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 # Stream-PDM
-Stream Pulse-Density-Modulation Sound on the Apple II
+Stream-PDM simultaneously receives Pulse-Density-Modulation Sound from any HTTP server and plays it through the stock Apple II speaker in a consistent 13 cycle loop resulting in a stable 78671.3Hz pulse frequency. Those 13 cycles are feasible through aggressive loop unrolling resulting in 32kB of code. Those 32kB aren't loaded from disk but are generated on the fly.
+
+Hardware requirements:
+* Enhanced //e or IIgs
+* [Uthernet II](http://a2retrosystems.com/products.htm) in any slot
 
 To built Stream-PDM:
 * Get [cc65](https://cc65.github.io/)
 * Get [IP65](https://github.com/cc65/ip65/wiki) and place it in a subdirectory `ip65`
 * Enter `cl65 -t apple2enh -Or -I ip65 -D SINGLE_SOCKET stream-pdm.c stream.s w5100_http.c w5100.c linenoise.c ip65/ip65.lib ip65/ip65_apple2.lib`
 
+To create a PDM file:
+* Create a headerless ***.raw** file with 78670Hz mono 32-bit-float PCM data (e.g. with [Audacity](https://www.audacityteam.org/))
+* Convert the ***.raw** file into an ***.a2stream** file with converter.exe
+
+To stream a PDM file:
+* Put the ***.a2stream** file onto any HTTP server
+* Run Stream-PDM and point it to the URL of the ***.a2stream** file
+
+To config Stream-PDM:
+* Put the Uthernet II in slot 3 <ins>or</ins>
+* Create a file named **ETHERNET.SLOT**. Only the first byte of that file is relevant. This byte can either represent your Uthernet II slot as binary value (e.g. $04 for slot 4), as ASCII digit (e.g. $34 for slot 4) or as Apple TEXT digit (e.g. $B4 for slot 4).