The first thing I always do is power on the device.
I was greeted with this screen.
I wasn't quite sure what to do, so naturally I disassembled the machine and took a look inside.
The logic board looked surprisingly clean. Finding no obvious issues with the motherboard, I proceeded to find some documentation on the internals of the Macintosh SE. Below I list some documents which proved rather helpful.
- Macintosh Family 2nd Edition May 1990
- Motorola 68K Microprocessor Datasheet
- Macintosh SE Schematics and Pinout
- Macintosh Family Hardware Reference
With respect to the large body of knowledge that I gleaned from these resources, the following pieces of information largely determined my next steps.
- The CRT will behave like a 100KV capacitor if improperly handled
- The Macintosh SE has a Processor Direct Slot - The 1980s equivalent of a PCIE slot
- The Macintosh SE System I kernel partially resides on board in a ROM
- The SE uses a BBU which is essentially a very primitive MMU/bus arbiter
To Do List
- Remove CopyRighted Material and insert legal reproductions
- Refresh Board
- Itemize components on board
- Remove all capacitors and Resistors
- Scrub Board with Alcohol
- Install newly purchased components
- Add updates to display controller
- Display Text
- Take text input from keyboard - (also useful to gain experience with UART for writing automatic C based prober in the future.)
- Test SUMP2
- Design PCB for FPGA with memory and Voltage level shifter
- Design PCB that house the HIGH and LOW roms and captures contents to verify.
If no success by this point:
- Determine Faulty component and replace - if not replaceable logic, wrtie FPGA implementation, reflow board, and seat FPGA into logic board.)