Make use of single character variable syntax for the formal parameter variable.

[cc65] / libsrc / c64 / c64-numpad.s

diff --git a/libsrc/c64/c64-numpad.s b/libsrc/c64/c64-numpad.s
index 9d8df253a13da2ea999d59bc7d9e773f9977a92e..a224be57a859e913013f7e265b8a44122a185236 100644 (file)
--- a/libsrc/c64/c64-numpad.s
+++ b/libsrc/c64/c64-numpad.s
@@ -32,16 +32,17 @@
        .byte   $20                     ; JOY_LEFT      "4"
        .byte   $08                     ; JOY_RIGHT     "6"
        .byte   $04                     ; JOY_FIRE      "5" ENTER
-       .byte   $00                     ; Future expansion
+       .byte   $00                     ; JOY_FIRE2 unavailable
        .byte   $00                     ; Future expansion
        .byte   $00                     ; Future expansion
 
 ; Jump table.
 
-       .word   INSTALL
-       .word   UNINSTALL
-       .word   COUNT
-       .word   READ
+               .addr   INSTALL
+               .addr   UNINSTALL
+               .addr   COUNT
+               .addr   READ
+        .addr   0                       ; IRQ entry unused
 
 ; ------------------------------------------------------------------------
 ; Constants
@@ -63,13 +64,12 @@ JOY_COUNT   = 1             ; Number of joysticks we support
 ;
 
 INSTALL:
-       lda     VIC_CLK_128
-       cmp     #$FF
-       bne     @C128
-       lda     #JOY_ERR_NO_DEVICE
-       .byte   $2C
-@C128: lda     #JOY_ERR_OK
-       ldx     #0
+        lda     #JOY_ERR_OK             ; Assume we have a joystick
+        ldx     VIC_CLK_128             ; Test for a C128
+        cpx     #$FF
+        bne     @C128                   ; Jump if we have one
+        lda     #JOY_ERR_NO_DEVICE      ; No C128 -> no numpad
+@C128:  ldx     #0                      ; Set high byte
 
 ;      rts                     ; Run into UNINSTALL instead