diff --git a/doc/geos.sgml b/doc/geos.sgml
index 31ede5f8a..019e3533a 100644
--- a/doc/geos.sgml
+++ b/doc/geos.sgml
@@ -6,7 +6,7 @@
 
 <title>GEOSLib docs
 <author>Maciej Witkowiak, <htmlurl url="mailto:ytm@elysium.pl" name="ytm@elysium.pl">
-<date>v1.2, 26.12.1999, 16.03.2000, 19-22.03.2000, 11,29.07.2000, 3-4.07.2001
+<date>v1.2, 26.12.1999, 16.03.2000, 19-22.03.2000, 11,29.07.2000, 3-4,15.07.2001
 <abstract>
 This is the documentation of cc65's GEOSLib, but information contained here may be also
 useful for writting GEOS applications in general.
@@ -27,10 +27,16 @@ is easy to use and program.
 Coding GEOS in C? That's something new. It is possible now - with Ulrich von Bassewitz's cc65
 package and my GEOSLib you are able to create GEOS applications in no-time.
 <p>
-GEOSLib supports a subset of standard cc65 libraries. Memory and string functions are included
-but you should consider using native versions of these (e.g. <tt/FillRam/ instead of </ttmemset/)
-at least in this version. <tt/dio/ - direct disk access is available, but you might have
-problems with devices other than 1541, 1571 or 1581. RAM drives emulating these should work.
+GEOSLib supports a subset of standard cc65 libraries. Whenever possible native Kernal functions
+are used (e.g. <tt/memset/ is an alias for <tt/FillRam/), however not all are supported. E.g.
+string functions like <tt/strcmp/, <tt/strcpy/ are doubled with native <tt/CmpString/,
+<tt/CopyString/ because the latter can handle only 256 byte strings. Keep this in mind when
+you will write your program. If you don't need long strings simply use functions from Kernal,
+resulting code will be smaller.
+<p>
+<tt/dio/ - direct disk access is available, but you might have problems with devices other
+than 1541, 1571 or 1581. RAM drives emulating these should work.
+<p>
 It is safe to use these includes: <tt/dio.h, errno.h, geos.h, joystick.h, mouse.h, stdlib.h,
 string.h/
 <p>
@@ -992,8 +998,8 @@ Functions covered in this section are common for whole C world - copying memory
 strings is one of the main computer tasks. GEOS also has interface to do this. These functions
 are replacement for those like <tt/memset, memcpy, strcpy/ etc. from standard libraries.
 
-However they have slighty different calling convention (order of arguments to be specific), so
-please check their syntax here before direct replacing.
+However some of them have slighty different calling convention (order of arguments to be specific),
+so please check their syntax here before direct replacing.
 
 Please note that the memory described as <em/strings/ are up to 255 characters (without
 counting the terminating <tt/NULL/), and <em/regions/ cover whole 64K of memory.
@@ -1031,21 +1037,21 @@ compatible with standard CRC routines.
 
 <sect2>FillRam and ClearRam
 <p>
-<tt/void FillRam (char value, char *dest, int length)/
+<tt/void FillRam (char *dest, char value, int length)/
 <p>
 <tt/void ClearRam (char *dest, int length)/
 <p>
 Both functions are filling given memory range. <tt/ClearRam/ fills with <tt/NULLs/, while
 <tt/FillRam/ uses given <tt/value/. Be warned that these functions destroy <tt/r0, r1 and
-r2L/ registers.
+r2L/ registers. <tt/FillRam/ is an alias for <tt/memset/.
 
 <sect2>MoveData
 <p>
-<tt/void MoveData (char *src, char *dest, int length)/
+<tt/void MoveData (char *dest, char *src, int length)/
 <p>
 This functions copies one memory region to another. There are checks for overlap and the
 non-destructive method is chosen. Be warned that this function destroys contents of
-<tt/r0, r1 and r2/ registers.
+<tt/r0, r1 and r2/ registers. This is also alias for <tt/memcpy/
 
 <sect2>InitRam
 <p>
@@ -1066,6 +1072,7 @@ This is done with <tt/table/ where everything is defined. See structures chapter
 <tt/ char VerifyRAM (char bank, int length, char *reuAddress, char *cpuAddress)/
 <p>
 These functions are interface to REU - Ram Expansion Unit. I think that they are self-explanatory.
+You can check for REU presence by taking value of <tt/ramExpSize/.
 
