From 8746d4da5b8612560df2502ee8f6ebdcafa54262 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Sun, 25 Mar 2007 19:06:31 +0000
Subject: Changed the monitor so it doesn't keep a history of PCs for the
 display, and added a seperate controllable disassembly display instead,

---
 source/monitor.c | 91 +++++++++++++++++++++++++++++++-------------------------
 1 file changed, 51 insertions(+), 40 deletions(-)

diff --git a/source/monitor.c b/source/monitor.c
index 6f0fa05..773f7c2 100644
--- a/source/monitor.c
+++ b/source/monitor.c
@@ -41,9 +41,18 @@ typedef enum
     DISPLAY_IY,
     DISPLAY_BC,
     DISPLAY_DE,
+    DISPLAY_PC,
     DISPLAY_TYPE_COUNT
 } MemDisplayType;
 
+typedef enum
+{
+    MODE_CPU_STATE,
+    MODE_HEX,
+    MODE_ASSEM,
+    MODE_TYPE_COUNT
+} DisplayModeType;
+
 
 /* ---------------------------------------- STATIC INTERFACES
 */
@@ -107,41 +116,24 @@ static void DisplayRunningState(int running)
 }
 
 
-static void DisplayCPU(Z80 *cpu, int stepped)
+static void DisplayCPU(Z80 *cpu)
 {
     static const char *flag_char = "SZ5H3PNC";
-    static Z80Word prev_pc[8];
     Z80Word tmp;
     int f;
     char flags[]="--------";
 
+    tmp = cpu->PC;
+
     /* Display disassembly
     */
-    for(f=0;f<8;f++)
+    for(f=0;f<17;f++)
     {
-    	tmp = prev_pc[f];
-
 	/* These may seem a bit convuluted, but there's no point being at home
 	   to Mr Undefined Behaviour
 	*/
-	TM_printf(1,f,"%4.4x:",tmp);
+	TM_printf(0,f,"%c%4.4x:",f==0 ? '>':' ',tmp);
 	TM_Put(7,f,Z80Disassemble(cpu,&tmp));
-
-	if (stepped && f)
-	{
-	    prev_pc[f-1] = prev_pc[f];
-	}
-    }
-
-    prev_pc[7] = tmp = cpu->PC;
-
-    TM_printf(0,8,">%4.4x:",tmp);
-    TM_Put(7,8,Z80Disassemble(cpu,&tmp));
-
-    for(f=0;f<8;f++)
-    {
-	TM_printf(1,9+f,"%4.4x:",tmp);
-	TM_Put(7,9+f,Z80Disassemble(cpu,&tmp));
     }
 
     /* Display process state
@@ -170,7 +162,7 @@ static void DisplayCPU(Z80 *cpu, int stepped)
 }
 
 
-static void DisplayMem(Z80 *cpu, MemDisplayType disp, Z80Word addr)
+static void DisplayMem(Z80 *cpu, MemDisplayType disp, Z80Word addr, int as_hex)
 {
     static const char *label[]=
     {
@@ -180,7 +172,8 @@ static void DisplayMem(Z80 *cpu, MemDisplayType disp, Z80Word addr)
 	"SP",
 	"IY",
 	"BC",
-	"DE"
+	"DE",
+	"PC"
     };
 
     int x,y;
@@ -211,19 +204,34 @@ static void DisplayMem(Z80 *cpu, MemDisplayType disp, Z80Word addr)
 	    addr = cpu->DE.w;
 	    break;
 
+	case DISPLAY_PC:
+	    addr = cpu->PC;
+	    break;
+
 	default:
 	    break;
     }
 
     TM_printf(0,0,"%s: %4.4x",label[disp],addr);
 
-    for(y=0;y<18;y++)
+    if (as_hex)
     {
-	TM_printf(0,y+2,"%4.4x:",addr);
+	for(y=0;y<20;y++)
+	{
+	    TM_printf(0,y+2,"%4.4x:",addr);
 
-    	for(x=0;x<8;x++)
+	    for(x=0;x<8;x++)
+	    {
+		TM_printf(6+x*3,y+2,"%2.2x",ZX81ReadDisassem(cpu,addr++));
+	    }
+	}
+    }
+    else
+    {
+	for(y=0;y<20;y++)
 	{
-	    TM_printf(6+x*3,y+2,"%2.2x",ZX81ReadDisassem(cpu,addr++));
+	    TM_printf(0,y+2,"%4.4x:",addr);
+	    TM_Put(7,y+2,Z80Disassemble(cpu,&addr));
 	}
     }
 }
@@ -237,8 +245,7 @@ void MachineCodeMonitor(Z80 *cpu)
     static MemDisplayType mem_display = DISPLAY_ADDR;
     int done = FALSE;
     int running = FALSE;
-    int cpu_display = TRUE;
-    int stepped = FALSE;
+    DisplayModeType display_mode = MODE_CPU_STATE;
     int key;
     SoftKey soft_key;
 
@@ -255,16 +262,21 @@ void MachineCodeMonitor(Z80 *cpu)
 	TM_Cls();
 	DisplayRunningState(running);
 
-	if (cpu_display)
+	switch(display_mode)
 	{
-	    DisplayCPU(cpu,stepped);
+	    case MODE_CPU_STATE:
+		DisplayCPU(cpu);
+		break;
+	    case MODE_HEX:
+		DisplayMem(cpu,mem_display,display_address,TRUE);
+		break;
+	    case MODE_ASSEM:
+		DisplayMem(cpu,mem_display,display_address,FALSE);
+		break;
+	    default:
+		TM_Put(0,0,"Oops!");
+	    	break;
 	}
-	else
-	{
-	    DisplayMem(cpu,mem_display,display_address);
-	}
-
-	stepped = FALSE;
 
 	do
 	{
@@ -298,7 +310,7 @@ void MachineCodeMonitor(Z80 *cpu)
 
 	if (key & KEY_SELECT)
 	{
-	    cpu_display = !cpu_display;
+	    display_mode = (display_mode+1) % MODE_TYPE_COUNT;
 	}
 
 	if (key & KEY_L)
@@ -333,7 +345,6 @@ void MachineCodeMonitor(Z80 *cpu)
 	if (running || (key & KEY_A))
 	{
 	    Z80SingleStep(cpu);
-	    stepped = TRUE;
 	}
     }
 
-- 
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