.

I've downloaded and installed the drivers from the "M-Audio Anthology Complete Set of all M-Audio Drivers & Utilities for Mac OS" thread here:,4438.0.html but as soon as I connect it via USB I get this error message, for the (ominous) USB device name of "Unknown"

When I open up the M-Audio Transit USB Settings Control Panel I see both the USB Driver, and Firmware versions showing up as <Not Available>

The device does appear in the Sound Control Panel but it's stuck on mute and if I try to unmute it goes right back to mute.

I did try to connect to device to my Raspberry Pi 4 and was able to both see it with the lsusb command and I can see the device being initialized:

[1826064.731714] usb 1-1.1: New USB device found, idVendor=0763, idProduct=2006, bcdDevice= 1.00
[1826064.731730] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1826064.731741] usb 1-1.1: Product: Transit USB
[1826064.731750] usb 1-1.1: Manufacturer: M-Audio
[1826064.892027] usbcore: registered new interface driver snd-usb-audio

I've seen people post about this particular USB audio interface working with Mac OS 9 and even on the same machine that I have (G4 Mac Mini) and was hoping someone here could help me to get the device working properly.
Mac CPU Upgrades / Re: Why it IS important...
« Last post by FBz on Today at 10:43:12 AM »
Yes robespierre, greatly appreciate the very thorough and concise explanation. Thank you.

*I was partially implying that with a multimeter, that it might be possible to detect a “complete & total” failure of individual capacitors - IF no continuity could be detected whatsoever, even while still in-circuit.

My ESR meter originally touted (before purchase) the ability to measure capacitors “in-circuit”… which was later found to be partly true, except that one leg of the capacitor had to be free / removed from the circuit board in order to do so properly. Now, I just remove questionable caps completely and then test with ESR meter.

AND Bolkonskij, Knez can possibly guide / help you overclock a somewhat lesser CPU for use while the Sonnet’s “in the shop”. I’ll be looking into this too but got sidetracked yesterday with discovery of overclocking a Quicksilver’s System Bus. (Off to pick up those resistors now.) ::)
aha, thanks for the clarification, robespierre! Yeah, i found the tiny chunk ejected from the top of the cap during cleaning.

So you'd attribute the problem to a failing PSU? I had mine die on me about a year ago and since replaced it. Maybe it took the caps with it?

Anyway, I'll look into getting it professionally replaced.
So, is it possible to simply check those tantalum capacitors (C2 and C4) using a
multimeter between ends for: (1). resistance, and/or (2). continuity
/ and thus… function? (Compared with others also present?)
Generally no, standard multimeters don't have the ability to measure capacitors in-circuit. There are specialized instruments called ESR meters that can do that (they inject a high-frequency signal, above 100 kHz, which gives a localized response of the capacitor without being affected by other components).

The dry tantalum capacitors are like little fireworks waiting to ignite: they contain a sintered mixture of tantalum and manganese dioxide, that can act as a type of thermite if it gets into "thermal runaway". The cap's normal operating temperature is up to 125°C, and ambient temperature around the heatsink is sure to be less than that. They are, however, sensitive to voltage fluctuations outside their design limit: even a brief spike beyond the safe level can cause them to ignite.

The switching regulator chip is likely fine; the black soot came from the capacitor. The actual silicon IC inside that package is very small: if it blew there would be a tiny chunk ejected from the top of the package. It would be a good idea to clean off all the soot with alcohol and a swab, including underneath as much as possible.
what happens when you doubleclick, does the icon of the app change to the "open" look or do you eventually even see its name in the menubar before the machine freezes?

what happens when you doubleclick a font suitcase? will that open?
So if I got you right, your Cube *does* start applications fine when booting with extensions disabled? If so, you probably have an extension conflict. Congratulations. This might take some time to figure out. (if you have RAM Doubler installed, try disabling that first. It's a troublemaker)

Do you have Macsbug installed? If yes, what's the error shown?
Hi there,

my G4-cube with 9.0.4. does not start any programs. I don't know where to search.

- The machine boots without an error.
- I can access the harddisk and the filesystem on any partition
- If I click on a program the machine just freezes. Mousepointer is still OK.

The machine shows that behavior before, but one  reboot and a diskcheck and everything works just fine.
Actually no reboot with diskcheck help. Starting without extensions works and I can make a diskchecxk, but the Partitions and the Filesystems are OK. Rebooting with the extensions and the machine look-up on start of the first program.

I already changed the RAM but this did not help either.

What is the problem here?

I had this before and made a clean install but that could not be the solution.

General Hardware Discussions / 150 MHz QS Bus Speed!
« Last post by FBz on September 16, 2021, 01:13:59 PM »
Overclocking Apple Quicksilver System Bus to 150 MHz?

Searching for instructions on overclocking the MDD 1.25 GHz & 1.42 GHz CPU’s
stumbled upon MacTron’s post,2903.msg18351.html#msg18351
Mentions increasing Quicksilvers’ bus speed to 150 MHz & found this bit of how-to instruction.

Might give this a whirl.
Seems easy enough and reportedly… with little resultant heat increase?
I’ve plenty of QS “A” MOBOs to test this on before same on “B” board.

Although I do wonder about this:
“Also take note that OSX will not recognize in these analyzes,
the overclock of the bus to 150MHz nor the real frequency of your processor.
Regardless, the important thing is that it works!”

Anyone here attempted this, in this manner / fashion?
Mac CPU Upgrades / Overstressed
« Last post by FBz on September 16, 2021, 08:49:12 AM »
“They do this when electrically overstressed, nothing to do with the heat sink at all.”

So, is it possible to simply check those tantalum capacitors (C2 and C4) using a
multimeter between ends for: (1). resistance, and/or (2). continuity
/ and thus… function? (Compared with others also present?)

AND, what about that LT 0621 “Buck Regulator”? Is that residual soot from the
tantalums overstressing or has it also suffered “overstressed” damage?

Like to see the backside too…
but might “rest” that Sonnet for a while and substitute a stock Apple 1.42 GHz
“out of an abundance of caution” /until the rare Sonnet can be checked.
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