Tidy up makefile, fix VM memory bug

Makefile

@@ -8,16 +8,21 @@
 
 # Note: I understand this makefile is not as optimal as it could/should be
 
-CC       = gcc
-CFLAGS  ?= -Wall -Wpedantic -Wextra -std=c99 
-ROM      = rom.bin
+CC           = gcc
+CFLAGS      ?= -Wall -Wpedantic -Wextra -std=c99 
+DEBUG        = -g -ggdb
+ROM          = rom.bin
 TRACE_SUFFIX =
+TARGET       = hard
 
-all: hard
+all: $(TARGET)
 
-trace: CFLAGS += -g -ggdb -DTRACE -lreadline
+debug: CFLAGS += $(DEBUG)
+debug: $(TARGET)
+
+trace: CFLAGS += $(DEBUG) -DTRACE -lreadline
 trace: TRACE_SUFFIX = -trace
-trace: hard
+trace: $(TARGET)
 
 
 disass: CFLAGS += -DTRACE -lreadline
@@ -37,7 +42,7 @@ rom: rom.bin
 rom.bin: src/rom.asm src/zeropage.incbin
 	./ass.sh src/rom.asm src/zeropage.incbin
 
-hard: bin/main.o bin/vm.o
+$(TARGET): bin/main.o bin/vm.o
 	$(CC) $(CFLAGS) -o bin/$@$(TRACE_SUFFIX) $^
 
 clean:
@@ -45,5 +50,5 @@ clean:
 cleano:
 	rm -f bin/*.o
 
-.PHONY: all trace clean clean
+.PHONY: all debug trace clean cleano
 

src/vm.c

@@ -303,9 +303,10 @@ void vm_trace(struct CPU *cpu, uint8_t *mem, struct TRACE_T *tstate)
 				break;
 			case 'm':
 				if (sscanf(command+2,"%i %i", &mem_start,
-				                            &num_bytes) == EOF)
+				                          &num_bytes) == EOF) {
 					; // So far, sscanf always returns EOF
 					// (idk why). TODO: fix eventually
+				}
 				printf("Dumping %d bytes of memory starting "
 				       "at 0x%04x\n", num_bytes, mem_start);
 				print_vm_memory(mem, (uint16_t)mem_start,

src/vm.h

@@ -2,7 +2,7 @@
 
 #pragma once                    // WAAAAAY better than a dumb header guard ;)
 
-#define RAM_SIZE   16384        // highest it can be given 16-bit addresses
+#define RAM_SIZE   65536        // highest it can be given 16-bit addresses
 #define STACK_LIM  64