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Merge pull request #2563 from sidneycadot/fix-adc-sbc

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sim65: fixed ADC/SBC for the 65C02.
This commit is contained in:
Bob Andrews
2024-12-19 21:09:05 +01:00
committed by GitHub
parent a53524b9de fb6745573e
commit 028dc60386
1 changed files with 323 additions and 100 deletions
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423
src/sim65/6502.c
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@@ -37,10 +37,11 @@
/* Known bugs and limitations of the 65C02 simulation: /* Known bugs and limitations of the 65C02 simulation:
* support currently only on the level of 65SC02: * support currently only on the level of 65SC02:
BBRx, BBSx, RMBx, SMBx, WAI, and STP are unsupported BBRx, BBSx, RMBx, SMBx, WAI, and STP are unsupported
* BCD flag handling equals 6502 (unchecked if bug is simulated or wrong for
6502)
*/ */
#include <stdbool.h>
#include <stdint.h>
#include "memory.h" #include "memory.h"
#include "error.h" #include "error.h"
#include "6502.h" #include "6502.h"
@@ -662,40 +663,88 @@ static unsigned HaveIRQRequest;
TEST_SF (Regs.AC) TEST_SF (Regs.AC)
/* ADC */ /* ADC, binary mode (6502 and 65C02) */
#define ADC(v) \ /* TODO: once the Regs fields are properly sized, get rid of the
* "& 0xff" in the Regs.AC asignment.
*/
#define ADC_BINARY_MODE(v) \
do { \ do { \
unsigned old = Regs.AC; \ const uint8_t op = v; \
unsigned rhs = (v & 0xFF); \ const uint8_t OldAC = Regs.AC; \
if (GET_DF ()) { \ bool carry = GET_CF(); \
unsigned lo; \ Regs.AC = (OldAC + op + carry) & 0xff; \
int res; \ const bool NV = Regs.AC >= 0x80; \
lo = (old & 0x0F) + (rhs & 0x0F) + GET_CF (); \ carry = OldAC + op + carry >= 0x100; \
if (lo >= 0x0A) { \ SET_SF(NV); \
lo = ((lo + 0x06) & 0x0F) + 0x10; \ SET_OF(((OldAC >= 0x80) ^ NV) & ((op >= 0x80) ^ NV)); \
} \ SET_ZF(Regs.AC == 0); \
Regs.AC = (old & 0xF0) + (rhs & 0xF0) + lo; \ SET_CF(carry); \
res = (signed char)(old & 0xF0) + \ } while (0)
(signed char)(rhs & 0xF0) + \
(signed char)lo; \ /* ADC, decimal mode (6502 behavior) */
TEST_ZF (old + rhs + GET_CF ()); \ #define ADC_DECIMAL_MODE_6502(v) \
TEST_SF (Regs.AC); \ do { \
if (Regs.AC >= 0xA0) { \ const uint8_t op = v; \
Regs.AC += 0x60; \ const uint8_t OldAC = Regs.AC; \
} \ bool carry = GET_CF(); \
TEST_CF (Regs.AC); \ const uint8_t binary_result = OldAC + op + carry; \
SET_OF ((res < -128) || (res > 127)); \ uint8_t low_nibble = (OldAC & 15) + (op & 15) + carry; \
if (CPU == CPU_65C02) { \ if ((carry = low_nibble > 9)) \
++Cycles; \ low_nibble = (low_nibble - 10) & 15; \
} \ uint8_t high_nibble = (OldAC >> 4) + (op >> 4) + carry; \
const bool NV = (high_nibble & 8) != 0; \
if ((carry = high_nibble > 9)) \
high_nibble = (high_nibble - 10) & 15; \
