fix #6, isseu found elsewhere. Improved 'xex' command, and print return value from the program

lib/xex.nasm

@@ -2,8 +2,8 @@
 ; This is the "program" to execute a program 
 xex: 
 	pusha ; save state before program
-    ;sub sp, 2048
-    ;mov [.program_executable_buffer], sp
+    sub sp, 512
+    mov [.program_executable_buffer], sp
     
     ;mov [.program_executable_buffer], sp
 
@@ -22,6 +22,10 @@ xex:
     mov si, .welcome_xex_enter_fileindex
     call print
 
+	; Ask the user for the filename  
+    xor bx, bx
+    xor cx, cx ; are going to be the counter
+    xor dx, dx
 .enter_fileindex_loop:
     push cx
 .loop_no_push:    
@@ -75,18 +79,11 @@ xex:
     mov BYTE [bx], 0
     mov si, [.program_executable_buffer]
     call zstring_to_integer ; ax now contain the interger index for the file
-	mov ax, 3   
-    call dumpax
     mov [.fileindex_for_open_file], ax ; save the file index
 
     
     mov ax, [.fileindex_for_open_file]
     mov bx, [.program_executable_buffer]
-    
-	
-
-
-
 
 .xex_lsfs_read_file:
     ; INPUT ax = file index
@@ -98,7 +95,6 @@ xex:
 
 	mov dx, 24 ; LSFS_magic_start_sector
     add ax, dx  ; senctor number, into the master Table. 
-    call dumpax
     mov WORD  [XEXPACK.db_addr_offset], xex_lsfs_loading_buffer
     mov WORD  [XEXPACK.lba_addr_dw_low], ax
     mov WORD  [XEXPACK.blkcnt], 0x1  ; Read to sectors, that is what the space is for the buffer in svim
@@ -113,7 +109,6 @@ xex:
     ; Save the buffer addr
     mov bx, [xex_lsfs_loading_buffer + 288] ; this is the first data pointer
     mov ax, bx
-    call dumpax
     mov WORD [XEXPACK.lba_addr_dw_low], bx
     mov WORD [XEXPACK.blkcnt], 0x4  ; Read to sectors, that is what the space is for the buffer in svim
     mov WORD [XEXPACK.db_addr_segment], 0x2000
@@ -138,17 +133,24 @@ xex:
     retf
 
     .this_place:
+    push ax
+    call printCRLF
+	mov si, .program_output_text
+    call print
+    pop ax
+    call dumpax
     ;mov bx, ss
     ;call bx:ax ; here. We want to execute the file that we just have benn loaded in memory 
     		   ; The executable should make use of the global systemcall table. 
     		   ; That is what we are trying to get to work here. 
 
-    ;add sp, 2048
+    add sp, 512
     popa ; retore
     ret
 
 
 .welcome_xex_enter_fileindex db 'Enter program index to execute: ', 0
+.program_output_text db 'Program has terminated with return value: ', 0
 .fileindex_for_open_file dw 0
 .program_executable_buffer dw 0