Added notes to the isa spec
Update isa doc
Update isa_spec.md
Added boolean operations to isa
Merge branch 'feature/isa' of github.com:willprice/vhdl-computer into feature/isa
Tidy line endings
Added arithmetic instructions
Added basic memory access instructions
Update isa_spec.md
Results of pair programming
Merge branch 'feature/isa' of github.com:willprice/vhdl-computer into feature/isa
Add new testbench for the dtype flipflop