diff --git a/GWBASIC.LNK b/GWBASIC.LNK
index b5039d8..40632ee 100644
--- a/GWBASIC.LNK
+++ b/GWBASIC.LNK
@@ -1,3 +1,4 @@
+GWDATA.OBJ+
 ADVGRP.OBJ+
 BIBOOT.OBJ+
 BIMISC.OBJ+
@@ -17,7 +18,6 @@ GIOKYB.OBJ+
 GIOLPT.OBJ+
 GIOSCN.OBJ+
 GIOTBL.OBJ+
-GWDATA.OBJ+
 GWEVAL.OBJ+
 GWINIT.OBJ+
 GWLIST.OBJ+
@@ -33,4 +33,5 @@ NEXT86.OBJ+
 SCNDRV.OBJ+
 SCNEDT.OBJ+
 OEM.OBJ
-gwbasic;
+gwbasic /STACK:8192
+gwbasic.map;
diff --git a/GWDATA.ASM b/GWDATA.ASM
index 0d2b15c..06e4d54 100644
--- a/GWDATA.ASM
+++ b/GWDATA.ASM
@@ -623,6 +623,9 @@ BEGDSG	LABEL WORD
 PUBLIC	CPMMEM
 CPMMEM	LABEL WORD
 DSEG	ENDS
+SSEG	SEGMENT STACK 'STACKSG'		
+	ASSUME SS:SSEG
+SSEG	ENDS
 ; ======== Code Phase ========
 	RAMLOW=$		;WHERE CONSTANTS GET DEPOSITED
 	INS86	352		;INTER-SEGMENT DIRECT JUMP
diff --git a/MATH1.ASM b/MATH1.ASM
index d0f4df6..b876b50 100644
--- a/MATH1.ASM
+++ b/MATH1.ASM
@@ -979,7 +979,7 @@ SIN20:
 ; At this point the FAC has the remainder of the angle / 2*PI
 ;
 SIN30:
-	MOV	AL,LOW OFFSET $FAC
+	MOV	AL,BYTE PTR $FAC
 	OR	AL,AL
 	JZ	SIN31
 	ADD	BYTE PTR $FAC,LOW 2	; FAC = FAC*4 = Reduce angle / PI/2
diff --git a/OEM.ASM b/OEM.ASM
index d08ff87..7cedfcf 100644
--- a/OEM.ASM
+++ b/OEM.ASM
@@ -65,9 +65,26 @@ SCRINP:			;Dummy function
 ;
 PUBLIC	SCROUT
 SCROUT:
-        POP     BX
+		push	ax
+		push	bx
+		push	cx
+		xor	bx,bx
+		mov	ah,2
+		push	ax
+		int	20	; 0x10
+		pop	ax
+		mov	cx,1
+		mov	bx,7
+		mov	ah,12	; 0xa
+		int	20	; 0x10
+		pop	cx
+		pop	bx
+		pop	ax
         RET
 
+; MSX:  Record current cursor addresses mask pattern
+; Input    : BX - Cursor address
+;            AL - Mask pattern
 PUBLIC	STOREC
 STOREC:			;Dummy function
 	RET
@@ -88,6 +105,7 @@ PUBLIC	RDTRIG
 RDTRIG:			;Dummy function
 	RET
 
+; MSX:  Set horizontal screen pixels
 PUBLIC	NSETCX
 NSETCX:			;Dummy function
 	RET
@@ -112,6 +130,7 @@ PUBLIC	SETCBF
 SETCBF:			;Dummy function
 	RET
 
+; MSX:  Shifts screen pixel to the left
 PUBLIC	LEFTC
 LEFTC:			;Dummy function
 	RET
@@ -132,10 +151,13 @@ PUBLIC	SETFBC
 SETFBC:			;Dummy function
 	RET
 
+; MSX:  Tests whether DOWNC is possible, if possible, execute DOWNC
+; Set carry flag set if operation would end outside the screen
 PUBLIC	TDOWNC
 TDOWNC:			;Dummy function
 	RET
 
+; MSX:  Scans screen pixels to the right
 PUBLIC	SCANR
 SCANR:			;Dummy function
 	RET
@@ -148,18 +170,24 @@ PUBLIC	GETHED
 GETHED:			;Dummy function
 	RET
 
+; MSX:  Shifts screen pixel up
 PUBLIC	UPC
 UPC:			;Dummy function
 	RET
 
+; MSX:  Scans screen pixels to the left
 PUBLIC	SCANL
 SCANL:			;Dummy function
 	RET
 
+; MSX:  Gets current cursor addresses mask pattern
+; Output   : BX - Cursor address
+;            AL - Mask pattern
 PUBLIC	FETCHC
 FETCHC:			;Dummy function
 	RET
 
+; MSX:  Scales X and Y coordinates
 PUBLIC	SCALXY
 SCALXY:			;Dummy function
 	RET
@@ -176,6 +204,7 @@ PUBLIC	STACOM
 STACOM:			;Dummy function
 	RET
 
+; MSX:  Reads attribute byte of current screen pixel
 PUBLIC	READC
 READC:			;Dummy function
 	RET
@@ -184,10 +213,13 @@ PUBLIC	INFMAP
 INFMAP:			;Dummy function
 	RET
 
+; MSX:  Tests whether UPC is possible, if possible, execute UPC
+; Set carry flag set if operation would end outside the screen
 PUBLIC	TUPC
 TUPC:			;Dummy function
 	RET
 
+; MSX:  Shifts screen pixel to the right
 PUBLIC	RIGHTC
 RIGHTC:			;Dummy function
 	RET
@@ -196,6 +228,8 @@ PUBLIC	SEGINI
 SEGINI:			;Dummy function
 	RET
 
+; MSX:  Gets screen relations
+; Output   : DX, BX
 PUBLIC	GTASPC
 GTASPC:			;Dummy function
 	RET
@@ -204,6 +238,7 @@ PUBLIC	RECCOM
 RECCOM:			;Dummy function
 	RET
 
+; MSX:  Returns current screen pixel of specified attribute byte
 PUBLIC	SETC
 SETC:			;Dummy function
 	RET
@@ -212,6 +247,7 @@ PUBLIC	PIXSIZ
 PIXSIZ:			;Dummy function
 	RET
 
+; MSX:  Shifts screen pixel down
 PUBLIC	DOWNC
 DOWNC:			;Dummy function
 	RET
@@ -273,10 +309,12 @@ PUBLIC	CSRDSP
 CSRDSP:
 	RET
 
+; MSX:  Set attribute byte
 PUBLIC	SETATR
 SETATR:			;Dummy function
 	RET
 
+; MSX:  Initalises the PAINT instruction
 PUBLIC	PNTINI
 PNTINI:			;Dummy function
 	RET
@@ -312,4 +350,3 @@ MAPSUP:			;Dummy function
 
 CSEG	ENDS
 	END
-