Regs.AC = (high_nibble << 4) | low_nibble; \
SET_SF(NV); \
SET_OF(((OldAC >= 0x80) ^ NV) & ((op >= 0x80) ^ NV)); \
SET_ZF(binary_result == 0); \
SET_CF(carry); \
} while (0)
/* ADC, decimal mode (65C02 behavior) */
#define ADC_DECIMAL_MODE_65C02(v) \
do { \
const uint8_t op = v; \
const uint8_t OldAC = Regs.AC; \
const bool OldCF = GET_CF(); \
bool carry = OldCF; \
uint8_t low_nibble = (OldAC & 15) + (op & 15) + carry; \
if ((carry = low_nibble > 9)) \
low_nibble = (low_nibble - 10) & 15; \
uint8_t high_nibble = (OldAC >> 4) + (op >> 4) + carry; \
const bool PrematureSF = (high_nibble & 8) != 0; \
if ((carry = high_nibble > 9)) \
high_nibble = (high_nibble - 10) & 15; \
Regs.AC = (high_nibble << 4) | low_nibble; \
const bool NewZF = Regs.AC == 0; \
const bool NewSF = Regs.AC >= 0x80; \
const bool NewOF = ((OldAC >= 0x80) ^ PrematureSF) & \
((op >= 0x80) ^ PrematureSF); \
SET_SF(NewSF); \
SET_OF(NewOF); \
SET_ZF(NewZF); \
SET_CF(carry); \
++Cycles; \
} while (0)
/* ADC, 6502 version */
#define ADC_6502(v) \
do { \
if (GET_DF()) { \
ADC_DECIMAL_MODE_6502(v); \
} else { \ } else { \
Regs.AC += rhs + GET_CF (); \ ADC_BINARY_MODE(v); \
TEST_ZF (Regs.AC); \ } \
TEST_SF (Regs.AC); \ } while (0)
TEST_CF (Regs.AC); \
SET_OF (!((old ^ rhs) & 0x80) && \ /* ADC, 65C02 version */
((old ^ Regs.AC) & 0x80)); \ #define ADC_65C02(v) \
Regs.AC &= 0xFF; \ do { \
if (GET_DF()) { \
ADC_DECIMAL_MODE_65C02(v); \
} else { \
ADC_BINARY_MODE(v); \
} \ } \
} while (0) } while (0)
@@ -822,7 +871,7 @@ static unsigned HaveIRQRequest;
} \ } \
SET_CF (Val & 0x01); \ SET_CF (Val & 0x01); \
Val >>= 1; \ Val >>= 1; \
ADC (Val) ADC_6502 (Val)
/* BIT */ /* BIT */
#define BIT(Val) \ #define BIT(Val) \
@@ -879,7 +928,7 @@ static unsigned HaveIRQRequest;
/* ISC */ /* ISC */
#define ISC(Val) \ #define ISC(Val) \
Val = (Val + 1) & 0xFF; \ Val = (Val + 1) & 0xFF; \
SBC(Val) SBC_6502(Val)
/* ASR */ /* ASR */
#define ASR(Val) \ #define ASR(Val) \
@@ -977,33 +1026,88 @@ static unsigned HaveIRQRequest;
TEST_SF (Val); \ TEST_SF (Val); \
TEST_ZF (Val) TEST_ZF (Val)
/* SBC, binary mode (6502 and 65C02) */
/* SBC */ /* TODO: once the Regs fields are properly sized, get rid of the
#define SBC(v) \ * "& 0xff" in the Regs.AC asignment.
*/
#define SBC_BINARY_MODE(v) \
do { \ do { \
unsigned r_a = Regs.AC; \ const uint8_t op = v; \
unsigned src = (v) & 0xFF; \ const uint8_t OldAC = Regs.AC; \
unsigned ccc = (Regs.SR & CF) ^ CF; \ const bool borrow = !GET_CF(); \
unsigned tmp = r_a - src - ccc; \ Regs.AC = (OldAC - op - borrow) & 0xff; \
\ const bool NV = Regs.AC >= 0x80; \
SET_CF(tmp < 0x100); \ SET_SF(NV); \
TEST_SF(tmp); \ SET_OF(((OldAC >= 0x80) ^ NV) & ((op < 0x80) ^ NV)); \
TEST_ZF(tmp); \ SET_ZF(Regs.AC == 0); \
SET_OF((r_a ^ tmp) & (r_a ^ src) & 0x80); \ SET_CF(OldAC >= op + borrow); \
\ } while (0)
