Enable disassembly toggle (ALT+D)

include/apple2.h

@@ -338,6 +338,11 @@ struct apple2 {
      * If paused is true, then execution of opcodes is suspended.
      */
     bool paused;
+
+    /*
+     * If this is true, then we will disassemble opcodes as we execute.
+     */
+    bool disasm;
 };
 
 extern apple2 *apple2_create(int, int);

include/apple2.reflect.h

@@ -6,6 +6,7 @@
 extern void apple2_reflect_init();
 
 extern REFLECT(apple2_reflect_cpu_info);
+extern REFLECT(apple2_reflect_disasm);
 extern REFLECT(apple2_reflect_machine_info);
 extern REFLECT(apple2_reflect_pause);
 

src/apple2.c

@@ -14,6 +14,7 @@
 #include "mos6502.dis.h"
 #include "objstore.h"
 #include "option.h"
+#include "vm_di.h"
 #include "vm_segment.h"
 
 /*
@@ -51,6 +52,9 @@ apple2_create(int width, int height)
     // Yes, please do execute opcodes to begin with
     mach->paused = false;
 
+    // Don't print opcodes by default
+    mach->disasm = false;
+
     // Forward set these to NULL in case we fail to build the machine
     // properly; that way, we won't try to free garbage data
     mach->rom = NULL;
@@ -334,10 +338,14 @@ apple2_free(apple2 *mach)
 void
 apple2_run_loop(apple2 *mach)
 {
+    FILE *out;
+
     if (option_flag(OPTION_DISASSEMBLE)) {
         return;
     }
 
+    out = (FILE *)vm_di_get(VM_OUTPUT);
+
     while (vm_screen_active(mach->screen)) {
         // If we're paused, then just re-loop until we're not
         if (mach->paused) {
@@ -345,13 +353,17 @@ apple2_run_loop(apple2 *mach)
             continue;
         }
 
-#if 0
-        mach->drive1->locked = true;
-        mach->drive2->locked = true;
-        mos6502_dis_opcode(mach->cpu, stdout, mach->cpu->PC);
-        mach->drive1->locked = false;
-        mach->drive2->locked = false;
-#endif
+        if (mach->disasm) {
+            if (mach->selected_drive) {
+                mach->selected_drive->locked = true;
+            }
+            
+            mos6502_dis_opcode(mach->cpu, out, mach->cpu->PC);
+
+            if (mach->selected_drive) {
+                mach->selected_drive->locked = false;
+            }
+        }
 
         mos6502_execute(mach->cpu);
 

src/apple2.reflect.c

@@ -15,6 +15,7 @@ apple2_reflect_init()
     ref->cpu_info = apple2_reflect_cpu_info;
     ref->machine_info = apple2_reflect_machine_info;
     ref->pause = apple2_reflect_pause;
+    ref->disasm = apple2_reflect_disasm;
 }
 
 REFLECT(apple2_reflect_cpu_info)
@@ -49,3 +50,9 @@ REFLECT(apple2_reflect_pause)
     apple2 *mach = (apple2 *)vm_di_get(VM_MACHINE);
     mach->paused = !mach->paused;
 }
+
+REFLECT(apple2_reflect_disasm)
+{
+    apple2 *mach = (apple2 *)vm_di_get(VM_MACHINE);
+    mach->disasm = !mach->disasm;
+}

src/vm_event.c

@@ -110,6 +110,10 @@ vm_event_keyboard_special(vm_event *ev, char ch)
             case 'p':
                 vm_reflect_pause(NULL);
                 break;
+
+            case 'd':
+                vm_reflect_disasm(NULL);
+                break;
         }
     }
 }