diff --git a/bin/commands.cpp b/bin/commands.cpp
index 2dd3685..df61ec3 100644
--- a/bin/commands.cpp
+++ b/bin/commands.cpp
@@ -6,6 +6,9 @@
 #include <toolbox/os.h>
 #include <macos/errors.h>
 
+#include <cpu/defs.h>
+#include <cpu/CpuModule.h>
+
 #include "debugger.h"
 #include "debugger_internal.h"
 
@@ -66,6 +69,7 @@ namespace Debug {
 		struct tm *tm;
 		time_t t = OS::MacToUnix(value);
 
+		// localtime vs gmtime?
 		tm = ::localtime(&t);
 		strftime(buffer, sizeof(buffer), "%Y-%m-%d %I:%M:%S %p", tm);
 		puts(buffer);
@@ -76,30 +80,90 @@ namespace Debug {
 	{
 
 		puts("");
-		puts("          ##                                            ");
-		puts("        ##  ##  ####                                    ");
-		puts("        ##  ####  ##                                    ");
-		puts("      ##          ##                                    ");
-		puts("    ##    ##    ##                              ##      ");
-		puts("  ##            ##                              ####    ");
-		puts("##                ##                          ##  ##    ");
-		puts("  ########          ####                    ##    ##    ");
-		puts("          ##            ####################      ##    ");
-		puts("          ##            ##############          ##      ");
-		puts("            ####          ############        ##        ");
-		puts("            ######            ######          ##        ");
-		puts("            ######                          ##          ");
-		puts("            ####                            ##          ");
-		puts("            ##                              ##          ");
-		puts("            ##      ################        ##          ");
-		puts("            ##    ##                ##        ##        ");
-		puts("            ##    ##                  ##      ##        ");
-		puts("            ##    ##                    ##    ##        ");
-		puts("            ##    ##                    ##    ##        ");
-		puts("          ##    ##                    ##    ##          ");
-		puts("          ######                      ######            ");
+		puts("              ##                                            ");
+		puts("            ##  ##  ####                                    ");
+		puts("            ##  ####  ##                                    ");
+		puts("          ##          ##                                    ");
+		puts("        ##    ##    ##                              ##      ");
+		puts("      ##            ##                              ####    ");
+		puts("    ##                ##                          ##  ##    ");
+		puts("      ########          ####                    ##    ##    ");
+		puts("              ##            ####################      ##    ");
+		puts("              ##            ##############          ##      ");
+		puts("                ####          ############        ##        ");
+		puts("                ######            ######          ##        ");
+		puts("                ######                          ##          ");
+		puts("                ####                            ##          ");
+		puts("                ##                              ##          ");
+		puts("                ##      ################        ##          ");
+		puts("                ##    ##                ##        ##        ");
+		puts("                ##    ##                  ##      ##        ");
+		puts("                ##    ##                    ##    ##        ");
+		puts("                ##    ##                    ##    ##        ");
+		puts("              ##    ##                    ##    ##          ");
+		puts("              ######                      ######            ");
 		puts("");
 
 	}
 
+
+	void StackCrawl(void)
+	{
+		// stack crawl based on a6 frame pointers. (link/unlink)
+		// start with current a6.
+
+		uint32_t a6 = cpuGetAReg(6);
+
+		/*
+		 * a6:  previous a6
+		 * a6+4 return pc
+		 * .... parameters, locals, stack data
+		 * previous a6
+		 * return pc
+		 * ....
+		 */
+		// todo -- need a function to verify address is w/in stack range.
+
+
+		if (!a6) return;
+		printf("a6: %08x\n", a6);
+
+		while(a6)
+		{
+
+			uint32_t prevA6 = ReadLong(a6);
+			uint32_t pc = ReadLong(a6+4); // 
+
+			puts("------------");
+			printf("a6: %08x\n", prevA6);
+			printf("pc: %08x", pc);
+
+			// find the routine name...
+			for (const auto &kv : SymbolTable)
+			{
+				const auto &name = kv.first;
+				auto range = kv.second;
+
+				// range end may be 0
+				if ((pc == range.first) || (pc >= range.first && pc < range.second))
+				{
+					uint32_t offset = pc - range.first;
+					if (offset)
+						printf(" %s+$%x", name.c_str(), offset);
+					else
+						printf(" %s", name.c_str());
+					break;
+				}
+			}
+			puts("");
+
+			// hexdump contents between pc and previous....
+
+
+			a6 = prevA6;
+		}
+
+
+	}
+
 }
\ No newline at end of file
diff --git a/bin/debugger.cpp b/bin/debugger.cpp
index 594faf9..e267bb8 100644
--- a/bin/debugger.cpp
+++ b/bin/debugger.cpp
@@ -759,7 +759,7 @@ void PrintRegisters(const BackTraceInfo &i)
 		i.a[4], i.a[5], i.a[6], i.a[7]
 	);
 
-	printf("PC: %08X CSR: %04x %s\n", i.pc, i.csr, srbits);
+	printf("PC: %08x CSR: %04x %s\n", i.pc, i.csr, srbits);
 
 }
 
diff --git a/bin/debugger.h b/bin/debugger.h
index 03784ee..46b7bbf 100644
--- a/bin/debugger.h
+++ b/bin/debugger.h
@@ -147,6 +147,8 @@ void ReadWriteBreak(int32_t address);
 void PrintError(uint32_t value);
 void PrintDate(uint32_t value);
 
+void StackCrawl(void);
+
 void ApplyTemplate(int32_t address, const std::string &name);
 
 }
diff --git a/bin/lexer.rl b/bin/lexer.rl
index 80a06da..49e1f9a 100644
--- a/bin/lexer.rl
+++ b/bin/lexer.rl
@@ -150,6 +150,7 @@ namespace {
 			fgoto ident;
 		};
 
+
 	*|;
 
 	main := |*
@@ -268,6 +269,12 @@ namespace {
 			Parse(parser, tkDUMP, 0, command);
 		};
 
+
+		'sc'i | 'stackcrawl'i {
+			Parse(parser, tkSTACKCRAWL, 0, command);
+		};
+
+
 		'h'i | 'help'i {
 			Parse(parser, tkHELP, 0, command);
 		};
diff --git a/bin/parser.lemon b/bin/parser.lemon
index 3797f8b..762f0cb 100644
--- a/bin/parser.lemon
+++ b/bin/parser.lemon
@@ -162,6 +162,10 @@ stmt ::= LIST expr(a) EOL.
 	Debug::List(a.intValue);
 }
 
+stmt ::= STACKCRAWL EOL.
+{
+	Debug::StackCrawl();
+}
 
 stmt ::= expr(a) SEMI SEMIH EOL.
 {
@@ -205,12 +209,13 @@ stmt ::= expr(a) SEMI SEMIDATE EOL.
 	Debug::PrintDate(a.intValue);
 }
 
-
 stmt ::= expr(a) SEMI SEMIERROR EOL.
 {
 	Debug::PrintError(a.intValue);
 }
 
+
+
 stmt ::= expr(a) SEMI SEMIT IDENTIFIER(b) EOL.
 {
 	Debug::ApplyTemplate(a.intValue, *b.stringValue);