if (GET_DF ()) { \
unsigned low = (r_a & 0x0f) - (src & 0x0f) - ccc; \ /* SBC, decimal mode (6502 behavior) */
tmp = (r_a & 0xf0) - (src & 0xf0); \ #define SBC_DECIMAL_MODE_6502(v) \
if (low & 0x10) { \ do { \
low -= 6; \ const uint8_t op = v; \
tmp -= 0x10; \ const uint8_t OldAC = Regs.AC; \
} \ bool borrow = !GET_CF(); \
tmp = (low & 0xf) | tmp; \ const uint8_t binary_result = OldAC - op - borrow; \
if (tmp & 0x100) { \ const bool NV = binary_result >= 0x80; \
tmp -= 0x60; \ uint8_t low_nibble = (OldAC & 15) - (op & 15) - borrow; \
} \ if ((borrow = low_nibble >= 0x80)) \
low_nibble = (low_nibble + 10) & 15; \
uint8_t high_nibble = (OldAC >> 4) - (op >> 4) - borrow;\
if ((borrow = high_nibble >= 0x80)) \
high_nibble = (high_nibble + 10) & 15; \
Regs.AC = (high_nibble << 4) | low_nibble; \
SET_SF(NV); \
SET_OF(((OldAC >= 0x80) ^ NV) & ((op < 0x80) ^ NV)); \
SET_ZF(binary_result == 0); \
SET_CF(!borrow); \
} while (0)
/* SBC, decimal mode (65C02 behavior) */
#define SBC_DECIMAL_MODE_65C02(v) \
do { \
const uint8_t op = v; \
const uint8_t OldAC = Regs.AC; \
bool borrow = !GET_CF(); \
uint8_t low_nibble = (OldAC & 15) - (op & 15) - borrow; \
if ((borrow = low_nibble >= 0x80)) \
low_nibble += 10; \
const bool low_nibble_still_negative = \
(low_nibble >= 0x80); \
low_nibble &= 15; \
uint8_t high_nibble = (OldAC >> 4) - (op >> 4) - borrow;\
const bool PN = (high_nibble & 8) != 0; \
if ((borrow = high_nibble >= 0x80)) \
high_nibble += 10; \
high_nibble -= low_nibble_still_negative; \
high_nibble &= 15; \
Regs.AC = (high_nibble << 4) | low_nibble; \
SET_SF(Regs.AC >= 0x80); \
SET_OF(((OldAC >= 0x80) ^ PN) & ((op < 0x80) ^ PN)); \
SET_ZF(Regs.AC == 0x00); \
SET_CF(!borrow); \
++Cycles; \
} while (0)
/* SBC, 6502 version */
#define SBC_6502(v) \
do { \
if (GET_DF()) { \
SBC_DECIMAL_MODE_6502(v); \
} else { \
SBC_BINARY_MODE(v); \
} \
} while (0)
/* SBC, 65C02 version */
#define SBC_65C02(v) \
do { \
if (GET_DF()) { \
SBC_DECIMAL_MODE_65C02(v); \
} else { \
SBC_BINARY_MODE(v); \
} \ } \
Regs.AC = tmp & 0xFF; \
} while (0) } while (0)
@@ -1887,11 +1991,17 @@ static void OPC_6502_60 (void)
static void OPC_6502_61 (void) static void OPC_6502_61 (void)
/* Opcode $61: ADC (zp,x) */ /* Opcode $61: ADC (zp,x) */
{ {
ALU_OP (ZPXIND, ADC); ALU_OP (ZPXIND, ADC_6502);
} }
static void OPC_65C02_61 (void)
/* Opcode $61: ADC (zp,x) */
{
ALU_OP (ZPXIND, ADC_65C02);
}
static void OPC_6502_63 (void) static void OPC_6502_63 (void)
/* Opcode $63: RRA (zp,x) */ /* Opcode $63: RRA (zp,x) */
{ {
@@ -1911,7 +2021,15 @@ static void OPC_65SC02_64 (void)
static void OPC_6502_65 (void) static void OPC_6502_65 (void)
/* Opcode $65: ADC zp */ /* Opcode $65: ADC zp */
{ {
ALU_OP (ZP, ADC); ALU_OP (ZP, ADC_6502);
}
static void OPC_65C02_65 (void)
/* Opcode $65: ADC zp */
{
