Wednesday, October 11, 2006

First Post

Well here we are, first post on a journey back into time.

It's been around 20 years since I last touched a real Spectrum to program it, but here I am back again!!!

Mike has given me this chance to put together a Spectrum version of Xenon TriOxide, so I've been re-acquainting myself with an old friend.

The game is a scrolling shoot em up, and the best scrolling method on the Spectrum was used in Cobra, where the screen is redrawn every frame by "push"ing the map onto the screen.

The technique is fairly simple the stack pointer is set to a screen address and then code is executed which draws the screen, this code is created procedurally from the game map, it is a simple tower of push instructions, in psuedo code it is reasonably simple

This is the fastest way to redraw the screen.

Tomorrow I'll talk about how to synchronise the screen so that we don't get any flicker.

Comments:
Nice that you are going to program the Spectrum version! This game will be tremendous in the +4, C64 and Spectrum.

Waintin for updates in your blog. Who is going to do the gfx for the spectrum?
 
Thanks for the encouragement :)

No graphics just yet as I've a lot of code to do before we get to that stage.

I'll keep you posted thoug
 
Go Russell go! I wanna see how it will run, the early stages too! Occasionally, turn the chair and slap the other fruit that is coding the other two versions! :D
 
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