Create swdtech.py

bug_fixes/swdtech.py

@@ -0,0 +1,79 @@
+space = Reserve(0x017D5F, 0x017DCD, "Updated ArmorVil's SwdTech Speed-up patch")
+space.write(
+	# we start at C17D5F here, or at 0x017D5F in raw hex.
+	# we are going to rewrite and optimize the code here so ArmorVil's patch can be used without using any extra free space anywhere in the bank
+	asm.LDA(0x07, asm.IMM8),
+	asm.SEC(),
+	asm.SBC(0x2020, asm.ABS),
+	asm.TAX(),
+	asm.TDC(),
+	asm.TAY(),
+
+	"BRANCH_C17D6C",
+	asm.LDA(0x02A860, asm.LNG_X),
+	asm.STA(0x5DDA, asm.ABS_Y),
+	asm.INX(),
+	asm.INY(),
+	asm.INY(),
+	asm.CPY(0x0010, asm.IMM16),
+	asm.BNE("BRANCH_C17D6C"),
+
+	asm.TDC(),
+	asm.TAY(),
+	asm.LDA(0x2020, asm.ABS),
+	asm.INC(),
+	asm.STA(0x36, asm.DIR),
+	asm.LDA(0x0E, asm.DIR),
+	asm.AND(0x03, asm.IMM8),
+	asm.BNE("BRANCH_C17D8D"),
+
+	asm.LDA(0x7B82, asm.ABS),
+	asm.ADC(0x36, asm.DIR),
+	asm.STA(0x7B82, asm.ABS),
+
+	"BRANCH_C17D8D",
+	asm.LDA(0x7B82, asm.ABS),
+	asm.LSR(),
+	asm.LSR(),
+	asm.LSR(),
+	asm.LSR(),
+	asm.LSR(),
+	asm.CMP(0x36, asm.DIR),
+	asm.BNE("BRANCH_C17D9D"),
+
+	asm.TDC(),
+	asm.STA(0x7B82, asm.ABS),
+
+	"BRANCH_C17D9D",
+	asm.INC(),
+	asm.STA(0x36, asm.DIR),
+	asm.TDC(),
+	asm.TAX(),
+	asm.LDA(0x29, asm.IMM8),
+
+	"BRANCH_C17DA4",
+	asm.STA(0x5DDA, asm.ABS_X),
+	asm.INX(),
+	asm.INX(),
+	asm.DEC(0x36, asm.DIR),
+	asm.BNE("BRANCH_C17DA4"),
+
+	asm.LDA(0x7B82, asm.ABS),
+	asm.BPL("BRANCH_C17DBF"),
+
+	asm.LDA(0xF8, asm.IMM8),
+	asm.JSR(0x7DED, asm.ABS),
+	asm.LDA(0x7B82, asm.ABS),
+	asm.JSR(0x7DCE, asm.ABS),
+	asm.BRA("BRANCH_C17DCA"),
+
+	"BRANCH_C17DBF",
+	asm.JSR(0x7DCE, asm.ABS),
+	asm.LDA(0xF0, asm.IMM8),
+	asm.JSR(0x7DED, asm.ABS),
+
+	"BRANCH_C17DCA",
+	asm.INC(0x7B81, asm.ABS),
+	asm.RTS(),
+	)
+)