 <sect1>Processes and Multitasking
 <p>
diff --git a/include/geos/gdisk.h b/include/geos/gdisk.h
index 9fac4640a..68eea97e6 100644
--- a/include/geos/gdisk.h
+++ b/include/geos/gdisk.h
@@ -53,6 +53,7 @@ char __fastcall__ ChangeDiskDevice(char newdev);
 #define	OFF_GS_ID	173
 /* disk errors */
 #define	ANY_FAULT	0xf0
+#define G_EOF		0
 #define	NO_BLOCKS	1
 #define	INV_TRACK	2
 #define	INSUFF_SPACE	3
diff --git a/include/geos/ggraph.h b/include/geos/ggraph.h
index 51caad7ba..d59947157 100644
--- a/include/geos/ggraph.h
+++ b/include/geos/ggraph.h
@@ -83,7 +83,6 @@ void __fastcall__ GraphicsString(char *myGfxString);
 #define	SCREENBYTEWIDTH		80
 #define	SCREENPIXELWIDTH	640
 /* control characters for use as numbers, not chars */
-#define	EOF		0
 #define	BACKSPACE	8
 #define	FORWARDSPACE	9
 #define	TAB		9
diff --git a/include/geos/gmemory.h b/include/geos/gmemory.h
index 805728864..e9398d5ca 100644
--- a/include/geos/gmemory.h
+++ b/include/geos/gmemory.h
@@ -19,9 +19,9 @@ char __fastcall__ CmpFString(char len, char *dest, char *source);
 
 int __fastcall__ CRC(char *buffer, int len);
 void __fastcall__ ClearRam(char *dest, int len);
-void __fastcall__ FillRam(char what, char *dest, int len);
+void __fastcall__ FillRam(char *dest, char what, int len);
 
-void __fastcall__ MoveData(char *source, char *dest, int len);
+void __fastcall__ MoveData(char *dest, char *source, int len);
 
 void __fastcall__ InitRam(char *myInitTab);
 
diff --git a/libsrc/geos/Makefile b/libsrc/geos/Makefile
index 178c3d4f3..c38db30e4 100644
--- a/libsrc/geos/Makefile
+++ b/libsrc/geos/Makefile
@@ -4,7 +4,7 @@
 #
 # Maciej 'YTM/Elysium' Witkowiak
 
-OBJ_DIRS=devel disk dlgbox file graph menuicon memory mousesprite process system
+OBJ_DIRS=common devel disk dlgbox file graph menuicon memory mousesprite process system
 
