"fbase", 1,0, -1, 1, // starbase
"fconst", 1,0, -1, 0, // construction ship
"fconst", 1,0, -1, 0, // second construction ship
"fscout", 1,0, -1, 0, // scout
"fmining", 1,1, -1, 0, // mining stations
"fturret", 2,1, 4, -3, // basic mining defense
"forbital", 1,1, -1, 0, // build an orbital station
"ffreight", 2,0, -1, 0, // mining freighter - two freighters for each station
"fyard", 1,0, -1, 0, // basic shipyard
"fdestroy", 2,0, 4, -2, // Defiant
If the tech level field is positive it defines a tech level.
If it is negative it builds only up to that level.
If it is zero the unit is unaffected by tech level.
In the above example the starbase defines a tech level of 1 right from the start. The turrets only get built if you're on tech level 1, 2 or 3, the defiants only on levels 1 and 2.
So you could put -1 on all the TOS ships and put 2 on the first TNG ship.
