diff --git a/player/main.s b/player/main.s
index 2f97700..d1e3b4c 100644
--- a/player/main.s
+++ b/player/main.s
@@ -397,7 +397,7 @@ _op_header_hgr:
 ; Y register has the high byte of the W5100 address pointer in the RX socket code, so we
 ; can't trash this until we are ready to point back there.
 checkrecv:
-    BIT TICK        ; 4
+    STA TICK        ; 4
 
     LDA #<S0RXRSR   ; 2 Socket 0 Received Size register
     STA WADRL       ; 4
@@ -440,7 +440,7 @@ recv: ; 15 cycles so far
     ; X will usually already be 0 from op_ack except during first frame when reading
     ; header but reset it unconditionally
     LDX #$00 ; 2
-    BIT TICK ; 4 ; 36
+    STA TICK ; 4 ; 36
 
     NOP ; 2
     STA dummy ; 4
@@ -464,7 +464,7 @@ op_nop:
 ; - read 2 bytes from the stream as address of next opcode
 ;
 ; Each opcode has 6 cycles of padding, which is necessary to support reordering things to
-; get the second "BIT TICK" at the right cycle offset.
+; get the second "STA TICK" at the right cycle offset.
 ;
 ; Where possible we share code by JMPing to a common tail instruction sequence in one of the
 ; earlier opcodes.  This is critical for reducing code size enough to fit.
@@ -480,8 +480,8 @@ op_nop:
 .macro op_tick_4 page
 ;4+(4)+2+4+4+4+5+4+5+4+5+4+5+4+4+4+4+3=73
 .ident (.concat ("op_tick_4_page_", .string(page))):
-    BIT TICK ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     STA zpdummy ; 3
@@ -524,9 +524,9 @@ tickident page, 7
 .macro op_tick_6 page
 ;4+(2+4)+3+4+4+5+4+5+4+5+4+5+4+4+4+5+3
 .ident (.concat ("op_tick_6_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
 
@@ -569,9 +569,9 @@ tickident page, 8
 .macro op_tick_8 page
 ;4+(4+4)+3+3+55
 .ident (.concat ("op_tick_8_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_55")) ; 3 + 55
@@ -580,10 +580,10 @@ tickident page, 8
 .macro op_tick_10 page
 ;4+(4+2+4)+3+56
 .ident (.concat ("op_tick_10_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_56")) ; 3 + 56
 .endmacro
@@ -591,10 +591,10 @@ tickident page, 8
 .macro op_tick_12 page
 ;4+(4+4+4)+3+3+51
 .ident (.concat ("op_tick_12_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_51")) ; 3 + 51
@@ -603,11 +603,11 @@ tickident page, 8
 .macro op_tick_14 page
 ;4+(4+4+2+4)+3+52
 .ident (.concat ("op_tick_14_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_52")) ; 3+52
 .endmacro
@@ -615,14 +615,14 @@ tickident page, 8
 .macro op_tick_16 page
 ; 4+(4+4+4+4)+5+2+3+43
 .ident (.concat ("op_tick_16_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     ; This temporarily violates X=0 invariant required by tick_6, but lets us share a
     ; common opcode tail; otherwise we need a dummy 4-cycle opcode between the ticks, which
     ; doesn't leave enough to JMP with.
     LDX WDATA ; 4
     LDY WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
     
