From 69e9fcc59363e3be82d4783bf5fc46daf40bfa15 Mon Sep 17 00:00:00 2001
From: Astrid Smith
Date: Sat, 26 Jun 2010 21:33:19 -0700
Subject: Added bank-swapping routines (incomplete: doesn't implement memory
 map mode 1)

---
 bankswap.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 bankswap.c

(limited to 'bankswap.c')

diff --git a/bankswap.c b/bankswap.c
new file mode 100644
index 0000000..db4931c
--- /dev/null
+++ b/bankswap.c
@@ -0,0 +1,27 @@
+/* Memory bank swapping driver for 680 project.
+ *
+ * Copyright 2010, Astrid Smith
+ * GPL
+ */
+
+#include "asm_vars.h"
+
+void* pages[256];
+
+/* Address 0000 is always bound to ROM page 0. */
+
+/* Process orders to swap bank A (port 06, 0x4000). */
+void bankswap_4000_write(char data)
+{
+	mem_page_1 = pages[data];
+	mem_page_loc_1 = data;
+	return;
+}
+
+/* Process orders to swap bank B (port 07, 0x8000). */
+void bankswap_b_write(char data)
+{
+	mem_page_2 = pages[data];
+	mem_page_loc_2 = data;
+	return;
+}
-- 
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