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cpu.py
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cpu.py
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from opcodes import *
from utils import *
from memory_control import *
def handle_opcode(code,A,B,C,D,E,H,L,F,SP,IME,MEMORY,pointer,keys):
HALT=0
match opcodes[code]:
case "NOP":
# print("NOP")
pointer += 1
cycle = 1
case "LDBCA16":
# print("LDBCA16")
B = readMem(MEMORY, pointer+2)
C = readMem(MEMORY, pointer+1)
pointer += 3
cycle = 3
case "LDHBCA":
# print("LDHBCA")
writeMem(MEMORY, joinHex(B, C), A)
pointer += 1
cycle = 2
case "INCBC":
# print("INCBC")
B,C = splitHex((joinHex(B,C) + 1) & 0xffff)
pointer += 1
cycle = 2
case "INCB":
# print("INCB")
# F[5] if overflow of BIT 3
F[5] = 0 if (B & 0x7) + 1 <= 0x7 else 1
B = (B + 1) & 0xFF
F[7] = int(B == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECB":
# print("DECB")
F[5] = int((B & 0x7) - 1 < 0)
B = (B - 1) & 0xFF
# print(B)
F[7] = int(B == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDB":
# print("LDB")
B = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "RLCA":
# Rotate left through carry
# print("RLCA")
A,F=RLC(A,F)
F[7] = 0
pointer += 1
cycle = 1
case "LDA16SP":
# print("LDA16SP")
a16=joinHex(readMem(MEMORY, pointer+2), readMem(MEMORY, pointer+1))
writeMem(MEMORY, a16, SP & 0xFF)
writeMem(MEMORY, a16+1, SP>>8 )
pointer += 3
cycle = 5
case "ADDHLBC":
# print("ADDHLBC")
F[5] = 1 if (joinHex(H,L) & 0x7FF) + \
(joinHex(B, C) & 0x7FF) > 0x7FF else 0
F[4] = int(joinHex(H,L) + joinHex(B, C) > 0xFFFF)
h, l = splitHex(joinHex(H,L) + joinHex(B, C))
F[6] = 0
H = h & 0xFF
L = l & 0xFF
pointer += 1
cycle = 2
case "LDABC":
# print("LDABC")
A = readMem(MEMORY, joinHex(B, C))
pointer += 1
cycle = 2
case "DECBC":
# print("DECBC")
B, C = splitHex((joinHex(B, C) - 1) & 0xFFFF)
pointer += 1
cycle = 2
case "INCC":
# Increment register C
# print("INCC")
F[5] = 0 if (C & 0x7) + 1 <= 0x7 else 1
C = (C + 1) & 0xFF
F[7] = int(C == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECC":
# print("DECC")
F[5] = int((C & 0x7) - 1 < 0)
C = (C - 1) & 0xFF
F[7] = int(C == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDC":
# print("LDC")
C = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "RRCA":
# Rotate right through carry
# print("RRCA")
A,F=RRC(A,F)
F[7] = 0
pointer += 1
cycle = 1
case "STOP":
# print("STOP0")
#exit()
pointer += 2
cycle = 0
case "LDDED16":
# print("LDDED16")
D = readMem(MEMORY, pointer+2)
E = readMem(MEMORY, pointer+1)
pointer += 3
cycle = 3
case "LDHDEA":
# print("LDHDEA")
writeMem(MEMORY, joinHex(D,E), A)
pointer += 1
cycle = 2
case "INCDE":
# print("INCDE")
D, E = splitHex((joinHex(D,E) + 1 ) & 0xFFFF)
pointer += 1
cycle = 2
case "INCD":
# print("INCD")
F[5] = 0 if (D & 0x7) + 1 <= 0x7 else 1