     STA page << 8,x ; 5
     LDX #$00 ; 2 restore X=0 invariant
@@ -633,14 +633,14 @@ tickident page, 8
 .macro op_tick_18 page
 ; 4 + (4+4+4+2+4)+5+5+2+2+4+5+4+5+4+4+4+4+3
 .ident (.concat ("op_tick_18_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     ; lets us reorder the 5-cycle STA page << 8,y outside of tick loop.
     ; This temporarily violates X=0 invariant required by tick_6
     LDX WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA page << 8,Y ; 5
     STA page << 8,X ; 5
@@ -667,12 +667,12 @@ tickident page, 8
 .macro op_tick_20 page
 ;4+(4+4+5+3+4)+3+46=73
 .ident (.concat ("op_tick_20_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_46"))
 .endmacro
@@ -681,12 +681,12 @@ tickident page, 8
 .macro op_tick_22 page
 ; 4+(4+4+5+4+4)+3+3+42
 .ident (.concat ("op_tick_22_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_42")) ; 3 + 42
@@ -695,13 +695,13 @@ tickident page, 8
 .macro op_tick_24 page
 ;4+(4+4+5+4+3+4)+3+42
 .ident (.concat ("op_tick_24_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_42"))
 .endmacro
@@ -709,13 +709,13 @@ tickident page, 8
 .macro op_tick_26 page ; pattern repeats from op_tick_8
 ; 4+(4+4+5+4+5+4)+3+37
 .ident (.concat ("op_tick_26_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA page << 8,Y ; 5
-    BIT TICK; 4
+    STA TICK; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_37")) ; 3 + 37
@@ -724,14 +724,14 @@ tickident page, 8
 .macro op_tick_28 page ; pattern repeats from op_tick_10
 ; 4+(4+2+4+5+4+5+4)+3+38
 .ident (.concat ("op_tick_28_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_38"))
 .endmacro
@@ -739,14 +739,14 @@ tickident page, 8
 .macro op_tick_30 page ; pattern repeats from op_tick_12
 ;4+(4+4+5+4+5+4+4)+3+3+33
 .ident (.concat ("op_tick_30_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_33")) ; 3 + 33
@@ -755,7 +755,7 @@ tickident page, 8
 .macro op_tick_32 page ; pattern repeats from op_tick_14
 ;4+(4+4+5+4+5+4+2+4)+3+34
 .ident (.concat ("op_tick_32_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -763,7 +763,7 @@ tickident page, 8
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_34"))
 .endmacro
@@ -771,7 +771,7 @@ tickident page, 8
 .macro op_tick_34 page ; pattern repeats from op_tick_16
 ; 4+(4+4+5+4+5+4+4+4)+2+5+5+3+20
 .ident (.concat ("op_tick_34_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -779,7 +779,7 @@ tickident page, 8
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     LDX WDATA ; 4 ; allows reordering STA ...,X outside ticks
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA page << 8,Y ; 5
     STA page << 8,X ; 5
@@ -792,7 +792,7 @@ tickident page, 8
 .macro op_tick_36 page ; pattern repeats from op_tick_18
 ;4+(4+4+5+4+5+4+4+2+4)+5+5+2+2+4+4+4+4+3
 .ident (.concat ("op_tick_36_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -801,7 +801,7 @@ tickident page, 8
     LDY WDATA ; 4
     LDX WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA page << 8,Y ; 5
     STA page << 8,X ; 5
@@ -820,7 +820,7 @@ tickident page, 8
 .macro op_tick_38 page ; pattern repeats from op_tick_20
 ; 4 + (4+4+5+4+5+4+5+3+4)+3+28
 .ident (.concat ("op_tick_38_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -829,7 +829,7 @@ tickident page, 8
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_28")) ; 3 + 28
 .endmacro
@@ -838,7 +838,7 @@ tickident page, 8
 .macro op_tick_40 page ; pattern repeats from op_tick_22
 ;4+(4+4+5+4+5+4+5+4+4)+3+3+24
 .ident (.concat ("op_tick_40_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -847,7 +847,7 @@ tickident page, 8
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     LDY WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_24"))
@@ -856,7 +856,7 @@ tickident page, 8
 .macro op_tick_42 page ; pattern repeats from op_tick_24
 ;4+(4+4+5+4+5+4+5+4+3+4)+3+24
 .ident (.concat ("op_tick_42_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -866,7 +866,7 @@ tickident page, 8
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
     
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_24")) ; 3 + 24
 .endmacro
@@ -874,7 +874,7 @@ tickident page, 8
 .macro op_tick_44 page ; pattern repeats from op_tick_26
 ; 4 + (4+4+5+4+5+4+5+4+5+4)+3+3+19
 .ident (.concat ("op_tick_44_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -884,7 +884,7 @@ tickident page, 8
     STA page << 8,Y ; 5
     LDY WDATA ; 4
     STA page << 8,Y ; 5
-    BIT TICK; 4
+    STA TICK; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_19")) ; 3 + 19
@@ -893,7 +893,7 @@ tickident page, 8
 .macro op_tick_46 page ; pattern repeats from op_tick_28
 ;4+(4+2+4+5+4+5+4+5+4+5+4)+3+20
 .ident (.concat ("op_tick_46_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -904,7 +904,7 @@ tickident page, 8
     LDY WDATA ; 4
     STA page << 8,Y ; 5
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_20"))
     .endmacro
@@ -912,7 +912,7 @@ tickident page, 8
 .macro op_tick_48 page ; pattern repeats from op_tick_30
 ;4+(4+4+5+4+5+4+5+4+5+4+4)+3+3+15
 .ident (.concat ("op_tick_48_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -924,7 +924,7 @@ tickident page, 8
     STA page << 8,Y ; 5
 
     LDA WDATA ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     STA zpdummy ; 3
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_15")) ; 3 + 15
@@ -933,7 +933,7 @@ tickident page, 8
 .macro op_tick_50 page ; pattern repeats from op_tick_32
 ;4+(4+4+5+4+5+4+5+4+5+4+2+4)+3+16
 .ident (.concat ("op_tick_50_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -946,7 +946,7 @@ tickident page, 8
 
     LDA WDATA ; 4
     NOP ; 2
-    BIT TICK ; 4
+    STA TICK ; 4
 
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_16"))
 .endmacro
@@ -954,7 +954,7 @@ tickident page, 8
 .macro op_tick_52 page ; pattern repeats from op_tick_34
 ;4+(4+4+5+4+5+4+5+4+5+4+4+4)+2+3+12
 .ident (.concat ("op_tick_52_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -967,7 +967,7 @@ tickident page, 8
 
     LDA WDATA ; 4
     STA .ident (.concat ("_op_tick_6_page_", .string(page), "_jmp"))+2 ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
     NOP ; 2
 