ALU_OP (ZP, ADC_65C02);
} }
@@ -1947,11 +2065,17 @@ static void OPC_6502_68 (void)
static void OPC_6502_69 (void) static void OPC_6502_69 (void)
/* Opcode $69: ADC #imm */ /* Opcode $69: ADC #imm */
{ {
ALU_OP_IMM (ADC); ALU_OP_IMM (ADC_6502);
} }
static void OPC_65C02_69 (void)
/* Opcode $69: ADC #imm */
{
ALU_OP_IMM (ADC_65C02);
}
static void OPC_6502_6A (void) static void OPC_6502_6A (void)
/* Opcode $6A: ROR a */ /* Opcode $6A: ROR a */
{ {
@@ -2010,7 +2134,15 @@ static void OPC_65C02_6C (void)
static void OPC_6502_6D (void) static void OPC_6502_6D (void)
/* Opcode $6D: ADC abs */ /* Opcode $6D: ADC abs */
{ {
ALU_OP (ABS, ADC); ALU_OP (ABS, ADC_6502);
}
static void OPC_65C02_6D (void)
/* Opcode $6D: ADC abs */
{
ALU_OP (ABS, ADC_65C02);
} }
@@ -2042,15 +2174,23 @@ static void OPC_6502_70 (void)
static void OPC_6502_71 (void) static void OPC_6502_71 (void)
/* Opcode $71: ADC (zp),y */ /* Opcode $71: ADC (zp),y */
{ {
ALU_OP (ZPINDY, ADC); ALU_OP (ZPINDY, ADC_6502);
} }
static void OPC_65SC02_72 (void) static void OPC_65C02_71 (void)
/* Opcode $71: ADC (zp),y */
{
ALU_OP (ZPINDY, ADC_65C02);
}
static void OPC_65C02_72 (void)
/* Opcode $72: ADC (zp) */ /* Opcode $72: ADC (zp) */
{ {
ALU_OP (ZPIND, ADC); ALU_OP (ZPIND, ADC_65C02);
} }
@@ -2074,11 +2214,17 @@ static void OPC_65SC02_74 (void)
static void OPC_6502_75 (void) static void OPC_6502_75 (void)
/* Opcode $75: ADC zp,x */ /* Opcode $75: ADC zp,x */
{ {
ALU_OP (ZPX, ADC); ALU_OP (ZPX, ADC_6502);
} }
static void OPC_65C02_75 (void)
/* Opcode $75: ADC zp,x */
{
ALU_OP (ZPX, ADC_65C02);
}
static void OPC_6502_76 (void) static void OPC_6502_76 (void)
/* Opcode $76: ROR zp,x */ /* Opcode $76: ROR zp,x */
{ {
@@ -2108,7 +2254,15 @@ static void OPC_6502_78 (void)
static void OPC_6502_79 (void) static void OPC_6502_79 (void)
/* Opcode $79: ADC abs,y */ /* Opcode $79: ADC abs,y */
{ {
ALU_OP (ABSY, ADC); ALU_OP (ABSY, ADC_6502);
}
static void OPC_65C02_79 (void)
/* Opcode $79: ADC abs,y */
{
ALU_OP (ABSY, ADC_65C02);
} }
@@ -2150,7 +2304,15 @@ static void OPC_65SC02_7C (void)
static void OPC_6502_7D (void) static void OPC_6502_7D (void)
/* Opcode $7D: ADC abs,x */ /* Opcode $7D: ADC abs,x */
{ {
ALU_OP (ABSX, ADC); ALU_OP (ABSX, ADC_6502);
}
static void OPC_65C02_7D (void)
/* Opcode $7D: ADC abs,x */
{
ALU_OP (ABSX, ADC_65C02);
} }
@@ -2992,11 +3154,17 @@ static void OPC_6502_E0 (void)
static void OPC_6502_E1 (void) static void OPC_6502_E1 (void)
/* Opcode $E1: SBC (zp,x) */ /* Opcode $E1: SBC (zp,x) */
{ {
ALU_OP (ZPXIND, SBC); ALU_OP (ZPXIND, SBC_6502);
} }
static void OPC_65C02_E1 (void)
/* Opcode $E1: SBC (zp,x) */
{
ALU_OP (ZPXIND, SBC_65C02);
}
static void OPC_6502_E3 (void) static void OPC_6502_E3 (void)
/* Opcode $E3: ISC (zp,x) */ /* Opcode $E3: ISC (zp,x) */
{ {