D = (D + 1) & 0xFF
F[7] = int(D == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECD":
# print("DECD")
F[5] = int((D & 0x7) - 1 < 0)
D = (D - 1) & 0xFF
F[7] = int(D == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDD":
# print("LDD")
D = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "RLA":
# print("RLA")
tmp = F[4]
F[4] = (A & 0x80) >> 7
A = (A << 1) & 0xFF
A = A | tmp
F[7] = 0
F[5:7] = [0, 0]
# disassembled_file.write(
# f"carry: {hex(F[4])}, prev carry: {tmp}, A: {A}\n")
pointer += 1
cycle = 1
case "JR":
# print("JR")
pointer += signed(readMem(MEMORY,
pointer+1)) + 2
cycle = 3
case "ADDHLDE":
# print("ADDHLDE")
F[5] = 1 if (joinHex(H,L) & 0x7FF) + \
(joinHex(D,E) & 0x7FF) > 0x7FF else 0
F[4] = int(joinHex(H,L) + joinHex(D,E) > 0xFFFF)
h, l = splitHex(joinHex(H,L) + joinHex(D,E))
F[6] = 0
# prevent overflow
H = h & 0xFF
L = l & 0xFF
pointer += 1
cycle = 2
case "LDADE":
# print("LDADE")
A = readMem(MEMORY, joinHex(D,E))
# input()
pointer += 1
cycle = 2
case "DECDE":
# print("DECDE")
D, E = splitHex((joinHex(D,E) - 1) & 0xFFFF)
pointer += 1
cycle = 2
case "INCE":
# print("INCE")
F[5] = 0 if (E & 0x7) + 1 <= 0x7 else 1
E = (E + 1) & 0xFF
F[7] = int(E == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECE":
# print("DECE")
F[5] = int((E & 0x7) - 1 < 0)
E = (E - 1) & 0xFF
F[7] = int(E == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDE":
# print("LDE")
E = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "RRA":
# print("RRA")
tmp = F[4]
F[4] = A & 0x01
A = (A >> 1) & 0xFF
A = A | (tmp << 7)
F[7] = 0
F[5:7] = [0, 0]
pointer += 1
cycle = 1
case "JRNZ":
# print("JRNZ")
pointer,cycle = (pointer+signed(readMem(MEMORY,pointer+1))+2,3) if F[7]==0 else (pointer+2,2)
case "LDHL16":
# print("LDHL16")
H = readMem(MEMORY, pointer+2)
L = readMem(MEMORY, pointer+1)
pointer += 3
cycle = 3
case "LDHL+A":
# print("LDHL+A")
writeMem(MEMORY, joinHex(H,L), A)
H, L = splitHex(joinHex(H,L) + 1)
pointer += 1
cycle = 2
case "INCHL":
# print("INCHL")
H, L = splitHex((joinHex(H,L) + 1) & 0xFFFF)
pointer += 1
cycle = 2
case "INCH":
# print("INCH")
F[5] = 0 if (H & 0x7) + 1 <= 0x7 else 1
H = (H + 1) & 0xFF
F[7] = int(H == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECH":
# print("DECH")
F[5] = int((H & 0x7) - 1 < 0)
H = (H - 1) & 0xFF
F[7] = int(H == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDHA8":
# print("LDHA8")
H = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "DAA":
# print("DAA")
# print(pointer)
# // note: assumes a is a uint8_t and wraps from 0xff to 0
# if (!n_flag) { // after an addition, adjust if (half-)carry occurred or if result is out of bounds
# if (c_flag || a > 0x99) { a += 0x60; c_flag = 1; }
# if (h_flag || (a & 0x0f) > 0x09) { a += 0x6; }
# } else { // after a subtraction, only adjust if (half-)carry occurred
# if (c_flag) { a -= 0x60; }
# if (h_flag) { a -= 0x6; }
# }
# // these flags are always updated
# z_flag = (a == 0); // the usual z flag
# h_flag = 0; // h flag is always cleared
if F[6] == 0:
