From 1a07d880145ce350cea5bf6373901adf45dba4bd Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Wed, 21 Feb 2007 01:12:50 +0000
Subject: Added support for RAM at 0x2000.  Fixed 1K display.

---
 source/zx81.c | 45 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 8 deletions(-)

(limited to 'source/zx81.c')

diff --git a/source/zx81.c b/source/zx81.c
index 81cfd55..4d1da51 100644
--- a/source/zx81.c
+++ b/source/zx81.c
@@ -31,6 +31,8 @@
 #include "zx81.h"
 #include "gui.h"
 
+#include "config.h"
+
 #include "zx81_bin.h"
 
 #ifndef TRUE
@@ -86,7 +88,6 @@ static Z80Byte		scr_mirror[7000];
 
 static Z80Word		RAMBOT=0;
 static Z80Word		RAMTOP=0;
-static Z80Word		RAMLEN=0;
 
 #define DFILE		0x400c
 
@@ -258,7 +259,7 @@ static Z80Byte FromASCII(char c)
 
 /* Open a tape file the passed address
 */
-static FILE *OpenTapeFile(Z80Word addr)
+static FILE *OpenTapeFile(Z80Word addr, int *cancelled)
 {
     static const char zx_chars[] = "\"#$:?()><=+-*/;,."
 				   "0123456789"
@@ -271,6 +272,7 @@ static FILE *OpenTapeFile(Z80Word addr)
     fp = NULL;
     f = 0;
     done = FALSE;
+    *cancelled = FALSE;
 
     while(f<(FILENAME_MAX-3) && !done)
     {
@@ -296,6 +298,10 @@ static FILE *OpenTapeFile(Z80Word addr)
 	{
 	    fp = fopen(fn,"rb");
 	}
+	else
+	{
+	    *cancelled = TRUE;
+	}
 
 	SK_DisplayKeyboard(BG_GFX_SUB);
     }
@@ -518,6 +524,12 @@ static void DrawScreen_TEXT(Z80 *z80)
 	    x++;
 	}
 
+	while (x<TXT_W)
+	{
+	    txt_screen[x+y*32]=0;
+	    x++;
+	}
+
 	y++;
     }
 }
@@ -749,16 +761,20 @@ static int EDCallback(Z80 *z80, Z80Val data)
 	    if (enable_filesystem && z80->DE.w<0x8000)
 	    {
 		FILE *fp;
+		int cancel;
 
-		if ((fp=OpenTapeFile(z80->DE.w)))
+		if ((fp=OpenTapeFile(z80->DE.w,&cancel)))
 		{
 		    LoadExternalTape(fp,z80);
 		    fclose(fp);
 		}
 		else
 		{
-		    GUI_Alert(FALSE,"Couldn't open tape");
-		    SK_DisplayKeyboard(BG_GFX_SUB);
+		    if (!cancel)
+		    {
+			GUI_Alert(FALSE,"Couldn't open tape");
+			SK_DisplayKeyboard(BG_GFX_SUB);
+		    }
 		}
 	    }
 	    else
@@ -847,8 +863,7 @@ void ZX81Init(uint16 *text_vram, uint16* bitmap_vram, Z80 *z80)
     /* Memory size (16K)
     */
     RAMBOT=0x4000;
-    RAMLEN=0x4000;
-    RAMTOP=RAMBOT+RAMLEN;
+    RAMTOP=RAMBOT+0x4000;
 
     for(f=RAMBOT;f<=RAMTOP;f++)
     	mem[f]=0;
@@ -873,7 +888,7 @@ void ZX81HandleKey(SoftKey key, int is_pressed)
     }
     else
     {
-    	/* TODO: Joysticks? */
+    	/* TODO: Joysticks?  Were there any common ones for the 81? */
     }
 }
 
@@ -1044,4 +1059,18 @@ void ZX81DisplayString(const char *p)
 }
 
 
+void ZX81Reconfigure(void)
+{
+    if (DS81_Config[DS81_STATIC_RAM_AT_0x2000])
+    {
+    	RAMBOT = 0x2000;
+    }
+    else
+    {
+    	RAMBOT = 0x4000;
+	memcpy(mem+ROMLEN,mem,ROMLEN);
+    }
+}
+
+
 /* END OF FILE */
-- 
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