 all:
 	@for i in $(OBJ_DIRS); do $(MAKE) -C $$i; done
diff --git a/libsrc/geos/common/Makefile b/libsrc/geos/common/Makefile
new file mode 100644
index 000000000..8bea80e58
--- /dev/null
+++ b/libsrc/geos/common/Makefile
@@ -0,0 +1,21 @@
+#
+# Makefile for GEOS lib
+# for cc65
+#
+
+%.o:   	%.c
+	@$(CC) $(CFLAGS) $<
+	@$(AS) -g -o $@ $(AFLAGS) $(*).s
+
+%.o:	%.s
+	@$(AS) -o $@ $(AFLAGS) $<
+
+C_OBJS	= abort.o perror.o
+S_OBJS	= copydata.o memcpy.o memset.o rand.o
+
+all: $(C_OBJS) $(S_OBJS)
+
+clean:
+	@rm -f *.~ $(S_OBJS) core
+	@rm -f $(C_OBJS:.o=.s)
+	@rm -f $(C_OBJS)
diff --git a/libsrc/geos/common/abort.c b/libsrc/geos/common/abort.c
new file mode 100644
index 000000000..fb52f88e1
--- /dev/null
+++ b/libsrc/geos/common/abort.c
@@ -0,0 +1,16 @@
+/*
+ * abort.c
+ *
+ * Maciej 'YTM/Elysium' Witkowiak 15.7.2001
+ */
+
+
+
+#include <stdlib.h>
+#include <geos.h>
+
+void abort (void)
+{
+    DlgBoxOk(CBOLDON "ABNORMAL PROGRAM", "TERMINATION." CPLAINTEXT);
+    exit(3);
+}
diff --git a/libsrc/geos/common/copydata.s b/libsrc/geos/common/copydata.s
new file mode 100644
index 000000000..2efd7c352
--- /dev/null
+++ b/libsrc/geos/common/copydata.s
@@ -0,0 +1,27 @@
+;
+; Maciej 'YTM/Elysium' Witkowiak 15.07.2001
+;
+; Copy the data segment from the LOAD to the RUN location
+;
+
+	.export		copydata
+	.import		__DATA_LOAD__, __DATA_RUN__, __DATA_SIZE__
+	.include	"../inc/geossym.inc"
+	.include 	"../inc/jumptab.inc"
+
+copydata:
+	lda #<__DATA_SIZE__	; no need to check if it is == 0
+	ldx #>__DATA_SIZE__
+	sta r2L
+	stx r2H
+
+	lda #<__DATA_RUN__
+	ldx #>__DATA_RUN__
+	sta r1L
+	stx r1H
+
+	lda #<__DATA_LOAD__
+	ldx #>__DATA_LOAD__
+	sta r0L
+	stx r0H
+	jmp MoveData
diff --git a/libsrc/geos/common/memcpy.s b/libsrc/geos/common/memcpy.s
new file mode 100644
index 000000000..442837d7e
--- /dev/null
+++ b/libsrc/geos/common/memcpy.s
@@ -0,0 +1,12 @@
+;
+; void* memcpy (void* dest, const void* src, size_t n);
+; void* memmove (void* dest, const void* src, size_t n);
+;
+; Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
+;
+
+  	.export		_memcpy, _memmove
+	.import		_MoveData
+
+_memcpy	= _MoveData
+_memmove = _MoveData
diff --git a/libsrc/geos/common/memset.s b/libsrc/geos/common/memset.s
new file mode 100644
index 000000000..d4169c2b3
--- /dev/null
+++ b/libsrc/geos/common/memset.s
@@ -0,0 +1,10 @@
+;
+; void* memset (void* ptr, int c, size_t n);
+;
+; Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
+;
+
+ 	.export		_memset
+	.import		_FillRam
+
+_memset = _FillRam
diff --git a/libsrc/geos/common/perror.c b/libsrc/geos/common/perror.c
new file mode 100644
index 000000000..6d64b25a2
--- /dev/null
+++ b/libsrc/geos/common/perror.c
@@ -0,0 +1,17 @@
+/*
+ * perror.c
+ *
+ * Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <geos.h>
+
+void perror(const char* msg)
+{
+
+    DlgBoxOk((char*)msg,strerror(errno));
+
+}
diff --git a/libsrc/geos/common/rand.s b/libsrc/geos/common/rand.s
new file mode 100644
index 000000000..ad2db1823
--- /dev/null
+++ b/libsrc/geos/common/rand.s
@@ -0,0 +1,20 @@
+;
+; Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
+;
+;
+; int rand (void);
+; void srand (unsigned seed);
+;
+      	.export		_rand, _srand
+	.include	"../inc/jumptab.inc"
+
+.code
+
+_rand:
+	jsr GetRandom
+	pha
+	jsr GetRandom
+	tax
+	pla
+_srand:
+	rts
diff --git a/libsrc/geos/memory/fillram.s b/libsrc/geos/memory/fillram.s
index c08b05e5c..72301c7fd 100644
--- a/libsrc/geos/memory/fillram.s
+++ b/libsrc/geos/memory/fillram.s
@@ -1,19 +1,23 @@
 
 ;
-; Maciej 'YTM/Alliance' Witkowiak
+; Maciej 'YTM/Elysium' Witkowiak
 ;
-; 30.10.99
+; 30.10.99, 15.07.2001
 
-; void FillRam         (char what, char *dest, int length);
+; void FillRam         (char *dest, char what, int length);
 
-	    .import DoublePop, popa
+	    .import popa, popax
 	    .export _FillRam
 
 	    .include "../inc/jumptab.inc"
 	    .include "../inc/geossym.inc"
 
 _FillRam:
-	    jsr DoublePop
+	    sta r0L
+	    stx r0H
 	    jsr popa
 	    sta r2L
+	    jsr popax
+	    sta r1L
+	    stx r1H
 	    jmp FillRam
diff --git a/libsrc/geos/memory/movedata.s b/libsrc/geos/memory/movedata.s
index 79022593a..b16ef2392 100644
--- a/libsrc/geos/memory/movedata.s
+++ b/libsrc/geos/memory/movedata.s
@@ -1,10 +1,10 @@
 
 ;
-; Maciej 'YTM/Alliance' Witkowiak
+; Maciej 'YTM/Elysium' Witkowiak
 ;
-; 30.10.99
+; 30.10.99, 15.07.2001
 
-; void MoveData         (char* source, char *dest, int length);
+; void MoveData         (char* dest, char *source, int length);
 
 	    .import popax
 	    .export _MoveData
@@ -16,9 +16,9 @@ _MoveData:
 	    sta r2L
 	    stx r2H
 	    jsr popax
-	    sta r1L
-	    stx r1H
-	    jsr popax
 	    sta r0L
 	    stx r0H
+	    jsr popax
+	    sta r1L
+	    stx r1H
 	    jmp MoveData