Open to marine bands only on transmit means just that, you can only transmit on marine ssb frequencies. You are able to listen to most others and a simple software
mod will open it up but i recommend you have a tech do that as I do not have the clone cable or software
needed. If you have a ham license
it would make sense to do.
Have no idea what year it is but does not look too old and is very clean
Amp draw depends on transmit power and other variables but it does draw a fair amount when transmitting, you can check the icom site for specs i do not have that info right off.
Yes it will work
with a pactor modem
I have one with the pIII upgrade for sale as well however I do not have all the cables
needed but they are not hard to get nor expensive
If you want it I would need a deposit. But you are welcome to pick it up while in town.
I am going to list both these on ebay this afternoon I need to get these sold