@@ -3016,7 +3184,15 @@ static void OPC_6502_E4 (void)
static void OPC_6502_E5 (void) static void OPC_6502_E5 (void)
/* Opcode $E5: SBC zp */ /* Opcode $E5: SBC zp */
{ {
ALU_OP (ZP, SBC); ALU_OP (ZP, SBC_6502);
}
static void OPC_65C02_E5 (void)
/* Opcode $E5: SBC zp */
{
ALU_OP (ZP, SBC_65C02);
} }
@@ -3047,17 +3223,23 @@ static void OPC_6502_E8 (void)
/* Aliases of opcode $EA */ /* Aliases of opcode $E9 */
#define OPC_6502_EB OPC_6502_E9 #define OPC_6502_EB OPC_6502_E9
static void OPC_6502_E9 (void) static void OPC_6502_E9 (void)
/* Opcode $E9: SBC #imm */ /* Opcode $E9: SBC #imm */
{ {
ALU_OP_IMM (SBC); ALU_OP_IMM (SBC_6502);
} }
static void OPC_65C02_E9 (void)
/* Opcode $E9: SBC #imm */
{
ALU_OP_IMM (SBC_65C02);
}
/* Aliases of opcode $EA */ /* Aliases of opcode $EA */
#define OPC_6502_1A OPC_6502_EA #define OPC_6502_1A OPC_6502_EA
#define OPC_6502_3A OPC_6502_EA #define OPC_6502_3A OPC_6502_EA
@@ -3123,7 +3305,15 @@ static void OPC_6502_EC (void)
static void OPC_6502_ED (void) static void OPC_6502_ED (void)
/* Opcode $ED: SBC abs */ /* Opcode $ED: SBC abs */
{ {
ALU_OP (ABS, SBC); ALU_OP (ABS, SBC_6502);
}
static void OPC_65C02_ED (void)
/* Opcode $ED: SBC abs */
{
ALU_OP (ABS, SBC_65C02);
} }
@@ -3154,15 +3344,24 @@ static void OPC_6502_F0 (void)
static void OPC_6502_F1 (void) static void OPC_6502_F1 (void)
/* Opcode $F1: SBC (zp),y */ /* Opcode $F1: SBC (zp),y */
{ {
ALU_OP (ZPINDY, SBC); ALU_OP (ZPINDY, SBC_6502);
} }
static void OPC_65SC02_F2 (void)
static void OPC_65C02_F1 (void)
/* Opcode $F1: SBC (zp),y */
{
ALU_OP (ZPINDY, SBC_65C02);
}
static void OPC_65C02_F2 (void)
/* Opcode $F2: SBC (zp) */ /* Opcode $F2: SBC (zp) */
{ {
ALU_OP (ZPIND, SBC); ALU_OP (ZPIND, SBC_65C02);
} }
@@ -3178,7 +3377,15 @@ static void OPC_6502_F3 (void)
static void OPC_6502_F5 (void) static void OPC_6502_F5 (void)
/* Opcode $F5: SBC zp,x */ /* Opcode $F5: SBC zp,x */
{ {
ALU_OP (ZPX, SBC); ALU_OP (ZPX, SBC_6502);
}
static void OPC_65C02_F5 (void)
/* Opcode $F5: SBC zp,x */
{
ALU_OP (ZPX, SBC_65C02);
} }
@@ -3212,7 +3419,15 @@ static void OPC_6502_F8 (void)
static void OPC_6502_F9 (void) static void OPC_6502_F9 (void)
/* Opcode $F9: SBC abs,y */ /* Opcode $F9: SBC abs,y */
{ {
ALU_OP (ABSY, SBC); ALU_OP (ABSY, SBC_6502);
}
static void OPC_65C02_F9 (void)
/* Opcode $F9: SBC abs,y */
{
ALU_OP (ABSY, SBC_65C02);
} }
@@ -3240,7 +3455,15 @@ static void OPC_6502_FB (void)
static void OPC_6502_FD (void) static void OPC_6502_FD (void)
/* Opcode $FD: SBC abs,x */ /* Opcode $FD: SBC abs,x */
{ {
ALU_OP (ABSX, SBC); ALU_OP (ABSX, SBC_6502);
}
static void OPC_65C02_FD (void)
/* Opcode $FD: SBC abs,x */
{
ALU_OP (ABSX, SBC_65C02);
} }
@@ -3890,35 +4113,35 @@ static const OPFunc OP65C02Table[256] = {
OPC_65C02_5E, OPC_65C02_5E,
OPC_Illegal, // $5F: BBR5 currently unsupported OPC_Illegal, // $5F: BBR5 currently unsupported
