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David Cook's latest activity
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David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
Well, it was a team effort. You were passionate about getting the issue attention to be fixed, and @SuperSVGA found and analyzed the...
Jan 23, 2026
David Cook
replied to the thread
Mac Portable back cover side panel
.
Very nice!
Jan 22, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
Based on the work of @SuperSVGA and @JDW, I created a system extension that quiets the 10 second popping. You can use this with either...
Jan 22, 2026
David Cook
replied to the thread
Portable and PowerBook 100 Technical Note: PRAM, Backlight, and ROM Diff
.
Ahh! That answers that question. Thank you.
Jan 22, 2026
David Cook
posted the thread
Portable and PowerBook 100 Technical Note: PRAM, Backlight, and ROM Diff
in
Macintosh Portable
.
As I have been looking at the Macintosh Portable in more depth. I've run across a couple of pieces of technical information that may be...
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
That's good news. At least it isn't a hardware issue.
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
I do use the Desktop Mgr extension (to not have the desktop rebuilt when switching between 6 and 7). I don't think that is a cause. But...
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
I reduced my system down to a floppy disk and verified that it sleeps when booted from a FloppyEMU. The .dsk is attached. It is not...
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
I am rewatching your video to see if there is something obviously different about yours.
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
ZuluSCSI Compact RP2040 Lead acid. Battery 50-60% full based on battery desk accessory. No modem installed. October 2023 Androda...
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
I can confirm the same. Backlit Portable, PowerBook 7.1 control panel, AppleTalk off, power adapter unplugged, maximum conservation...
Jan 21, 2026
David Cook
replied to the thread
Macintosh Portable: "pop" noise every 10s from Speaker & Headphones
.
In System 7.0.1 the patch is located in the System file at 'lpch' #8 @$1206. In System 7.1, the patch is located in the System file at...
Jan 20, 2026
David Cook
posted the thread
Fixing a Macintosh Portable - What worked for me
in
Macintosh Portable
.
The Macintosh Portable has a certain cachet. It possesses an exquisite keyboard, a crisp screen, and a complete set of ports and slots...
Jan 20, 2026
David Cook
replied to the thread
Macintosh II / IIx Battery Holder Daughterboard Analysis
.
There are a number of modern battery holder choices available to the vintage hobbyist. Someone even recreated the Apple holder...
Jan 16, 2026
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