Tweak joystick code to make it more forgiving about center

Makefile

@@ -16,8 +16,16 @@ MAPFILE=curta.map
 
 all:    $(BIN)
 
+# Big hack here.  The joystick library from cc65 only considers a
+# jostick centered if it is within 20 of 127 which is very tight.
+# Thus the tests for $6B and $93.  The good news is that the only
+# occurrences of these bytes in the binary image are for these
+# comparisons.  So, I just do a global search and replace.  The
+# new threshold I am using is +/- 60 from 127.
 a2e.stdjoy.s:
 	co65 --code-label _a2e_stdjoy -o $@ $(CC65_HOME)/joy/a2e.stdjoy.joy
+	sed -i .tmp 's/\$$6B/$$43/g' a2e.stdjoy.s
+	sed -i .tmp 's/\$$93/$$BB/g' a2e.stdjoy.s
 
 a2e.hi.s:
 	co65 --code-label _a2e_hi -o $@ $(CC65_HOME)/tgi/a2e.hi.tgi

a2e.stdjoy.s.tmp

@@ -0,0 +1,119 @@
+;
+; File generated by co65 v 2.13.3 using model `cc65-module'
+;
+.fopt		compiler,"co65 v 2.13.3"
+.case		on
+.debuginfo	off
+.export		_a2e_stdjoy
+
+;
+; CODE SEGMENT
+;
+.segment	"CODE"
+_a2e_stdjoy:
+	.byte	$6A
+	.byte	$6F
+	.byte	$79
+	.byte	$01
+	.byte	$10
+	.byte	$20
+	.byte	$04
+	.byte	$08
+	.byte	$40
+	.byte	$80
+	.byte	$00
+	.byte	$00
+	.word	_a2e_stdjoy+22
+	.word	_a2e_stdjoy+26
+	.word	_a2e_stdjoy+27
+	.word	_a2e_stdjoy+32
+	.byte	$00
+	.byte	$00
+	.byte	$A9
+	.byte	$00
+	.byte	$A2
+	.byte	$00
+	.byte	$60
+	.byte	$A9
+	.byte	$02
+	.byte	$A2
+	.byte	$00
+	.byte	$60
+	.byte	$2C
+	.byte	$82
+	.byte	$C0
+	.byte	$29
+	.byte	$01
+	.byte	$0A
+	.byte	$AA
+	.byte	$20
+	.byte	$1E
+	.byte	$FB
+	.byte	$A9
+	.byte	$00
+	.byte	$C0
+	.byte	$43
+	.byte	$6A
+	.byte	$C0
+	.byte	$93
+	.byte	$6A
+	.byte	$48
+	.byte	$E8
+	.byte	$20
+	.byte	$1E
+	.byte	$FB
+	.byte	$68
+	.byte	$C0
+	.byte	$43
+	.byte	$6A
+	.byte	$C0
+	.byte	$93
+	.byte	$6A
+	.byte	$A8
+	.byte	$BD
+	.byte	$60
+	.byte	$C0
+	.byte	$0A
+	.byte	$98
+	.byte	$6A
+	.byte	$A8
+	.byte	$E8
+	.byte	$8A
+	.byte	$29
+	.byte	$03
+	.byte	$AA
+	.byte	$BD
+	.byte	$60
+	.byte	$C0
+	.byte	$0A
+	.byte	$98
+	.byte	$6A
+	.byte	$49
+	.byte	$14
+	.byte	$A2
+	.byte	$00
+	.byte	$2C
+	.byte	$80
+	.byte	$C0
+	.byte	$60
+
+;
+; DATA SEGMENT
+;
+.segment	"DATA"
+DATA:
+
+;
+; BSS SEGMENT
+;
+.segment	"BSS"
+BSS:
+	.res	0
+
+;
+; ZEROPAGE SEGMENT
+;
+.import	__ZP_START__		; Linker generated symbol
+ZEROPAGE = __ZP_START__
+
+.end