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Credits :
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Pokefinder.org
Production Info
Submitted by KingTut on 15 March 2020
| Demo was coded on a C64 bread-bin model, coded in 6402 machine code of course. I didn’t have an Assembler app so I used the built in disassembler / monitor on an Action Replay card which I loved! I created graphics and code, the main Atari graphic was created in a paint app on the c64 (can’t recall the name) it was made as a single bitmap graphic including the black around it to act as a mask for the colour bars in the logo. The colour bars were created using vertical raster scan lines via IRQ interrupt by changing the background colour ref on each vertical line, reading the colour data from an array and cycling through it on loop. The scroller at the bottom was using built in hardware sprite size doubling and exploiting the VIC chip overscan bug by rapidly switching modes and timing it carefully using NOP operations to make it stable, that way all sprites could be placed in the overscan boarder area as static blocks and treated as a biplane by writing the typeface bitmap data to them. I think I made the typeface too, the scanline effect in the typeface was achieved by skipping every other vertical line to give the lines in the typeface to make it look less blocky (from the sprite doubling effect) which was common with demo coders at the time. It was 30+ years ago and those are my distant memories of it, not the best demo but of it’s time, don’t come after me :-) |
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