--- M6502/M6502.xs	2007/08/02 11:08:10	87
+++ M6502/M6502.xs	2007/08/02 12:01:09	89
@@ -7,7 +7,7 @@
 #include "M6502.h"
 #include "config.h"
 
-M6502 *R;
+M6502 *R = NULL;
 int debug = 0;
 
 void update_C_R(void) {
@@ -54,6 +54,112 @@
 	LEAVE;
 }
 
+/** Debug6502() **********************************************/
+
+byte Debug6502(M6502 *R) {
+	dump_R;
+	return 1; // continue emulation
+}
+
+/** Rd6502()/Wr6502/Op6502() *********************************/
+/** These functions are called when access to RAM occurs.   **/
+/** They allow to control memory access. Op6502 is the same **/
+/** as Rd6502, but used to read *opcodes* only, when many   **/
+/** checks can be skipped to make it fast. It is only       **/
+/** required if there is a #define FAST_RDOP.               **/
+/************************************ TO BE WRITTEN BY USER **/
+
+byte mem(word Addr) {
+	byte byte;
+	int count;
+	debugf(("mem(%04x)", Addr));
+	dSP;
+	ENTER;
+	SAVETMPS;
+	PUSHMARK(SP);
+	XPUSHs( sv_2mortal( newSViv( Addr ) ) );
+	PUTBACK;
+	count = call_pv("M6502::_read", G_ARRAY | G_EVAL );
+	debugf(("got %d values", count));
+	SPAGAIN;
+	if (SvTRUE(ERRSV)) {
+		printf("ERROR: %s", SvPV_nolen( ERRSV ) );
+		exit(1);
+	}
+	if ( count != 1 ) {
+		printf("expect 1 return value, got %d", count);
+		exit(1);
+	}
+	SV *sv;
+	sv = POPs;
+	byte = SvIV(sv);
+	FREETMPS;
+	LEAVE;
+	debugf(("mem(%04x) = %02x", Addr, byte));
+	return byte;
+}
+
+byte Rd6502(register word Addr) {
+	byte Value;
+	Value = mem(Addr);
+//	Value = 0x42;
+	debugf(("Rd6502(%04x) = %02x", Addr, Value));
+	return Value;
+}
+
+void Wr6502(register word Addr,register byte Value) {
+	debugf(("Wr6502(%04x,%02x)", Addr, Value));
+	dSP;
+	ENTER;
+	SAVETMPS;
+	PUSHMARK(SP);
+	XPUSHs( sv_2mortal( newSViv( Addr ) ) );
+	XPUSHs( sv_2mortal( newSViv( Value ) ) );
+	PUTBACK;
+	call_pv("M6502::_write", G_DISCARD );
+	FREETMPS;
+	LEAVE;
+}
+
+byte Op6502(register word Addr) {
+	byte Op;
+	Op = mem(Addr);
+	debugf(("Op6502(%04x,%02x) PC:%04x", Addr, Op, R->PC.W));
+	return Op;
+}
+
+/** Loop6502() ***********************************************/
+/** 6502 emulation calls this function periodically to      **/
+/** check if the system hardware requires any interrupts.   **/
+/** This function must return one of following values:      **/
+/** INT_NONE, INT_IRQ, INT_NMI, or INT_QUIT to exit the     **/
+/** emulation loop.                                         **/
+/************************************ TO BE WRITTEN BY USER **/
+
+int hw_int = INT_NONE;
+
+byte Loop6502(register M6502 *R) {
+	debugf(("Loop6502"));
+	dump_R;
+	return hw_int;
+}
+
+/** Patch6502() **********************************************/
+/** Emulation calls this function when it encounters an     **/
+/** unknown opcode. This can be used to patch the code to   **/
+/** emulate BIOS calls, such as disk and tape access. The   **/
+/** function should return 1 if the exception was handled,  **/
+/** or 0 if the opcode was truly illegal.                   **/
+/************************************ TO BE WRITTEN BY USER **/
+byte Patch6502(register byte Op,register M6502 *R) {
+	debugf(("Patch6502(%02x)", Op));
+	dump_R;
+	hw_int = INT_QUIT;
+	return 0;
+}
+
+/*************************************************************/
+
 int
 reset (void) {
 	debugf(("M6502::reset called"));
@@ -61,7 +167,7 @@
 		debugf(("allocating space for R"));
 		R = malloc(sizeof(M6502));
 		if (!R) {
-			PerlIO_stderrf("can't alloc %d bytes for M6502", sizeof(M6502));
+			PerlIO_stdoutf("can't alloc %d bytes for M6502", sizeof(M6502));
 			exit(1);
 		}
 	}
@@ -72,6 +178,17 @@
 	return 1;
 }
 
+void exec(int cycles) {
+	debugf(("exec for %d cycles", cycles));
+
+	if (!R) reset();
+
+	update_C_R();
+	Exec6502(R, cycles);
+	update_perl_R();
+	debugf(("end of %d cycles CPU run\n", cycles));
+}
+
 int set_debug(int state) {
 	debug = state;
 	return debug;