Loader

2 files changed, 42 insertions, 0 deletions

diff --git a/flags.asm b/flags.asm
index 786148e..343e8a6 100644
--- a/flags.asm
+++ b/flags.asm
@@ -283,6 +283,8 @@ lut_ccr:
 	;; 256-byte LUT for the Parity bit.
 	;; Keep this last so all storage references require only one
 	;; extension word.
+	;;
+	;; This table taken from another z80 emulator
 lut_parity:
 	dc.b	4,0,0,4,0,4,4,0,0,4,4,0,4,0,0,4
 	dc.b	0,4,4,0,4,0,0,4,4,0,0,4,0,4,4,0
diff --git a/loader.c b/loader.c
index b445474..0ad58d4 100644
--- a/loader.c
+++ b/loader.c
@@ -78,6 +78,46 @@ void init_load(void)
 
 }
 
+/* Loads an image file into the emulator, restoring state.
+ */
+void load_descriptor(char *folder, char *descriptor)
+{
+	
+}
+
+/* Load a page into the emulator's data structures.  Only stores a
+ * pointer to it; does not copy due to space constraints.
+ *
+ * ROM pages can (and should) be archived, but RAM pages must be
+ * unarchived.
+ */
+void load_page(int pageno, WORD *pptr)
+{
+	/* check the version */
+	if (*pptr != IMG_MAGIC)
+		ER_throw(ER_DATATYPE);
+
+	pptr++;
+
+	/* check the size */
+	if (*pptr != 0x4000)
+		ER_throw(ER_INVALID_BLOCK_STRUCTURE);
+
+	pptr++;
+
+	if (*pptr != (WORD)pageno)
+		ER_throw(ER_INVALID_LABEL);
+
+	pptr++;
+
+	if (*pptr != (WORD)c_TI83P)
+		ER_throw(ILLEGAL_TAG_ERROR);
+
+	pptr++;
+
+	pages[pageno] = pptr;
+}
+
 void unload(void)
 {
 	return;