Lady Bug is the port of an computer game that I wrote
for the Sharp MZ-80K in the year 1982. It is programmed in Z80-assembler. No colors,
no high resolution, and only monophone sounds...
In order to obtain a display without flickering, double buffering was used.
The contents of the second screen memory was copied en block to the original screen memory.
This copy operation was done, when the cathode ray jumped from the lowest
row to first row. Since this time only allowed the copying of one third of the screen contents,
three copy operations were needed...
The program is still available for download. You can find it
at the page
www.sharpmz.org. The exact link is