Taken from private repo

Author: Veltas

.gitignore

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+s/*
+*.bin
+*.lst
+*.tap
+*.wav
+*.swp
+*.core

COPYING

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+Creative Commons Legal Code
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Makefile

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+.PHONY: all
+all: zapp.bin zapp.tap zapp.wav
+
+zapp.wav: zapp.tap
+	tape2wav zapp.tap $@
+
+zapp.tap: zapp.bin
+	bin2tap -b -o $@ zapp.bin
+
+zapp.bin zapp.lst: *.asm *.c
+	zasm -I sdcc/include -L sdcc/lib -y objlayout.asm -l zapp.lst -o zapp.bin
+
+.PHONY: listing
+listing: zapp.lst
+	less zapp.lst
+
+.PHONY: clean
+clean:
+	rm -rf *.bin *.lst *.tap *.wav s/

README.md

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+Environment for ZX Spectrum
+===========================
+
+Building
+--------
+
+Prerequisites:
+
+* zasm Z80 assembler  
+  https://k1.spdns.de/Develop/Projects/zasm/Distributions/
+* SDCC (tested with 3.5.0)  
+  http://sdcc.sourceforge.net/
+* Make implementation  
+  e.g. GNU Make, BSD pmake, Microsoft NMAKE
+* zx-spectrum-utils  
+  https://sourceforge.net/projects/zxspectrumutils/
+* fuse-emulator-utils (only needed to generate audio file)  
+  https://sourceforge.net/p/fuse-emulator/code/HEAD/tree/trunk/fuse-utils/
+
+The tools and utilities used to build this project have only been tested on
+GNU/Linux and FreeBSD.
+
+SDCC has generated incorrect assembly code on later versions than 3.5.0.
+
+The default make target will build the project, and produce `.tap` and `.wav`
+files to run it in an emulator or on the real hardware.
+
+    $ cd zapp-extract-location/
+    $ make
+
+
+Running in an emulator
+----------------------
+
+Prerequisites:
+
+* A ZX Spectrum emulator
+
+For UNIX/X11 systems Fuse (the Free Unix Spectrum Emulator) is recommended.  
+http://fuse-emulator.sourceforge.net/
+
+The instructions in the 'Building' section produce a `.tap` file, and can
+produce a `.wav` file as well. All ZX Spectrum emulators will support the
+`.wav`, some will support the `.tap` (and will load the program faster if so).
+
+If loading from the `.wav` you may need to initiate the loading routine
+manually:
+
+1. Enter `LOAD ""` (`j`, `sym. shift + p`, `sym. shift + p`) -- `sym. shift`
+   key is usally bound to the Alt key in most emulators.
+2. Play the audio file.
+
+
+Running on the ZX Spectrum
+--------------------------
+
+Prerequisites:
+
+* Sinclair ZX Spectrum 48K (or better)
+* Male-male 3.5mm audio jack / phone connector
+* Audio player
+
+Your audio player will need to play the `.wav` file produced in the section
+'Building'. This could be e.g. an MP3 player, phone, laptop, or even a cassette
+tape, but ultimately will need to plug into the ZX Spectrum's MIC port while
+playing the audio.
+
+1. Turn on the ZX Spectrum and connect it to your TV/monitor.
+2. Connect the audio player's headphone or line out port to the Spectrum's MIC
+   port (ensure the audio player is set to full volume).
+3. Enter the Sinclair BASIC command `LOAD ""`.
+4. Play the audio file.
+
+* * *
+
+Copyright for files not in `sdcc` directory waived by CC0, see `COPYING` and the
+below copyright notice.
+
+### ZX Spectrum Environment
+
+Written in 2017 by Christopher J. Leonard <[email protected]>.
+
+**To the extent possible under law, the author(s) have dedicated all copyright
+and related and neighboring rights to this software to the public domain
+worldwide. This software is distributed without any warranty.**
+
+You should have received a copy of the CC0 Public Domain Dedication along with
+this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.