work on peripherals and display

1 files changed, 35 insertions, 1 deletions

diff --git a/src/apple.c b/src/apple.c
index dae09cc..b9fd6ae 100644
--- a/src/apple.c
+++ b/src/apple.c
@@ -3,19 +3,53 @@
 void AppleOn(){
 	Memory = calloc(MEMORY_SIZE, sizeof(byte));
 	initInstructionTable();
+
+	// Load ROM
+	FILE *ROM = fopen ("rom.bin", "rb");
+	for (int i = 0; i < 256; i++) {
+		Memory[0xFF00+i] = fgetc(ROM);
+	}
 }
 
 void AppleReset(){
 	acc = 0; X = 0; Y = 0; P = 0; S = 0;
 	idata.cycles = 0; idata.length = 0; idata.add = 0; idata.value = 0;
+	PC = 0xFF00;
 	free(Memory);
 	Memory = calloc(MEMORY_SIZE, sizeof(byte));
 }
 
+byte ToAppleASCII(char x)
+{
+	if (x < 0x20 || x >= 0x60)
+		return -1;
+	if (x >= 0x40)
+		x -= 0x40;
+	return x;
+}
+
+byte ToRegularASCII(char x)
+{
+	if (x < 0x20)
+		x += 0x40;
+	return x;
+}
+
+
 byte getMemory(address x){
+	switch(x)
+	{
+		// I opted to make the kbd return successfully at all times for the sake of simplicity.
+		// This is not "accurate" behavior however.
+	case KBD:
+		return 0b10000000 | ToAppleASCII(UserInput());
+	case KBD_CR: case DSP:
+		return 0b10000000;
+	}
+
 	return Memory[x];
 }
 
 void setMemory(address x, byte y){
 	Memory[x] = y;
-}
\ No newline at end of file
+}