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+---js
+const title = "Aerations - Hacking Furnace to do stuff";
+const description = "Some ramblings about timers";
+const date = "2025-09-17";
+const tags = ["atari st", "timer fx", "timers", "demoscene"];
+const draft = true;
+---
+
+[comment]: # (god the depresso is getting to me i'm going to write something to soothe the nerves, but well this is a hidden comment you're not supposed to see this in the final post - 09/17/2025 @ 8:57 pm)
+
+back in July this year, we released "Aerations" at the Sommarhack 2025 demoparty. with it, we
+demonstrated the ability to compose Atari ST music, with classic timer effects like PWM and
+SyncBuzzer, and the ability to export it under a format usable on real hardware (thanks Natt!)
+
+developing the tech required for it was a real pain in the arse... it turns out that the ST is
+janky, and therefore also has janky audio, and we needed to emulate this jankness in the tracker
+
+# timer effects: what?
+generally speaking, a timer is a mechanism that lets an action be done at a preset time. on
+computers, it lets the CPU do things periodically, and if it is able to interrupt the CPU, allows
+actions to be executed automatically at regular, periodic intervals.
+
+on every Atari ST ever made is a chip called the *MC68901: Multi-Function Peripheral (MFP)*,
+and this chip provides an USART, an interrupt controller, and most notably, 4 timers. these
+timers are at the heart of *timer effects* (hereby called *timer FX*).
+
+what is *timer FX*? on the Atari ST, it means any effect that messes with the YM2149 sound registers.
+this means it can be used to write to a register at regular intervals, producing
+audible effects (like frequency modulation, amplitude modulation, etc...). although there are a
+variety of effects that can be done with this, for Aerations in particular, we only used 2:
+- PWM (Pulse Width Modulation)
+- SyncBuzzer