I'll be building this computer in a few phases. The first phase will consist of:

• 65C02 CPU
• RAM
• ROM
• RS-232 serial port to act as a terminal
• a 6522 chip for some additional I/O and timers
• memory decoding and other glue logic

I currently have all of this built, except for the serial port. I hooked up some LEDs to one of the ports on the 6522 so that I can see that the code is running. Here's the result so far:

It worked on the first try!

Next step is to get the serial port wired up, and then to write some simple test programs to make sure the hardware is working as expected. Currently I'm only using the CPU, ROM, 6522, and a bit of address decoding to make things work. I will need to test the RAM, the ROM bank switching, and a few other things before I'm comfortable calling this stage done.

Once the hardware is built and tested, I will focus on writing a simple terminal monitor program so that I can easily upload code to the computer without having to re-flash the ROM chip each time.