Latest activity
-
David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Here are the IDs (see U13H): Backlit portable: $A5 10100101 Upgraded original portable: $A3 10100011 PowerBook 100: $AD 10101101 -
David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.They're outputs, so they could just be floating. Thanks for letting me know. If I get a chance, I'll also take a look. It wouldn't...
-
AAppleTree replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.I wasn't sure where 74AC374's O0 to O4 (5 unused bits you referred to) were connected to. Traces from those pins went under 74AC374 and...
-
David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.I had no idea that the "backlight id" and "backlight brightness register" were implemented in such a rudimentary manner. There are 5...
-
David Cook replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Incredible write up! It explains so much. Based on your schematic, the digital potentiometer chip (U14G) is actually being used as a...
-
AAppleTree replied to the thread I broke and fixed Macintosh Portable (backlight). Attached backlight circuit schematic that I reverse engineered.Thank you for the warm welcome. I enjoy watching your videos. In fact, your video on the Portable backlight model taught me how to...
-
Trash80toG4 replied to the thread Radius Full Page Display for Macintosh 512ke/Plus - Cloning project possibilities?. -
-
About two years ago, I grabbed a second TRS-80 Model III, but this one has 48K and both of the 5.25" drives, so a lot more feature rich... -
PentaxEnthusiast replied to the thread What did you do to your computer today?.I'm looking for some fun math games to put on the G3 for my son to play that hopefully captures his interest better than GCompris...