if F[4] or A > 0x99:
A = (A + 0x60) & 0xFF
F[4] = 1
if F[5] or (A & 0x0F) > 0x09:
A = (A + 0x6) & 0xFF
else:
if F[4]:
A = (A - 0x60) & 0xFF
if F[5]:
A = (A - 0x6) & 0xFF
F[5] = 0
F[7] = int(A == 0)
pointer += 1
cycle = 1
# if A&0x0F >9 and (A&0xF0)>>4 >9:
# A = (A + 0x66) & 0xFF
# F[4] = 1
# else:
# if A&0x0F > 9:
# A = (A + 0x6)
# if ((A&0xF0)>>4) > 9:
# A = (A + 0x60) & 0xFF
# F[4] = 1
# F[7] = int(A==0)
# F[5] = 0
# pointer += 1
# cycle=1
case "JRZ":
# print("JRZ")
if F[7] == 1:
pointer += signed(readMem(MEMORY,
pointer+1)) + 2
cycle = 3
# print(hex(pointer))
# pointer += MEMORY[pointer+1] + 1
else:
pointer += 2
cycle = 2
case "ADDHLHL":
# print("ADDHLHL")
F[5] = 1 if (joinHex(H,L) & 0x7FF) + \
(joinHex(H,L) & 0x7FF) > 0x7FF else 0
F[4] = int(joinHex(H,L) + joinHex(H,L) > 0xFFFF)
H, L = splitHex(joinHex(H,L) + joinHex(H,L))
F[6] = 0
H = H & 0xFF
L = L & 0xFF
pointer += 1
cycle = 2
case "LDAHL+":
# print("LDAHL+")
# print(joinHex(H,L))
A = readMem(MEMORY, joinHex(H,L))
H, L = splitHex(joinHex(H,L) + 1)
pointer += 1
cycle = 2
case "DECHL":
# print("DECHL")
H, L = splitHex((joinHex(H,L) - 1) & 0xFFFF)
pointer += 1
cycle = 2
case "INCL":
# print("INCL")
F[5] = 0 if (L & 0x7) + 1 <= 0x7 else 1
L = (L + 1) & 0xFF
F[7] = int(L == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECL":
# print("DECL")
F[5] = int((L & 0x7) - 1 < 0)
L = (L - 1) & 0xFF
F[7] = int(L == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDL":
# print("LDL")
L = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "CPLM":
# print("CPL")
A = A ^ 0xFF
F[6] = 1
F[5] = 1
pointer += 1
cycle = 1
case "JRNCR8":
# print("JRNCR8")
if F[4] == 0:
pointer += signed(readMem(MEMORY,
pointer+1)) + 2
cycle = 3
else:
pointer += 2
cycle = 2
case "LDSP16":
# print("LDSP16")
SP = readMem(
MEMORY, pointer+2) << 8 | readMem(MEMORY, pointer+1)
pointer += 3
cycle = 3
case "LDHL-A":
# print("LDHL-A")
writeMem(MEMORY, joinHex(H,L), A)
H, L = splitHex(joinHex(H,L) - 1)
pointer += 1
cycle = 2
case "INCSP":
# print("INCSP")
SP = (SP + 1) & 0xFFFF
pointer += 1
cycle = 2
case "INCHHL":
# print("INCHL")
F[5] = 0 if (
readMem(MEMORY, joinHex(H,L)) & 0x7) + 1 <= 0x7 else 1
writeMem(MEMORY, joinHex(H,L), (readMem(MEMORY, joinHex(H,L)) + 1) & 0xFF)
F[7] = int(readMem(MEMORY, joinHex(H,L)) == 0)
F[6] = 0
pointer += 1
cycle = 3
case "DECHHL":
# print("DECHL")
writeMem(MEMORY, joinHex(H,L), (readMem(MEMORY, joinHex(H,L)) - 1) & 0xFF)
F[5] = int((readMem(MEMORY, joinHex(H,L))&0xf)==0xf)
F[7] = int(readMem(MEMORY, joinHex(H,L)) == 0)
F[6] = 1
