Fixes after testing of convert int to FAC functions

src/basic/math/b3a2.convert_Y_to_FAC1.s

@@ -18,7 +18,7 @@
 ;
 
 convert_Y_to_FAC1:
+    sty FAC1_mantissa+1
     lda #$00
-    sta FAC1_mantissa+1
-    sty FAC1_mantissa
+    sta FAC1_mantissa
     jmp convert_i16_to_FAC1

src/basic/math/bc3c.convert_A_to_FAC1.s

@@ -17,8 +17,8 @@
 
 
 convert_A_to_FAC1:
-    sta FAC1_mantissa
+    sta FAC1_mantissa+1
     jsr sign_extend_A_to_Y
-    sty FAC1_mantissa+1
+    sty FAC1_mantissa
     +nop                    ; To not leave a gap to the fallthrough
     ; Fall through to convert_i16_to_FAC1

src/basic/math/bc44.convert_i16_to_FAC1.s

@@ -24,6 +24,6 @@ convert_i16_to_FAC1:
 
 
 carry:
-    lda FAC1_mantissa+1
+    lda FAC1_mantissa
     cmp #$80                    ; Copy sign into carry
     rts

src/basic/math/convert_i16_expsign_to_FAC1.s

@@ -12,12 +12,12 @@ convert_i16_expsign_to_FAC1:
     sta FAC1_mantissa+3
     stx FAC1_exponent
     sta FAC1_sign
-    bcs @1
+    bcc @1
 
     ; Handle signed int
-    lda FAC1_mantissa+1          ; Clear sign bit of int 16
+    lda FAC1_mantissa            ; Clear sign bit of int 16
     and #$7F
-    sta FAC1_mantissa+1
+    sta FAC1_mantissa
     ldy #>CONST_NEG_32768       ; Subtract with 32768 to invert negative number
     lda #<CONST_NEG_32768
     jsr add_MEM_FAC1