OPC_6502_60, OPC_6502_60,
OPC_6502_61, OPC_65C02_61,
OPC_65C02_NOP22, // $62 OPC_65C02_NOP22, // $62
OPC_65C02_NOP11, // $63 OPC_65C02_NOP11, // $63
OPC_65SC02_64, OPC_65SC02_64,
OPC_6502_65, OPC_65C02_65,
OPC_6502_66, OPC_6502_66,
OPC_Illegal, // $67: RMB6 currently unsupported OPC_Illegal, // $67: RMB6 currently unsupported
OPC_6502_68, OPC_6502_68,
OPC_6502_69, OPC_65C02_69,
OPC_6502_6A, OPC_6502_6A,
OPC_65C02_NOP11, // $6B OPC_65C02_NOP11, // $6B
OPC_65C02_6C, OPC_65C02_6C,
OPC_6502_6D, OPC_65C02_6D,
OPC_6502_6E, OPC_6502_6E,
OPC_Illegal, // $6F: BBR6 currently unsupported OPC_Illegal, // $6F: BBR6 currently unsupported
OPC_6502_70, OPC_6502_70,
OPC_6502_71, OPC_65C02_71,
OPC_65SC02_72, OPC_65C02_72,
OPC_65C02_NOP11, // $73 OPC_65C02_NOP11, // $73
OPC_65SC02_74, OPC_65SC02_74,
OPC_6502_75, OPC_65C02_75,
OPC_6502_76, OPC_6502_76,
OPC_Illegal, // $77: RMB7 currently unsupported OPC_Illegal, // $77: RMB7 currently unsupported
OPC_6502_78, OPC_6502_78,
OPC_6502_79, OPC_65C02_79,
OPC_65SC02_7A, OPC_65SC02_7A,
OPC_65C02_NOP11, // $7B OPC_65C02_NOP11, // $7B
OPC_65SC02_7C, OPC_65SC02_7C,
OPC_6502_7D, OPC_65C02_7D,
OPC_65C02_7E, OPC_65C02_7E,
OPC_Illegal, // $7F: BBR7 currently unsupported OPC_Illegal, // $7F: BBR7 currently unsupported
OPC_65SC02_80, OPC_65SC02_80,
@@ -4018,35 +4241,35 @@ static const OPFunc OP65C02Table[256] = {
OPC_6502_DE, OPC_6502_DE,
OPC_Illegal, // $DF: BBS5 currently unsupported OPC_Illegal, // $DF: BBS5 currently unsupported
OPC_6502_E0, OPC_6502_E0,
OPC_6502_E1, OPC_65C02_E1,
OPC_65C02_NOP22, // $E2 OPC_65C02_NOP22, // $E2
OPC_65C02_NOP11, // $E3 OPC_65C02_NOP11, // $E3
OPC_6502_E4, OPC_6502_E4,
OPC_6502_E5, OPC_65C02_E5,
OPC_6502_E6, OPC_6502_E6,
OPC_Illegal, // $E7: SMB6 currently unsupported OPC_Illegal, // $E7: SMB6 currently unsupported
OPC_6502_E8, OPC_6502_E8,
OPC_6502_E9, OPC_65C02_E9,
OPC_6502_EA, OPC_6502_EA,
OPC_65C02_NOP11, // $EB OPC_65C02_NOP11, // $EB
OPC_6502_EC, OPC_6502_EC,
OPC_6502_ED, OPC_65C02_ED,
OPC_6502_EE, OPC_6502_EE,
OPC_Illegal, // $EF: BBS6 currently unsupported OPC_Illegal, // $EF: BBS6 currently unsupported
OPC_6502_F0, OPC_6502_F0,
OPC_6502_F1, OPC_65C02_F1,
OPC_65SC02_F2, OPC_65C02_F2,
OPC_65C02_NOP11, // $F3 OPC_65C02_NOP11, // $F3
OPC_65C02_NOP24, // $F4 OPC_65C02_NOP24, // $F4
OPC_6502_F5, OPC_65C02_F5,
OPC_6502_F6, OPC_6502_F6,
OPC_Illegal, // $F7: SMB7 currently unsupported OPC_Illegal, // $F7: SMB7 currently unsupported
OPC_6502_F8, OPC_6502_F8,
OPC_6502_F9, OPC_65C02_F9,
OPC_65SC02_FA, OPC_65SC02_FA,
OPC_65C02_NOP11, // $FB OPC_65C02_NOP11, // $FB
OPC_65C02_NOP34, // $FC OPC_65C02_NOP34, // $FC
OPC_6502_FD, OPC_65C02_FD,
OPC_6502_FE, OPC_6502_FE,
OPC_Illegal, // $FF: BBS7 currently unsupported OPC_Illegal, // $FF: BBS7 currently unsupported
}; };