pointer += 1
cycle = 3
case "LDHLA8":
# print("LDHLA8")
writeMem(MEMORY, joinHex(H,L), readMem(MEMORY, pointer+1))
pointer += 2
cycle = 3
case "SCF":
# print("SCF")
F[4] = 1
F[5] = 0
F[6] = 0
pointer += 1
cycle = 1
case "JRCR8":
# print("JRCR8")
if F[4] == 1:
pointer += signed(readMem(MEMORY,
pointer+1)) + 2
cycle = 3
else:
pointer += 2
cycle = 2
case "ADDHLSP":
# print("ADDHLSP")
F[5] = 1 if ((joinHex(H,L) & 0x7FF) + \
(SP & 0x7FF)) > 0x7FF else 0
H, L = splitHex(joinHex(H,L) + SP)
F[4] = int(joinHex(H,L) > 0xFFFF)
L &= 0xFF
H &= 0xFF
F[6] = 0
pointer += 1
cycle = 2
case "LDAHL-":
# print("LDAHL-")
A = readMem(MEMORY, joinHex(H,L))
hl = joinHex(H,L)
hl -= 1
H = (hl >> 8) & 0xFF
L = hl & 0xFF
pointer += 1
cycle = 2
case "DECSP":
# print("DECSP")
SP = (SP - 1) & 0xFFFF
pointer += 1
cycle = 2
case "INCA":
# Increment register A
# print("INCA")
F[5] = 0 if (A & 0x7) + 1 <= 0x7 else 1
A = (A + 1) & 0xFF
F[7] = int(A == 0)
F[6] = 0
pointer += 1
cycle = 1
case "DECA":
# print("DECA")
F[5] = int((A & 0x7) - 1 < 0)
A = (A - 1) & 0xFF
F[7] = int(A == 0)
F[6] = 1
pointer += 1
cycle = 1
case "LDA":
# print("LDA")
A = readMem(MEMORY, pointer+1)
pointer += 2
cycle = 2
case "CCF":
# print("CCF")
F[4] = int(F[4] == 0)
F[5] = 0
F[6] = 0
pointer += 1
cycle = 1
case "LDBB":
# print("LDBB")
B = B
pointer += 1
cycle = 1
case "LDBC":
# print("LDBC")
B = C
pointer += 1
cycle = 1
case "LDBD":
# print("LDBD")
B = D
pointer += 1
cycle = 1
case "LDBE":
# print("LDBE")
B = E
pointer += 1
cycle = 1
case "LDBH":
# print("LDBH")
B = H
pointer += 1
cycle = 1
case "LDBL":
# print("LDBL")
B = L
pointer += 1
cycle = 1
case "LDBHL":
# print("LDBHL")
B = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDBA":
# print("LDBA")
B = A
pointer += 1
cycle = 1
case "LDCB":
# print("LDCB")
C = B
pointer += 1
cycle = 1
case "LDCC":
# print("LDCC")
C = C
pointer += 1
cycle = 1
case "LDCD":
# print("LDCD")
C = D
pointer += 1
cycle = 1
case "LDCE":
# print("LDCE")
C = E
pointer += 1
cycle = 1
case "LDCH":
# print("LDCH")
C = H
pointer += 1
cycle = 1
case "LDCL":
# print("LDCL")
C = L
pointer += 1
cycle = 1
case "LDCHL":
# print("LDCHL")
C = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDCA":
# print("LDCA")
C = A
pointer += 1
cycle = 1
case "LDDB":
# print("LDDB")
D = B
pointer += 1
cycle = 1
case "LDDC":
# print("LDDC")
D = C
pointer += 1
cycle = 1
case "LDDD":
# print("LDDD")
D = D
pointer += 1
cycle = 1
case "LDDE":
# print("LDDE")
D = E
pointer += 1
cycle = 1
case "LDDH":
# print("LDDH")
D = H
pointer += 1
cycle = 1
case "LDDL":
# print("LDDL")
D = L
pointer += 1
cycle = 1
case "LDDHL":
# print("LDDHL")
D = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDDA":
D = A
pointer += 1
cycle = 1
case "LDEB":
# print("LDEB")
E = B
pointer += 1
cycle = 1
case "LDEC":
