Some progress!
Apple Developer technote for this machine contains block diagram and describes *some* of the hardware. Found here:
http://developer.apple.com/legacy/mac/library/#documentation/Hardware/hardware2.html
It tells us that "The Display is a 9.5-inch flat panel film super twist nematic (FSTN)
dual-scan liquid crystal display (LCD). It provides 640-by-480 2-bit per pixel resolution, is
capable of displaying 4 levels of gray, and has on-demand cold cathode fluorescent lamp
(CCFL) backlighting.
The video implementation on the PowerBook 150 is similar to the video on the
PowerBook Duo 230. The video RAM is a 128K x 8-bit device that stores the data required
to update and refresh the flat-panel video display. The VRAM for the PowerBook 150 is
mapped to locations $6000 0000 through $6080 0000, as it is on
the PowerBook Duo family. The display hardware supports 1-bit and 2-bit per-pixel
grayscale. The value for the PowerBook 150 panel ID is 4."
More importantly, I learned that the "GSC" chip stands for Grey Scale Controller and is actually a Chips and Technology Video Controller chip. In most cases, I think they used the 65525, but I will confirm from the hardware. If that is the case, I have the Application notes with pinouts for that chip, which will tell me the pinouts on the LCD ribbon...
Apple Developer technote for this machine contains block diagram and describes *some* of the hardware. Found here:
http://developer.apple.com/legacy/mac/library/#documentation/Hardware/hardware2.html
It tells us that "The Display is a 9.5-inch flat panel film super twist nematic (FSTN)
dual-scan liquid crystal display (LCD). It provides 640-by-480 2-bit per pixel resolution, is
capable of displaying 4 levels of gray, and has on-demand cold cathode fluorescent lamp
(CCFL) backlighting.
The video implementation on the PowerBook 150 is similar to the video on the
PowerBook Duo 230. The video RAM is a 128K x 8-bit device that stores the data required
to update and refresh the flat-panel video display. The VRAM for the PowerBook 150 is
mapped to locations $6000 0000 through $6080 0000, as it is on
the PowerBook Duo family. The display hardware supports 1-bit and 2-bit per-pixel
grayscale. The value for the PowerBook 150 panel ID is 4."
More importantly, I learned that the "GSC" chip stands for Grey Scale Controller and is actually a Chips and Technology Video Controller chip. In most cases, I think they used the 65525, but I will confirm from the hardware. If that is the case, I have the Application notes with pinouts for that chip, which will tell me the pinouts on the LCD ribbon...