11 lines
558 B
Markdown
11 lines
558 B
Markdown
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# ZX Spectrum Speaker
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Rather than having a dedicated sound synthesizer, early ZX Spectrum models had one piezo beeper, controlled by Z80 CPU and ULA chip. It's capabilities should be on par with an IBM PC speaker... right?
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Not really - very soon talented programmers found out ways to output much more than one square wave channel. A lot of ZX beeper routines do exist, as of 0.6pre1 Furnace supports only one - Follin-like engine with 6 channels of narrow pulse wave and click drums.
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# effects
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- `12xx`: set pulse width
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- `17xx`: trigger overlay drums.
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