Posted By
IstvanV
on 2017-07-05
15:23:19
|  Re: ep128emu is updated!
The NICK chip has both advantages and disadvantages compared to TED, but in the particular case of character mode this game, it is mostly disadvantages: there is no hardware horizontal smooth scrolling, and no separate color byte for each character. Thus, the graphics had to be limited to 4 colors, and all characters are low resolution. On the other hand, the start address of the screen can be anywhere, and not just at 2K boundaries, this allows for faster scrolling without having to move large amounts of data. Smooth scrolling was achieved by using multiple character sets, and translating pairs of the original 40 characters to 174 characters with a table. The remaining 82 characters are used by sprites.
By the way, the port is mostly complete, it still needs some tweaking and better sounds, but it is playable.
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