From 622d6aca9c3b821969def3fcb06a2207c2d7a697 Mon Sep 17 00:00:00 2001
From: Daniel Loffgren <daniel@loffgren.org>
Date: Mon, 14 Sep 2015 00:09:42 +0000
Subject: [PATCH] Added code to load and mirror the ROM

git-svn-id: svn+ssh://svn.phoenixbox.net/svn/apple1/trunk@4 64f78de7-aa59-e511-a0e8-0002a5492df0
---
 apple1/main.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/apple1/main.c b/apple1/main.c
index da4acf9..4557d1d 100644
--- a/apple1/main.c
+++ b/apple1/main.c
@@ -8,11 +8,40 @@
 
 #include <v6502/cpu.h>
 #include <v6502/mem.h>
+#include <stdio.h>
+
+#define ROM_START	0xF000
+#define ROM_SIZE	0x00FF
 
 void fault(void *ctx, const char *e) {
 	(*(int *)ctx)++;
 }
 
+static void loadRomFile(v6502_memory *mem, const char *fname, uint16_t address) {
+	FILE *f = fopen(fname, "r");
+	
+	if (!f) {
+		fprintf(stderr, "Could not read from \"%s\"!\n", fname);
+		return;
+	}
+	
+	uint8_t byte;
+	uint16_t offset = 0;
+	
+	while (fread(&byte, 1, 1, f)) {
+		mem->bytes[address + (offset++)] = byte;
+	}
+	
+	printf("Loaded %u bytes at 0x%x.\n", offset, address);
+	
+	fclose(f);
+}
+
+uint8_t romMirrorCallback(struct _v6502_memory *memory, uint16_t offset, int trap, void *context) {
+	return memory->bytes[offset % ROM_SIZE];
+}
+
+
 int main(int argc, const char * argv[])
 {
 	int faulted = 0;
@@ -22,6 +51,14 @@ int main(int argc, const char * argv[])
 	cpu->fault_callback = fault;
 	cpu->fault_context = &faulted;
 	
+	// Load Woz Monitor
+	loadRomFile(cpu->memory, "apple1.rom", ROM_START);
+	for (uint16_t start = ROM_START + ROM_SIZE + 1;
+		 start < v6502_memoryStartCeiling && start > ROM_START;
+		 start += ROM_SIZE + 1) {
+		v6502_map(cpu->memory, start, ROM_SIZE, romMirrorCallback, NULL, NULL);
+	}
+	
 	v6502_reset(cpu);
 	
 	while (!faulted) {