After working on the CPU core a few hours to get started, I was able to complete my initial objectives:

• The CPU is able to process reset (i.e. fetch reset workspace pointer and initial program counter)
• The CPU can fetch instructions
• It can execute the unconditional branch instruction

Below is a picture from one of the first simulation runs. There are two instructions, like this:

5678 JMP >567A   * effectively a NOP
567A JMP >5678   * branch back to previous line