From 102ca9438ec1618d2c8dc79edaaa73b3e6c39aea Mon Sep 17 00:00:00 2001
From: Michaelangel007 <michaelangel007@sharedcraft.com>
Date: Wed, 19 Jul 2017 09:16:13 -0700
Subject: [PATCH] More qkumba's optimizations: 673

---
 README.md   |   2 +-
 linuxlogo   | Bin 681 -> 673 bytes
 linuxlogo.s |  24 +++++++++---------------
 ll_6502.dsk | Bin 143360 -> 143360 bytes
 4 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/README.md b/README.md
index 021716c..47d5bc2 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 Linux Logo in 6502 assembly language.
 
-Size: 681 ($2A9) bytes
+Size: 673 ($2A1) bytes
 
 
 # Screenshots
diff --git a/linuxlogo b/linuxlogo
index cfc7f1f007e583c7728d52b507acb40253d678ad..1b330feccb777cd9a2567353807bab993f8af891 100644
GIT binary patch
delta 158
zcmV;P0Ac^B1)&9yBo@62jJ^tuzY3|Kjf@JSwxG3+jS7s8kvb+uoeGYg3XGo$&>XG6
z`|t+I;Lzak45{OdjS8*5`^g2+1)>2U*$It-z>R^xsRxB6pa6vZg!!${3Wff;&<chB
zq5y{cAl{Lv9~f5(ktpcMz$no5<|U;i$rsS*#wDq%oxhRa6%q<2`-l+wIBKT(9ne3W
M&_AX9vkU>90WFMAVE_OC

delta 183
zcmV;o07(C#1*rv)Bo@UAjK&I$#|o*Sjg$(awxG3+l?sfOkvb+wr3#Lw3XG=;&>XG6
z`|t+I;Lzak45{Odl?tuD`^g2+1)>2U+X;<<z>R^xsRxB6sQ{>|h5d#3t=9^L{<+u+
zh5w=ehWsGlk)|I-UkZ^Z=*Yk*(Dmjer6tK1(CEe`sjHpG3WWNl{t603{wWMa{wWWl
l0EYXd{qP0~Ci{rc`U)odIBKT(9ne3W&_AX97_$TcodE`$T(1BC

diff --git a/linuxlogo.s b/linuxlogo.s
index e54600d..30e4a3c 100644
--- a/linuxlogo.s
+++ b/linuxlogo.s
@@ -163,11 +163,10 @@ Unpack
 
         lda #7              ; will INC, $0428 (Text) + $1C00 => $2028 (HGR)
         sta zCursorY        ; Start Row=8
-        lda #0
-        tay   
-        tax                 ; SrcShift=0
-        sta zDstShift
-        sta zDstOffset
+
+        ldy #0              ; zSrcOffset
+        sty zDstShift
+        sty zDstOffset
 
         lda PackedBits
         sta zUnpackBits+0
@@ -175,7 +174,7 @@ Unpack
 NextSrcShift
         lda PackedBits+1,Y
         sta zUnpackBits+1
-        ldx #0
+        ldx #0              ; zSrcShift
 UpdateSrcShift
         stx zSrcShift
 
@@ -277,16 +276,12 @@ Unpack2Bits
         stx zMask
 
         ldy zDstShift       ; which 280 px column is next pixel writing to?
-        beq NoShiftSherlock
 MakeShiftMask
-        asl
-        rol zMask
-        dey
-        bne MakeShiftMask
-NoShiftSherlock
-
         asl                 ; msb of byte0 set?
         rol zMask           ; shift in to lsb of byte1
+        dey
+        bpl MakeShiftMask
+
         sec                 ; MSB=1 color=blue/orange
         ror
         ldx zDstOffset
@@ -294,8 +289,7 @@ NoShiftSherlock
         sta UnpackAddr,X
 
         lda zDstShift       ; x={0,1,2} + 4 < 7
-        clc
-        adc #4
+        adc #4              ; C=0 from ASL ROR above
         cmp #7              ; all bits fit into dest byte?
         bcc FitSameByte
 
diff --git a/ll_6502.dsk b/ll_6502.dsk
index 3074eeeb841fcd94a1897f4166eb458218cf21b9..1ec32e679e9c33c146bafa415ace1fb9b135e020 100644
GIT binary patch
delta 198
zcmV;%06G7F;0S==2!ON!0cw{aTmj#c5DFj&9ne3W&_AX9mk?_K@C*On|NsC0|Nj69
zp_c<}0VNi_3XHxAjlT-1ppA?QqPC#5j*SY8j+Z`O0VWxp3XYx%jGqe79Ie3n@CM1?
z(BSY4spE}}mwjFV7Z#uZg#Cp1t<MUD{<+W!h5w=ehWsGjm#l07A2(MDktpcMz$no5
z<|U;i$rsS*#wDq%oxci%`lbE~3Pt`Y3`PDa5265u`=tE}Ci{pG`Z#K)`KE0F!;5QR
A=>Px#

delta 203
zcmV;+05t!A;0S==2!ON!0cr=||NsC0|NoY10r(IKCi^&QruiMvKb_D&rTrL}2x|fG
z0{{uBmji48B^JdBjK&I$#|o*Sjg$(awxG3+l?sfOmp)zrCP<|Uj;0EXrwY&<t-$;6
z2Fc*i;P4Eo<BgRHt-t%p1<(be0U+B6je)?8fxxK;g(ax~sH%nih54=53Wff;*b0UJ
zq5y{cAmEp(Yylq_UkZ^Z=*Yk*(Dmjer6tK1(CEe`sjHpGm*H#y6$tPK3MTuA(E6rr
F0mF)~WgGwi