I'm confused about the mnemonics of the assembly.  A typical statement
looks like

NOOP [-v,-h,-d] #640

Am I correct in concluding that -v and -h refer to the vblank and
hblank assertions?  In the program Timothy posted, every instruction
has the -d modifier.  Does this mean that some programs will never need
to assert the data line, or is this an oversight?  Also, how is cursor
control reflected in the mnemonics?

Finally, is it really a good idea for the mnemonics to reflect hardware
details?  I'm referring to the part in brackets here.  All a programmer
cares about is whether the signals are asserted; he shouldn't have to
care whether they are active low or active high.  I'm proposing
something like

NOOP [v,h] #640

where only the asserted signals are listed between the brackets instead
of stating whether the lines are high or low.  Timothy's program
already does this for returns.


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