BAD AON - Bad Apple on four old phones with 7-segment displays 

pwm?

Software PWM indeed, 2-bit brightness per segment. The mux rate here is 2160 Hz, i.e. 9 digits * 60 frames per seconds * 4 (the animation itself is at 30 FPS, tho). It helped a lot compared to just 1-bit, introduced a kind of a magic feel.

@@shiru8bit I recently learned that the original Game Boy did its grayscale, er, greenscale using a variant of PWM as well. Interesting to see it in action to this date!

I had a feeling you'd have to do software PWM. Hooray for analog :⁠-⁠)

Thanks! Actually didn't expect it, there were many cool wild entries!

@@shiru8bit Even better!

I actually did it in a modern way, with Reaper and a couple of my custom VSTs that then exported the music data in an appropriate format.

They're a bit faster (4 MHz), but there is only 2K RAM. Demo uses a 64K ROM, tho, which was a regular feature for these. Yes, it is possible to port it to a 48K Spectrum, but don't forget, there is four phones, so 64K*4 = 256K ROM in total. So either four 48K Spectrums, or an expanded model. It may get sqeezed into 128K with a bit of extra compression, though.

@@shiru8bitMakes sense. Although, wouldnt it also be possible to split the animation into 3 parts? As you said, it could be possible to compress it to 128K and 3 X 48 is 144

@@Wii1235 yes, it is possible to split it into parts. Not makes much sense for a viewer, though, to play a 4 minute song in 4 separate loads. It has been done before, though, with one of the Sega Genesis Bad Apple renditions that came as two separate 4M ROMs.

@@shiru8bittrue. Another option could be to reduce the frame rate to something around ~15FPS and to have really simple audio. Any option would still be impressive since it would be running on one of the cheapest computers from 1982

Данное творение родилось из шуточного комментария, что, мол, а теперь покажи Bad Apple на АОНе. И я DOOMаю, что-то, что можно описать как DOOM, тоже вполне возможно! Спасибо за идею!

Mathematically yes, but traditionally it is called 7-segment, because there is a different type of display actually called 8-segment one (with an extra vertical segment inside the 8 shape).

@@shiru8bit 7+1 segment then? Still more resolution!

I experimented with the number of displays at first, and came to conclusion that at least 16 is needed (2x8 chunks), but 64 is better (4x16). I believe it would be still possible, but insanely tiresome to get it all captured and synced up. I had a lot of trouble with just four so far. But yeah, maybe sometime I'll give it another go!