Added Inkwell lightpen drivers for the C64 and the C128.

They use the mouse driver programming interface.

Added a test program for lightpen drivers.  Now, it knows about only those two drivers; it will need updating when others are added.

asminc/c128.inc

@@ -1,5 +1,5 @@
 ;
-; C64 generic definitions. Stolen from Elite128
+; C128 generic definitions. Stolen from Elite128
 ;
 
 
@@ -32,7 +32,7 @@ FETVEC          := $2AA         ; Vector patch location for FETCH
 STASH           := $2AF         ; Stash routine in RAM
 STAVEC          := $2B9         ; Vector patch location for STASH
 PALFLAG         := $A03         ; $FF=PAL, $00=NTSC
-INIT_STATUS     := $A04         ; Flag: Reset/NMI Status
+INIT_STATUS     := $A04         ; Flags: Reset/Restore initiation status
 FKEY_LEN        := $1000        ; Function key lengths
 FKEY_TEXT       := $100A        ; Function key texts
 
@@ -102,6 +102,9 @@ VIC_CTRL2       := $D016
 
 VIC_HLINE       := $D012
 
+VIC_LPEN_X      := $D013
+VIC_LPEN_Y      := $D014
+
 VIC_VIDEO_ADR   := $D018
 
 VIC_IRR         := $D019        ; Interrupt request register

asminc/c64.inc

@@ -95,6 +95,9 @@ VIC_CTRL2       := $D016
 
 VIC_HLINE       := $D012
 
+VIC_LPEN_X      := $D013
+VIC_LPEN_Y      := $D014
+
 VIC_VIDEO_ADR   := $D018
 
 VIC_IRR         := $D019        ; Interrupt request register
@@ -207,4 +210,3 @@ TP_FAST         = $80           ; Switch Rossmoeller TurboProcess to fast mode
 
 RAMONLY         = $F8           ; (~(LORAM | HIRAM | IOEN)) & $FF
 
-