Editing Macintosh SE/30 Troubleshooting (section)

=== Critical ICs ===
The initial startup is done by the Glue Logic chip UI8. I have not fully reverse-engineered its boot-up yet but have found all required chips.

The following ICs are critical for the boot operation of the system to get to the out of reset address toggling state.

* 68030 CPU (UK8)
* Glue Logic (UI8)
* PAL for RAM Signals (UH7)
* PAL for 68k/Video Signals (UI6)
* Resistor Packs for Pull-Ups (RP7 / RP9)
* Sound IC (UE10)
* ROM (J14) if you want to hear boot sounds, if not oscilloscope for address bus activity
To boot from only 5V you want to remove the sound chips too and with up the headphone port so you can still hear audio from the headphones:
[[File:SE-30 5v Power Bridge.png|thumb|312x312px|SE/30 5v Power Bridge]]
* Remove UB10 / UB11
* Jumper between UB11 pins 8 and 9 to short together analog and digital grounds (audio will be a little noisy). This also makes the S2 NMI button work again as once UB11 is removed the analog and digital grounds are separated and the reset button uses the disconnected ground.   '''''NOTE: S1 normal reset button won't work with UB10 removed as it is responsible for sensing that button and pulling reset low. So use S2 or disconnect power to reset.'''''