From 381b9d79121854fca428d43b00fbbdebdc0cca83 Mon Sep 17 00:00:00 2001
From: Michaelangel007 <michaelangel007@sharedcraft.com>
Date: Thu, 6 Jul 2017 15:54:01 -0700
Subject: [PATCH] Save off 2 bytes for zp version

---
 README.md         |  20 ++++++++++----------
 print_uint16_zp   | Bin 76 -> 74 bytes
 print_uint16_zp.s |   6 ++----
 3 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/README.md b/README.md
index 6a7ecf3..f255a0e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Features:
 
 * Highly optimized for space
 * No zero-page usage   [version](print_uint16.s)    79 ($4F) bytes
-* With zero-page usage [version](print_uint16_zp.s) 69 ($45) bytes
+* With zero-page usage [version](print_uint16_zp.s) 67 ($43) bytes
 * With stack var usage [version](print_uint16_sp.s) 83 ($53) bytes
 * Only 2 ROM entry points used: PRHEXZ, SCRN2
 * Includes 7 byte demo
@@ -35,15 +35,15 @@ With-Zero-Page version:
 
 ```asm
 0900:A9 12 A2 34 4C 07 09 86
-0908:FC 48 A0 00 84 FD 84 FE
-0910:84 FF A0 10 F8 06 FC 68
-0918:2A 48 A2 FD B5 00 75 00
-0920:95 00 E8 D0 F7 88 D0 ED
-0928:68 D8 A0 03 B9 FC 00 20
-0930:39 09 88 D0 F7 8A F0 0E
-0938:60 48 20 7B F8 20 43 09
-0940:68 29 0F D0 01 CA E8 F0
-0948:EF 4C E5 FD
+0908:FC A0 00 84 FD 84 FE 84
+0910:FF A0 10 F8 06 FC 2A 48
+0918:A2 FD B5 00 75 00 95 00
+0920:E8 D0 F7 68 88 D0 ED D8
+0928:A0 03 B9 FC 00 20 37 09
+0930:88 D0 F7 8A F0 0E 60 48
+0938:20 7B F8 20 41 09 68 29
+0940:0F D0 01 CA E8 F0 EF 4C
+0948:E5 FD 
 ```
 
 With-Stack-Page version:
diff --git a/print_uint16_zp b/print_uint16_zp
index 256baccf772d388c16aa4788164f2e08139ce2f3..e4928cf4f153d92cee1d18af8b657e6761cdd6f8 100644
GIT binary patch
literal 74
zcmV-Q0JZ<A5~4Ir2MLD!pa6vZg#Lv8pb+>5{3=MI{j~sf0F?mf(D!JF(Cyfu1G)SF
gAU6q!(D#b)4q!+id-xzh31}$~&;iQm@b66J{bds+r~m)}

literal 76
zcmV-S0JHz85~4Ir2MLD!NT2|O{e=F6|DX`~2K;C$NTU6<0CfPB0O-*7h|uk5*q{Ts
i`~V<135d}5itr9#NFaOoAVUdgDG$&A%INU#Oy&KZgeF`7

diff --git a/print_uint16_zp.s b/print_uint16_zp.s
index 2fba519..02b1502 100644
--- a/print_uint16_zp.s
+++ b/print_uint16_zp.s
@@ -25,7 +25,6 @@ _bcd    = $fd   ; NOTE: MUST be at $FD for ZP,X addressing in _DoubleDabble
 ; ======================================================================
 PrintUint16
         STX _temp  
-        PHA             ; Optimized: STA _temp+1
 
         LDY #0
         STY _bcd+0
@@ -39,9 +38,8 @@ _Dec2BCD                ; https://en.wikipedia.org/wiki/Double_dabble
         ASL _temp+0     ;     abcd efgh | ijkl mnop |
 ;       ROL _temp+1     ; C=a bcde fghi | jklm nop0 |
 ;                       ; Bit 7654_3210 | 7654_3210 |
-        PLA
         ROL
-        PHA
+        PHA             ; Optimized: STA _temp+1
 
         LDX #$FD        ; $00-$FD=-3 bcd[0] bcd[1] bcd[2] bcd[3]
 _DoubleDabble           ;              Y=FD   Y=FE   Y=FF   Y=00
@@ -50,10 +48,10 @@ _DoubleDabble           ;              Y=FD   Y=FE   Y=FF   Y=00
         STA _bcd-$FD,X
         INX
         BNE _DoubleDabble
+        PLA             ; keep stack
         DEY
         BNE _Dec2BCD
 
-        PLA             ; keep stack
         CLD             ; X=0 = output length
 
 DecWidth