Product title:
UPKR promo
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Author:
RMDA 
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Comment shown on the compo slide:

ZX Spectrum 48 + AY tech demo

14 standard ZX Spectrum screens (96 768b) + AY (6 887b) 
+ some XXXb of code = 43 239b of crunched data.
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Coment for orgs:

Duration: ~4.30 min. then loop. 
AY music + some beeper noise.

Video:

HD : https://emulate.su/rmda/upkrpromo-HD-x264.mp4
4K : https://emulate.su/rmda/upkrpromo-4K-x264.mp4
8K : https://emulate.su/rmda/upkrpromo-8K-x265.mp4

Online copy of this release:
https://emulate.su/rmda/upkrpromo.zip

Screenshoot available inside of ZIP
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