# print("LDEC")
E = C
pointer += 1
cycle = 1
case "LDED":
# print("LDED")
E = D
pointer += 1
cycle = 1
case "LDEE":
# print("LDEE")
E = E
pointer += 1
cycle = 1
case "LDEH":
# print("LDEH")
E = H
pointer += 1
cycle = 1
case "LDEL":
# print("LDEL")
E = L
pointer += 1
cycle = 1
case "LDEHL":
# print("LDEHL")
E = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDEA":
# print("LDEA")
E = A
pointer += 1
cycle = 1
case "LDHB":
# print("LDHB")
H = B
pointer += 1
cycle = 1
case "LDHC":
# print("LDHC")
H = C
pointer += 1
cycle = 1
case "LDHD":
# print("LDHD")
H = D
pointer += 1
cycle = 1
case "LDHE":
# print("LDHE")
H = E
pointer += 1
cycle = 1
case "LDHH":
# print("LDHH")
H = H
pointer += 1
cycle = 1
case "LDHL":
# print("LDHL")
H = L
pointer += 1
cycle = 1
case "LDHHL":
# print("LDHHL")
H = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDHA":
# print("LDHA")
H = A
# print(H)
pointer += 1
cycle = 1
case "LDLB":
# print("LDLB")
L = B
pointer += 1
cycle = 1
case "LDLC":
# print("LDLC")
L = C
pointer += 1
cycle = 1
case "LDLD":
# print("LDLD")
L = D
pointer += 1
cycle = 1
case "LDLE":
# print("LDLE")
L = E
pointer += 1
cycle = 1
case "LDLH":
# print("LDLH")
L = H
pointer += 1
cycle = 1
case "LDLL":
# print("LDLL")
L = L
pointer += 1
cycle = 1
case "LDLHL":
# print("LDLHL")
L = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDLA":
# load register A into L
# print("LDLA")
L = A
pointer += 1
cycle = 1
case "LDHLB":
# print("LDHLB")
writeMem(MEMORY, joinHex(H,L), B)
pointer += 1
cycle = 2
case "LDHLC":
# print("LDHLC")
writeMem(MEMORY, joinHex(H,L), C)
pointer += 1
cycle = 2
case "LDHLD":
# print("LDHLD")
writeMem(MEMORY, joinHex(H,L), D)
pointer += 1
cycle = 2
case "LDHLE":
# print("LDHLE")
writeMem(MEMORY, joinHex(H,L), E)
pointer += 1
cycle = 2
case "LDHLH":
# print("LDHLH")
writeMem(MEMORY, joinHex(H,L), H)
pointer += 1
cycle = 2
case "LDHLL":
# print("LDHLL")
writeMem(MEMORY, joinHex(H,L), L)
pointer += 1
cycle = 2
case "HALT":
# print("HALT")
if IME == 1:
HALT = 1
pointer += 1
cycle = 1
else:
cycle = 1
if readMem(MEMORY, 0xFFFF) & readMem(MEMORY, 0xFF0F):
A, B, C, D, E, H, L, F, SP, IME, MEMORY, pointer, cycle, HALT=handle_opcode(readMem(MEMORY, pointer),A,B,C,D,E,H,L,F,SP,IME,MEMORY,pointer+1,keys)
pointer += 1
case "LDHLA":
# Store value in A into memory address HL
# print("LDHLA")
writeMem(MEMORY, joinHex(H,L), A)
pointer += 1
cycle = 2
case "LDAB":
# print("LDAB")
A = B
pointer += 1
cycle = 1
case "LDAC":
# print("LDAC")
A = C
pointer += 1
cycle = 1
case "LDAD":
# print("LDAD")
A = D
pointer += 1
cycle = 1
case "LDAE":
# print("LDAE")
A = E
pointer += 1
cycle = 1
case "LDAH":
# print("LDAH")
A = H
pointer += 1
cycle = 1
case "LDAL":
# print("LDAL")
A = L
pointer += 1
cycle = 1
case "LDAHL":
