Zero-page modes, including wrapping quirk

diff --git a/src/CPU/addressing/zeropage b/src/CPU/addressing/zeropage
new file mode 100644 (file)
index 0000000..e2f3927
--- /dev/null
+++ b/src/CPU/addressing/zeropage
@@ -0,0 +1,2 @@
+mapper read PC+1
+mapper read M

diff --git a/src/CPU/addressing/zeropage,X b/src/CPU/addressing/zeropage,X
new file mode 100644 (file)
index 0000000..daf521d
--- /dev/null
+++ b/src/CPU/addressing/zeropage,X
@@ -0,0 +1,2 @@
+mapper read PC+1
+mapper read M + X mod 256

diff --git a/src/CPU/addressing/zeropage,Y b/src/CPU/addressing/zeropage,Y
new file mode 100644 (file)
index 0000000..5fb09d1
--- /dev/null
+++ b/src/CPU/addressing/zeropage,Y
@@ -0,0 +1,2 @@
+mapper read PC+1
+mapper read M + Y mod 256