Create loader.asm

loader is to allow ramtest to be run as a regular CP/M program.  Relocates ramtest into upper RAM page for execution

Source/Apps/ramtest/loader.asm

@@ -0,0 +1,55 @@
+;	Z80
+;***********************************
+;*	Z80 TEST PROTOTYPE
+;*	LOAD MONITOR FROM ROM INTO RAM AND EXECUTE PROGRAM
+;*	ANDREW LYNCH
+;*	LYNCHAJ@YAHOO COM
+;*	15 FEB 2007
+;***********************************
+
+
+;********************* CONSTANTS ****************************************
+
+RAMTOP:		 .EQU	0FFFFh	; HIGHEST ADDRESSABLE MEMORY LOCATION
+MONSTART:	 .EQU	08000h	; START OF 6116 SRAM 2KB X 8 RAM F800H-FFFFH
+RAMBOTTOM:	 .EQU	08000h	; BEGINNING OF UPPER 32K RAM PAGE
+END:		 .EQU	0FFh	; MARK END OF TEXT
+CR:		 .EQU	0DH	; ASCII CARRIAGE RETURN CHARACTER
+LF:		 .EQU	0AH	; ASCII LINE FEED CHARACTER
+ESC:		 .EQU	1BH	; ASCII ESCAPE CHARACTER
+
+ROMSTART_MON:	 .EQU	00200h	; WHERE THE DBGMON IS STORED IN ROM
+RAMTARG_MON:	 .EQU	08000h	; WHERE THE DBGMON STARTS IN RAM (ENTRY POINT)
+MOVSIZ_MON:	 .EQU	01000h	; DBGMON IS 4096 BYTES IN LENGTH
+
+MON_ENTRY:	 .EQU	08000h	; DBGMON ENTRY POINT (MAY CHANGE)
+
+
+
+;*******************************************************************
+;*	START AFTER RESET
+;*	FUNCTION	: READY SYSTEM, LOAD MONITOR INTO RAM AND START
+;*******************************************************************
+
+	.ORG	00100h
+
+;	DI			; DISABLE INTERRUPT
+	LD	SP,RAMTOP	; SET STACK POINTER TO TOP OF RAM
+;	IM	1		; SET INTERRUPT MODE 1
+
+	LD	HL,ROMSTART_MON	; WHERE IN ROM DBGMON IS STORED (FIRST BYTE)
+	LD	DE,RAMTARG_MON	; WHERE IN RAM TO MOVE MONITOR TO (FIRST BYTE)
+	LD	BC,MOVSIZ_MON	; NUMBER OF BYTES TO MOVE FROM ROM TO RAM
+	LDIR			; PERFORM BLOCK COPY OF DBGMON TO UPPER RAM PAGE
+
+;	EI			; ENABLE INTERRUPTS (ACCESS TO MONITOR WHILE CP/M RUNNING)
+
+	JP	MON_ENTRY	; JUMP TO START OF MONITOR
+
+	.FILL	001FFh-$
+
+	.ORG	001FFh
+FLAG:
+	.DB	0FFh
+
+	.END