support Star Maze (#48)

src/anti-m.a

@@ -267,6 +267,8 @@ Tracer
          bcc   BeginTheBoot
          jsr   IDAlphaBeta
          bcc   BeginTheBoot
+         jsr   IDSirtech
+         bcc   BeginTheBoot
 ; [execution falls through here]
 ; [and runs anyway]
 
@@ -346,7 +348,7 @@ StringTable
          !word @mainmenu
 
 @header
-         !text "Anti-M v2.3 by 4am            2024-08-30"
+         !text "Anti-M v2.4-pre by 4am        2024-12-08"
          !text "________________________________________",$8D
          !text $8D,$8D,$8D,$8D,$8D,$8D,$8D,$8D,$00
 @mainmenu
@@ -365,3 +367,4 @@ StringTable
          !src  "src/idpersonal.a"
          !src  "src/idalphabeta.a"
          !src  "src/idsensible.a"
+         !src  "src/idsirtech.a"

src/idsirtech.a

@@ -0,0 +1,27 @@
+; Sir-Tech tracer
+; written by qkumba
+;
+; tested on
+; - Star Maze
+;
+IDSirtech
+         lda   #8
+         ldx   #21
+         ldy   #12
+         jsr   CompareMemory
+         !byte $B9,$00,$0B      ;LDA $0B00,Y
+         !byte $99,$00,$07      ;STA $0700,Y
+         !byte $C8              ;INY
+         !byte $D0,$E5          ;BNE *-$19
+         !byte $4C,$21,$04      ;JMP $0421
+         bcs   @exit
+; replace undocumented opcode with real do-nothing
+         lda   #$EA
+         sta   $84B
+         lda   #$A9
+         sta   $85E
+         sta   $87C
+         clc
+
+@exit
+         rts