VBAR8
VBAR8 demo version 1.0 When I was done with VBARS, I was confident that I could optimize the graphics routine even more to make 8-pixel wide bars. I couldn't leave it until I had tried, and this is the finished product. 8 bars, 8 pixels wide, fully masked and animated. Enclosed in this archive is the demo executable, this text-file and the source-code (FASMW-ZX was used). The idea of the demo is simple, and has been done on other platforms several times. Simply put: the graphics is only one line worth of hires data, drawn repeatedly down the screen, data is added to the line along the way. This creates an effect of vertical bars, which would take way too much memory and CPU-cycles to draw in a straight-forward way. I wanted to make this in only 1k, as that is the common ground for all ZX81-computers. I've tested this version to work on: - EightyOne emulator, 1k or 16k RAM, PAL or NTSC, WRX - ZX81 with internal 16k WRX RAM and 8k UDG at 8192, PAL - ZX81 (bad internal memory) and ZXpand, PAL Sorry, I do not have a working unexpanded ZX81... It should work on any unexpanded ZX81, or with memory expansion that is WRX- modified. Enjoy the show, and be inspired by the source-code! 2015-10-22, Adam Klotblixt (NollKollTroll)
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