Thanks everyone, and thanks for the news, DJ.  Some new screenshots from the last two days of coding:

So! We have turn-taking, we have aiming and power-setting, we have parabolic motion (which was a massive, massive pain in the neck), we have collision detection, and a whole bunch of other cool stuff.  Other than debugging, important things still missing are the explosion at collision, health removal, terrain removal, and detection of turn-skipping and game-over conditions.

Great Kerm! I like the new screenshots

I have gotten myself a more decent nickname too q:
Oh yeah, AWESOME Kerm as always

True, although yours was not against the rules, since we have no swearing rules and it was not really offensive like if someone uses the N word.

Epic

These are the times when I wish I had a z80 calc...

This looks amazing, KermM!

Thanks everyone.

Correct parabolic motion! Explosions! Corrected explosion terrain removal! Tank collision detection! Tank health display! Game-over condition detection! Wooo.

Ah cool, that looks even better.

Also speed seems pretty nice.

Thanks! Even with the CALCnet 2.2 interrupt (of course) running, it was way too fast, so I'm artificially lagging the parabolic motion to make it more pleasing to the eye.  Same with the explosions.

awesome!  if it was played on a realy cal, would the screen scroll with the shot, or do you need all the calcs side by side?

Yunhua, each calculator has a copy of the same terrain; this isn't like Netpong, where the screens form one long playing field.

Done since yesterday:
:: Test and debug >2 players
:: Fix a small rendering glitch in parabolic motion
:: Display a ^ when the bullet is above the top of the screen
:: Fully repair collision detection

Still to do:
:: Make the angle/power interface appear at the bottom when it would otherwise cover the aiming tank
:: Display the username of the currently-playing tank, and of the winner.
:: Some multiplayer glitches appear present on game launch