diff --git a/pkgs/development/compilers/atasm/0000-file-not-found.diff b/pkgs/development/compilers/atasm/0000-file-not-found.diff
new file mode 100644
index 000000000000..39caaf304174
--- /dev/null
+++ b/pkgs/development/compilers/atasm/0000-file-not-found.diff
@@ -0,0 +1,16 @@
+diff -Naur atasm109-old/src/Makefile atasm109-new/src/Makefile
+--- atasm109-old/src/Makefile	2021-09-08 09:53:25.581598063 -0300
++++ atasm109-new/src/Makefile	2021-09-08 09:55:20.366131338 -0300
+@@ -55,9 +55,9 @@
+ 	chown root.root $(DESTDIR)/atasm || true
+ 	chmod 711 $(DESTDIR)/atasm
+ 	mkdir $(DOCDIR) >/dev/null 2>&1 || echo $(DOCDIR) already exists
+-	cp ../atasm.txt $(DOCDIR)
+-	chown root.root $(DOCDIR)/atasm.txt || true
+-	chmod 644 $(DOCDIR)/atasm.txt
++	# cp ../atasm.txt $(DOCDIR)
++	# chown root.root $(DOCDIR)/atasm.txt || true
++	# chmod 644 $(DOCDIR)/atasm.txt
+ 	sed -e 's,%%DOCDIR%%,$(DOCDIR),g' < atasm.1.in > atasm.1
+ 	cp atasm.1 $(MANDIR)
+ 	chown root.root $(MANDIR)/atasm.1 || true
diff --git a/pkgs/development/compilers/atasm/0001-select-flags.diff b/pkgs/development/compilers/atasm/0001-select-flags.diff
new file mode 100644
index 000000000000..b8fce38fcf28
--- /dev/null
+++ b/pkgs/development/compilers/atasm/0001-select-flags.diff
@@ -0,0 +1,14 @@
+diff -Naur atasm109-old/src/Makefile atasm109-new/src/Makefile
+--- atasm109-old/src/Makefile	2021-09-08 09:53:25.581598063 -0300
++++ atasm109-new/src/Makefile	2021-09-08 09:55:20.366131338 -0300
+@@ -16,8 +16,8 @@
+ UNIX    = -DUNIX
+ 
+ # Compiler flags, if you are using egcs, pgcs, or gcc >2.8.1 use:
+-#CFLAGS  = -g -Wall $(USEZ) $(DOS) $(UNIX) $(ARCH)
+-CFLAGS  = -Wall $(USEZ) $(DOS) $(UNIX) -O3 -fomit-frame-pointer $(ARCH)
++CFLAGS  = -g -Wall $(USEZ) $(DOS) $(UNIX) $(ARCH)
++#CFLAGS  = -Wall $(USEZ) $(DOS) $(UNIX) -O3 -fomit-frame-pointer $(ARCH)
+ 
+ L       =  $(ZLIB)
+ CC      = gcc
diff --git a/pkgs/development/compilers/atasm/default.nix b/pkgs/development/compilers/atasm/default.nix
new file mode 100644
index 000000000000..74f54d8d03cf
--- /dev/null
+++ b/pkgs/development/compilers/atasm/default.nix
@@ -0,0 +1,64 @@
+{ lib
+, stdenv
+, fetchurl
+, unzip
+, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "atasm";
+  version = "1.09";
+
+  src = fetchurl {
+    url = "https://atari.miribilist.com/${pname}/${pname}${builtins.replaceStrings ["."] [""] version}.zip";
+    hash = "sha256-26shhw2r30GZIPz6S1rf6dOLKRpgpLwrqCRZX3+8PvA=";
+  };
+
+  patches = [
+    # make install fails because atasm.txt was moved; report to upstream
+    ./0000-file-not-found.diff
+    # select flags for compilation
+    ./0001-select-flags.diff
+  ];
+
+  dontConfigure = true;
+
+  nativeBuildInputs = [
+    unzip
+  ];
+
+  buildInputs = [
+    zlib
+  ];
+
+  preBuild = ''
+    makeFlagsArray+=(
+      -C ./src
+      CC=cc
+      USEZ="-DZLIB_CAPABLE -I${zlib}/include"
+      ZLIB="-L${zlib}/lib -lz"
+      UNIX="-DUNIX"
+    )
+  '';
+
+  preInstall = ''
+    install -d $out/share/doc/${pname} $out/man/man1
+    installFlagsArray+=(
+      DESTDIR=$out
+      DOCDIR=$out/share/doc/${pname}
+      MANDIR=$out/man/man1
+    )
+  '';
+
+  postInstall = ''
+    mv docs/* $out/share/doc/${pname}
+  '';
+
+  meta = with lib; {
+    homepage = "https://atari.miribilist.com/atasm/";
+    description = "A commandline 6502 assembler compatible with Mac/65";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ AndersonTorres ];
+    platforms = with platforms; unix;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a9321c3b51be..04cc67704e45 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -10828,6 +10828,8 @@ with pkgs;
 
   aspectj = callPackage ../development/compilers/aspectj { };
 
+  atasm = callPackage ../development/compilers/atasm { };
+
   ats = callPackage ../development/compilers/ats { };
   ats2 = callPackage ../development/compilers/ats2 { };