--- M6502/M6502.pm	2007/07/30 21:53:04	35
+++ M6502/M6502.pm	2007/07/31 08:41:06	40
@@ -6,7 +6,7 @@
 use Data::Dump qw/dump/;
 use Carp qw/confess/;
 use Exporter 'import';
-our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod';
+our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $run_for';
 
 =head1 NAME
 
@@ -23,9 +23,12 @@
 # program counter
 our $PC = 0xbeef;
 # CPU registars
-our ( $A, $P, $X, $Y, $S ) = (0x42) x 5;
+our ( $A, $P, $X, $Y, $S ) = (0) x 5;
 # Set IPeriod to number of CPU cycles between calls to Loop6502
 our $IPeriod = 1;
+# Exec6502 cycles
+our $run_for = 1;
+$run_for = 0x42;
 
 =head1 init
 
@@ -116,4 +119,28 @@
 	confess "no from address";
 }
 
+=head2 push_R
+
+called by C<perl.c> to push changes in registars back to perl variables
+
+=cut
+
+sub push_R {
+	warn "push_R(",dump(@_),")\n";
+	my ( $a, $p, $x, $y, $s, $pc ) = @_;
+	$PC = $pc;
+	$S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
+	dump_R();
+}
+
+=head2 dump_R
+
+helper function which dumps registers
+
+=cut
+
+sub dump_R {
+	warn sprintf("PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S);
+}
+
 1;