diff --git a/apps/zasm/directive.asm b/apps/zasm/directive.asm
index e4b65ba..9c42901 100644
--- a/apps/zasm/directive.asm
+++ b/apps/zasm/directive.asm
@@ -4,7 +4,8 @@
 .equ	D_DW	0x01
 .equ	D_EQU	0x02
 .equ	D_ORG	0x03
-.equ	D_INC	0x04
+.equ	D_FIL	0x04
+.equ	D_INC	0x05
 .equ	D_BAD	0xff
 
 ; *** Variables ***
@@ -18,6 +19,7 @@ directiveNames:
 	.db	".DW", 0
 	.db	".EQU"
 	.db	".ORG"
+	.db	".FIL"
 	.db	"#inc"
 
 ; This is a list of handlers corresponding to indexes in directiveNames
@@ -26,6 +28,7 @@ directiveHandlers:
 	.dw	handleDW
 	.dw	handleEQU
 	.dw	handleORG
+	.dw	handleFIL
 	.dw	handleINC
 
 handleDB:
@@ -103,6 +106,19 @@ handleORG:
 	push	ix \ pop hl
 	jp	zasmSetOrg
 
+handleFIL:
+	call	readWord
+	call	parseExpr
+	ret	nz
+	push	bc
+	push	ix \ pop bc
+	xor	a
+	ld	b, c
+.loop:
+	call	ioPutC
+	djnz	.loop
+	pop	bc
+
 handleINC:
 	call	readWord
 	jr	nz, .end
diff --git a/tools/emul/Makefile b/tools/emul/Makefile
index 9ba7e2c..0cfcf8a 100644
--- a/tools/emul/Makefile
+++ b/tools/emul/Makefile
@@ -33,11 +33,11 @@ shell/shell: shell/shell.c libz80/libz80.o shell/kernel.h $(CFSPACK)
 $(ZASMBIN): zasm/zasm.c libz80/libz80.o zasm/kernel.h zasm/user.h zasm/includes.h
 runbin/runbin: runbin/runbin.c libz80/libz80.o
 $(TARGETS):
-	cc $< libz80/libz80.o -o $@
+	$(CC) $< libz80/libz80.o -o $@
 
 libz80/libz80.o: libz80/z80.c
 	make -C libz80/codegen opcodes
-	gcc -Wall -ansi -g -c -o libz80/libz80.o libz80/z80.c
+	$(CC) -Wall -ansi -g -c -o libz80/libz80.o libz80/z80.c
 
 $(CFSPACK):
 	make -C ../cfspack
diff --git a/tools/emul/zasm/zasm.bin b/tools/emul/zasm/zasm.bin
index 2ed59ed..f6c9b9a 100644
Binary files a/tools/emul/zasm/zasm.bin and b/tools/emul/zasm/zasm.bin differ
diff --git a/tools/tests/zasm/test1.asm b/tools/tests/zasm/test1.asm
index 25b905c..da2fcb9 100644
--- a/tools/tests/zasm/test1.asm
+++ b/tools/tests/zasm/test1.asm
@@ -27,3 +27,4 @@ label2: .dw	0x42
 	rlc	c
 	cp	'-'
 	sbc	hl, de
+.fill	0x10