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So Lee gave you only 900 bytes, but then had room for a speech sample scratches head. Well done though, mate

Oh yeah! This one goes deep.

Sigh... I'm still pissed about the whole story.

I remember these ports making rounds a couple of years ago, though I can't remember either who did them. The problem is that none of these work on actual hardware, at least not without modifications to the board (including my 1k2b). An actual unmodded ZX81 will produce a loud static noise which drowns out any music played by the machine.

A dedicated noise channel might also be interesting (with fake volume control through the duty cycle approach, otherwise it will overpower the sample channels), because noise is expensive when PWM sampled.

I'm thinking dedicated tone channels might not even be necessary since they can be "emulated" with PWM samples. Even simple chords should not be too expensive in terms of memory usage. Maybe 3 sample channels can be done instead? Don't know how feasible that would be in terms of overloading. The same applies to additional tone channels, of course. For example, I tried using some longer breakbeat samples in Squat. That almost completely drowned out the tone channels.

Cheers guys! Great compo, lovely tracks from y'all. Hearing good old LSengine put a smile on my face.

I'm a bit surprised that Horseman scored comparatively low. I thought it was a very strong entry.

Regarding the samples, what surprised me is that those acid chirps worked so well, as in, they interfere much less with the tone channels than I was expecting. They took surprisingly little memory as well. This gave me an idea for a new engine, actually. How about just two channels of pitchable PWM samples or'ed together? With a bit of extra magic from the PWM encoder it should be quite flexible. As in - make 0 a special value instead of just an end marker - if followed by another 0, loop to the sample start (to enable tones), if followed by 1, stop sample playback, any other value = extend current half-cycle by n-2 samples. The converter should also invert the data if the total number "on" samples is greater than the total number of "off" samples.

Yay, got one in as well. Alright, let's have a blast!

A little reminder about the approaching deadline of the beeper compo at Multimatograf. Let's show all the lAYmers who's the boss

Great find, as always. I recall reading about this shutdown event before, but didn't know a recording existed in the wild.

I think the best option is to just wire the PC Speaker socket to a line out, and connect that to your hi-fi. Alternatively, most older sound cards have a socket for routing the PC Speaker through it (labelled SPKIN, usually), so you just need to connect that to the PC Speaker socket with a jumper cable.

Even though I'm originally from Germany, I've never heard of that console before, let alone seen one in the wild.
Since it's supported in MAME it could, in theory, be support it in Bintracker.

upd7810 seems very funky. Not sure what they were thinking when they designed that. Could be fun to program it, though.