Fix Lunar Lander to assemble with PALX.

- Add definitions for registers.
- Change starting location from 0 to 400.

src/gt40/gtlem.91

@@ -10,7 +10,20 @@
 ;			P.O. BOX 411
 ;			MAYNARD, MASS.
 ;					01754
+;
+;	GTLEM.91,	AUGUST 1, 2018
+;	UPDATED FOR PALX BY LARS BRINKHOFF
 ;*********************************************************************
+
+	R0=%0
+	R1=%1
+	R2=%2
+	R3=%3
+	R4=%4
+	R5=%5
+	SP=%6
+	PC=%7
+
 	IN1=R0				;INPUT REGISTER FOR SUBROUTINE CALLING.
 	IN2=R1				;SECOND VALUE.
 	RET1=R2				;HIGH ORDER PORTION OF SUBROUTINE RETURN.
@@ -111,6 +124,7 @@
 ;		ZERO DEGREES IS AT THE TOP, 90 TO THE RIGHT, ETC.
 ;			M A I N   D A T A   A R E A .
 ;
+	.=400
 TURN:	.WORD	0			;PRESENT RATE OF TURN AS SELECTED BY USER.
 ANGLE:	.WORD	0			;ANGLE CURRENTLY BEING USED FOR TRIG CALCULATIONS.
 ANGLER:	.WORD	0			;REMAINDER OF ANGLE FOR TURNING.