     JMP .ident(.concat("_op_tick_page_", .string(page), "_tail_12"))
@@ -976,7 +976,7 @@ tickident page, 8
 .macro op_tick_54 page ; pattern repeats from op_tick_36
 ; 4 + (4+4+5+4+5+4+5+3+3+4+5+4+4)+4+4+4+3
 .ident (.concat ("op_tick_54_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -992,7 +992,7 @@ tickident page, 8
     STA zpdummy ; 3
     STA zpdummy ; 3
 
-    BIT TICK ; 4
+    STA TICK ; 4
 
     ; used >3 pad cycles between tick pair; can't branch to tail
     STA @D+2 ; 4
@@ -1005,7 +1005,7 @@ tickident page, 8
 .macro op_tick_56 page
 ; 4+(4+4+5+4+5+4+5+4+5+4+4+4+4)+2+4+4+3
 .ident (.concat ("op_tick_56_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1020,7 +1020,7 @@ tickident page, 8
     STA @D+2 ; 4
 
     STA dummy ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     ; used >3 pad cycles between tick pair; can't branch to tail
     NOP ; 2
@@ -1034,7 +1034,7 @@ tickident page, 8
 .macro op_tick_58 page ; pattern repeats from op_tick_40
 ;4+(4+4+5+4+5+4+5+4+5+4+4+3+3+4)+4+4+3
 .ident (.concat ("op_tick_58_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1050,7 +1050,7 @@ tickident page, 8
 
     STA zpdummy ; 3
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
 
     ; used >3 pad cycles between tick pair; can't branch to tail
     LDA WDATA ; 4
@@ -1062,7 +1062,7 @@ tickident page, 8
 .macro op_tick_60 page
 ; 4+(4+4+5+4+5+4+5+4+5+4+4+4+4+4)+2+4+3
 .ident (.concat ("op_tick_60_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1079,7 +1079,7 @@ tickident page, 8
     LDA WDATA ; 4
 
     STA dummy ; 4
-    BIT TICK ; 4
+    STA TICK ; 4
 
     ; used >3 pad cycles between tick pair; can't branch to tail
     NOP ; 2
@@ -1091,7 +1091,7 @@ tickident page, 8
 .macro op_tick_62 page
 ;4+(4+4+5+4+5+4+5+4+5+4+4+4+3+3+4)+4+3
 .ident (.concat ("op_tick_62_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1108,7 +1108,7 @@ tickident page, 8
 
     STA zpdummy ; 3
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
     
     ; used >3 pad cycles between tick pair; can't branch to tail
     STA @D+1 ; 4
@@ -1119,7 +1119,7 @@ tickident page, 8
 .macro op_tick_64 page
 ;4+(4+4+5+4+5+4+5+4+5+4+4+4+4+4+4)+2+3
 .ident (.concat ("op_tick_64_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1137,7 +1137,7 @@ tickident page, 8
     STA @D+1 ; 4
     STA dummy ; 4
 
-    BIT TICK ; 4
+    STA TICK ; 4
     NOP ; 2
 
 @D:
@@ -1147,7 +1147,7 @@ tickident page, 8
 .macro op_tick_66 page ; pattern repeats from op_tick_8
 ; 4+(4+4+5+4+5+4+5+4+5+4+4+4+3+4+3+4)+3
 .ident (.concat ("op_tick_66_page_", .string(page))):
-    BIT TICK ; 4
+    STA TICK ; 4
     LDA WDATA ; 4
     LDY WDATA ; 4
     STA page << 8,Y ; 5
@@ -1166,7 +1166,7 @@ tickident page, 8
 
     STA zpdummy ; 3
     STA zpdummy ; 3
-    BIT TICK ; 4
+    STA TICK ; 4
 
 @D:
     JMP op_nop ; 3
@@ -1293,7 +1293,7 @@ op_terminate:
 ; the last 4 bytes in a 2K "TCP frame".  i.e. we can assume that we need to consume
 ; exactly 2K from the W5100 socket buffer.
 op_ack:
-    BIT TICK ; 4
+    STA TICK ; 4
 
     ; allow flip-flopping the PAGE1/PAGE2 soft switches to steer writes to MAIN/AUX screens
     ; actually this allows touching any $C0XX soft-switch, in case that is useful somehow
@@ -1314,7 +1314,7 @@ op_ack:
     LDX #<S0RXRD ; 2
     STX WADRL ; 4
 
-    BIT TICK ; 4 (36)
+    STA TICK ; 4 (36)
 
     LDA WDATA ; 4 Read high byte
     ; No need to read low byte since it's guaranteed to be 0 since we're at the end of a 2K frame.
@@ -1339,7 +1339,7 @@ op_ack:
     ; - used as the low byte for resetting the W5100 address pointer when we're ready to start processing more data
     LDX #$00 ; 2 restore invariant for dispatch loop
 
-    JMP checkrecv ; 3 (37 with following BIT TICK)
+    JMP checkrecv ; 3 (37 with following STA TICK)
 
 ; Quit to ProDOS
 exit: