Added the B register, which is used for storing the

remainder during a DIV instruction.

I also added the TAB, and TBA instructions, for
transfering between the Accumulator, and the
B register.

1 files changed, 5 insertions, 1 deletions

diff --git a/opcode.h b/opcode.h
index a759ff8..a3775db 100644
--- a/opcode.h
+++ b/opcode.h
@@ -29,6 +29,7 @@
 #define ANX 0x24 /* bitwise ANd with X register. */
 #define AAX 0x25 /* bitwise And with Accumulator, and X register. */
 #define STT 0x28 /* STart Threads. */
+#define TAB 0x2C /* Transfer Accumulator to B.  */
 #define TSX 0x2E /* Transfer Stack pointer to X. */
 #define BPO 0x30 /* Branch if POsitive. */
 #define ORA 0x31 /* bitwise OR with Accumulator. */
@@ -37,6 +38,7 @@
 #define ORX 0x34 /* bitwise OR with X register. */
 #define OAX 0x35 /* bitwise Or with Accumulator, and X register. */
 #define SEI 0x38 /* SEt Interupt flag. */
+#define TBA 0x3C /* Transfer B to Accumulator.  */
 #define TXS 0x3E /* Transfer X to Stack pointer. */
 #define BNG 0x40 /* Branch if NeGative. */
 #define XOR 0x41 /* bitwise XOR with accumulator. */
@@ -108,7 +110,7 @@ uint8_t ibcount; /* Number of bytes taken up by instruction. */
 
 struct sux {
 	uint64_t ps; /* The processor status register. */
-	uint64_t a[8], y[8], x[8]; /* Registers A, X, and Y. */
+	uint64_t a[8], b[8], y[8], x[8]; /* Registers A, B, X, and Y. */
 	uint64_t pc[8]; /* Program counter. */
 	uint16_t sp[8]; /* Stack pointer. */
 	uint16_t stk_st[8]; /* Starting address of each threads stack. */
@@ -160,6 +162,7 @@ static const char *opname[0x100] = {
 	OPNAME(TSX),
 	[0x29] = "AND a",
 	[0x2B] = "AND zm",
+	OPNAME(TAB),
 	OPNAME(BPO),
 	[ORA] = "ORA #",
 	[ORY] = "ORY #",
@@ -170,6 +173,7 @@ static const char *opname[0x100] = {
 	OPNAME(TXS),
 	[0x39] = "ORA a",
 	[0x3B] = "ORA zm",
+	OPNAME(TBA),
 	OPNAME(BNG),
 	[XOR] = "XOR #",
 	[XRY] = "XRY #",