# Load value into A from memory address HL
# print("LDAHL")
A = readMem(MEMORY, joinHex(H,L))
pointer += 1
cycle = 2
case "LDAA":
# print("LDAA")
A = A
pointer += 1
cycle = 1
case "ADDAB":
# print("ADDAB")
A,F=ADDAR8(A,B,F)
pointer += 1
cycle = 1
case "ADDAC":
# print("ADDAC")
A,F=ADDAR8(A,C,F)
pointer += 1
cycle = 1
case "ADDAD":
# print("ADDAD")
A,F=ADDAR8(A,D,F)
pointer += 1
cycle = 1
case "ADDAE":
# print("ADDAE")
A,F=ADDAR8(A,E,F)
pointer += 1
cycle = 1
case "ADDAH":
# print("ADDAH")
A,F=ADDAR8(A,H,F)
pointer += 1
cycle = 1
case "ADDAL":
# print("ADDAL")
A,F=ADDAR8(A,L,F)
pointer += 1
cycle = 1
case "ADDAHL":
# print("ADDAHL")
A,F=ADDAR8(A,readMem(MEMORY, joinHex(H,L)),F)
pointer += 1
cycle = 2
case "ADDAA":
# print("ADDAA")
A,F=ADDAR8(A,A,F)
pointer += 1
cycle = 1
case "ADCAB":
# print("ADCAB")
A,F=ADCAR8(A,B,F)
pointer += 1
cycle = 1
case "ADCAC":
# print("ADCAC")
A,F=ADCAR8(A,C,F)
pointer += 1
cycle = 1
case "ADCAD":
# print("ADCAD")
A,F=ADCAR8(A,D,F)
pointer += 1
cycle = 1
case "ADCAE":
# print("ADCAE")
A,F=ADCAR8(A,E,F)
pointer += 1
cycle = 1
case "ADCAH":
# print("ADCAH")
A,F=ADCAR8(A,H,F)
pointer += 1
cycle = 1
case "ADCAL":
# print("ADCAL")
A,F=ADCAR8(A,L,F)
pointer += 1
cycle = 1
case "ADCAHL":
# print("ADCAHL")
A,F=ADCAR8(A,readMem(MEMORY, joinHex(H,L)),F)
pointer += 1
cycle = 2
case "ADCAA":
# print("ADCAA")
A,F=ADCAR8(A,A,F)
pointer += 1
cycle = 1
case "SUBB":
# print("SUBB")
A,F=SUBAR8(A,B,F)
pointer += 1
cycle = 1
case "SUBC":
# print("SUBC")
A,F=SUBAR8(A,C,F)
pointer += 1
cycle = 1
case "SUBD":
# print("SUBD")
A,F=SUBAR8(A,D,F)
pointer += 1
cycle = 1
case "SUBE":
# print("SUBE")
A,F=SUBAR8(A,E,F)
pointer += 1
cycle = 1
case "SUBH":
# print("SUBH")
A,F=SUBAR8(A,H,F)
pointer += 1
cycle = 1
case "SUBL":
# print("SUBL")
A,F=SUBAR8(A,L,F)
pointer += 1
cycle = 1
case "SUBHL":
# print("SUBHL")
A,F=SUBAR8(A,readMem(MEMORY, joinHex(H,L)),F)
pointer += 1
cycle = 2
case "SUBA":
# print("SUBA")
A,F=SUBAR8(A,A,F)
pointer += 1
cycle = 1
case "SBCAB":
# print("SBCAB")
A,F=SBCAR8(A,B,F)
pointer += 1
cycle = 1
case "SBCAC":
# print("SBCAC")
A,F=SBCAR8(A,C,F)
pointer += 1
cycle = 1
case "SBCAD":
# print("SBCAD")
A,F=SBCAR8(A,D,F)
pointer += 1
cycle = 1
case "SBCAE":
# print("SBCAE")
A,F=SBCAR8(A,E,F)
pointer += 1
cycle = 1
case "SBCAH":
# print("SBCAH")
A,F=SBCAR8(A,H,F)
pointer += 1
cycle = 1
case "SBCAL":
# print("SBCAL")
A,F=SBCAR8(A,L,F)
pointer += 1
cycle = 1
case "SBCAHL":
# print("SBCAHL")
A,F=SBCAR8(A,readMem(MEMORY, joinHex(H,L)),F)
pointer += 1
cycle = 2
case "SBCAA":
# print("SBCAA")
A,F=SBCAR8(A,A,F)
pointer += 1
cycle = 1
case "ANDB":
# print("ANDB")
A = (A & B) & 0xFF
F[7] = int(A == 0)
F[4:7] = [0, 1, 0]
pointer += 1
cycle = 1
case "ANDC":
# print("ANDC")
A = A & C
F[7] = int(A == 0)
F[4:7] = [0, 1, 0]
pointer += 1
cycle = 1