From 37236919c76ed4b5a8a7c98950257e3626e268c4 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Mon, 9 Aug 2021 18:50:11 +0000
Subject: Changed initial directory and added joystick emulation.

---
 source/spec.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 78 insertions(+), 2 deletions(-)

(limited to 'source/spec.c')

diff --git a/source/spec.c b/source/spec.c
index 1a5eba2..0dc753f 100644
--- a/source/spec.c
+++ b/source/spec.c
@@ -134,9 +134,16 @@ static struct
 };
 
 
-/* The keyboard
+/* The keyboard and joystick
 */
 static Z80Byte		matrix[8];
+static Z80Byte          joystick;
+
+#define JOY_FIRE        0x10
+#define JOY_UP          0x08
+#define JOY_DOWN        0x04
+#define JOY_LEFT        0x02
+#define JOY_RIGHT       0x01
 
 static struct
 {
@@ -424,7 +431,66 @@ void SPECHandleKey(SoftKey key, int is_pressed)
     }
     else
     {
-    	/* TODO: Joysticks?  */
+    	switch(key)
+        {
+            case SK_PAD_UP:
+                if (is_pressed)
+                {
+                    joystick = joystick | JOY_UP;
+                }
+                else
+                {
+                    joystick = joystick & ~JOY_UP;
+                }
+                break;
+
+            case SK_PAD_DOWN:
+                if (is_pressed)
+                {
+                    joystick = joystick | JOY_DOWN;
+                }
+                else
+                {
+                    joystick = joystick & ~JOY_DOWN;
+                }
+                break;
+
+            case SK_PAD_LEFT:
+                if (is_pressed)
+                {
+                    joystick = joystick | JOY_LEFT;
+                }
+                else
+                {
+                    joystick = joystick & ~JOY_LEFT;
+                }
+                break;
+
+            case SK_PAD_RIGHT:
+                if (is_pressed)
+                {
+                    joystick = joystick | JOY_RIGHT;
+                }
+                else
+                {
+                    joystick = joystick & ~JOY_RIGHT;
+                }
+                break;
+
+            case SK_PAD_A:
+                if (is_pressed)
+                {
+                    joystick = joystick | JOY_FIRE;
+                }
+                else
+                {
+                    joystick = joystick & ~JOY_FIRE;
+                }
+                break;
+
+            default:
+                break;
+        }
     }
 }
 
@@ -448,9 +514,19 @@ Z80Byte SPECReadPort(Z80 *z80, Z80Word port)
     switch(lo)
     {
 	case 0x1f:	/* Kempston joystick */
+            b = joystick;
 	    break;
 
 	case 0x7f:	/* Fuller joystick */
+            b = ~joystick;
+            if (b & JOY_FIRE)
+            {
+                b |= 0x80;
+            }
+            else
+            {
+                b &= 0x7f;
+            }
 	    break;
 
 	case 0xfb:	/* ZX Printer */
-- 
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