This document details the verified physical pinouts and logical port mappings for the Panasonic MN103S63G processor on the GCC-4241N hardware, specific to the optical drive's tray and status I/O.
| Component | Physical Pin | Logical Port / SFR | Action / Trigger |
|---|---|---|---|
| Tray Closed Switch (Back) | 184 / 173 | P13 (Port 1, Bit 3 - multiplexed with TX/P18) |
When the tray closes, it flips this bit. |
| Tray Open Switch (Front) | 192 / 181 | MONI7 (multiplexed with NTRYCL) |
When the tray fully ejects, it flips this bit. |
| Eject Button | 190 / 179 | MONI5 (multiplexed with DASPST) |
Pressing the button flips this bit. |
| Activity LED | 237 / 223 | P0 (Port 0, multiplexed with SERIAL) |
Driving this bit High/Low triggers the transistor base, lighting the LED. |