wip amiga registers

diff --git a/platforms/amiga/registers.h b/platforms/amiga/registers.h
new file mode 100644 (file)
index 0000000..ec7b825
--- /dev/null
+++ b/platforms/amiga/registers.h
@@ -0,0 +1,52 @@
+/**
+ * amiga custom chip registers
+ *
+ * transcribed from adcd 2.1 amigaguide. likely omits aa chipset registers, and gayle.
+ *
+ * just nine <nine@aphlor.org>
+ */
+
+#ifndef _AMIGA_REGISTERS_H
+#define _AMIGA_REGISTERS_H
+
+/**
+ * three discernable banks which cover all amiga systems.
+ *
+ * bfd000-bfdf00 for the even cia
+ * bfe001-bfef01 for the odd cia
+ * dff000-dfffff for custom chip registers
+ *
+ * we will concern ourselves with the custom chip registers here; the cia is for additional i/o ops
+ */
+
+#define CREG_BASE   0xdff000
+#define CREG_END    0xdfffff
+
+#define BLTDDAT     CREG_BASE + 0x000   // agnus, blitter destination early read address (dummy)
+#define DMACONR     CREG_BASE + 0x002   // agnus, paula dma control + blitter status read
+#define VPOSR       CREG_BASE + 0x004   // ecs agnus, read vertical msb + frame flop
+#define VHPOSR      CREG_BASE + 0x006   // agnus, vertical + horizonal position of beam
+#define DSKDATR     CREG_BASE + 0x008   // paula, disk data early read address (dummy)
+#define JOY0DAT     CREG_BASE + 0x00a   // denise, input port 0 data
+#define JOY1DAT     CREG_BASE + 0x00c   // denise, input port 1 data
+// clxdat
+// adkconr
+// pot0dat
+// pot1dat
+// potgor
+#define SERDATR     CREG_BASE + 0x018   // paula, serial port data and status, read
+// dskbytr
+// internar
+// intreqr
+// dskpth
+// dskptl
+// dsklen
+// refptr
+// vposw
+// vhposw
+// copcon
+#define SERDAT      CREG_BASE + 0x030   // paula, serial port data and stop bits, write
+#define SERPER      CREG_BASE + 0x032   // paula, serial port speed and control
+// @todo: the rest?!
+
+#endif