tests/1001_stack_operations.pvvs

# This test verifies operations under the Stack IMP ([Space]).

SSSTSSSSSTN     | ST: Push +65 (ASCII A)
SSSTSSSSTSN     | ST: Push +66 (ASCII B)
SNS             | ST: Duplicate TOS
TNSS            | IO: Output character
SNT             | ST: Swap TOS and NOS
SNN             | ST: Discard TOS
TNSS            | IO: Output character
NNN             | FC: Terminate program