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Geeky things I'm up to

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EP X positioning code

Greetings to the 20 readers who visited yesterday.The Expensive Planetarium drawn using 256 8x8 pixel tile sprites, with each sprite having 8 "stars" in a quincunx pattern either on or off. (Actually, there are two sets of tile sprites, odd & even, to make up for the 160 positioning in 320 mode.) The actual star map is 90 rows of 256 tiles (each tile is 1 byte). This makes the starmap effectively 2048x720 pixels (360x180 degrees).On the 7800 tiles are drawn using 5 byte DL entries. Each

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Expensive Planetarium

The original PDP-1 SpaceWar! had an accurate starfield, termed the Expensive Planetarium. I want to add the same thing to SpaceWar! 7800. So far I've translated the Yale star information into quincunx sampled tile lists. The current annoyance is the X/Y position to DL entry code. It's not hard code, just annoying and tedious, and I don't seem to have the necessary desire & drive.

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