A ZX Spectrum program on a Serbian vinyl record from the 1980s

Another ZX Spectrum program hidden in a record? Again. This time, it’s on a single by the Serbian group Bajaga I Instruktori. It’s not really hidden, though: it’s indicated on the record.

Instead of repeating all the previous articles each time, I’ll refer you to the dedicated page, which explains what I do with vinyl records and lists all the pages containing programs, explanations, etc.


I’m not sure if there’s a cover, as the single is just a promotional record for an album. I’m not the first one to decode it; someone did it in 2020 (and apparently had more trouble than me) and got a quite comprehensive article (in Bosnian, but the Google translation seems fairly clean).

The record

His version of the TZX file (basically, a ZX Spectrum ROM, available on YouTube) doesn’t have the same MD5 as mine, but he indicates that he had to reconstruct the file from several recordings. In my case, I got a valid result (without CRC errors) after a few tries, recording via the mic input of my sound card and filtering out high frequencies. The program itself isn’t really anything special: it’s essentially a text-based animation that lasts almost 12 minutes (with a lot of beeps). The program loops, in fact, there’s no real end.

The opening