I've finished the stack code including pop,push,call,return.  So that brings me to all of the following instructions implemented:

• move
• load (immediate)
• memload (immediate)
• memread
• memwrite
• jump
• branchif1
• pop
• push
• call
• return
• rotateleft

That should give me quite a lot to make some real programs now (on top of the inherent functions of the ALU).  I'll need to bring up some better debug tools next.  Memory inspection.  Probably enhance my bootloader.  Maybe start on an emulator.