res

Operands

res bit,r | res bit,(rr) | res bit,(ii+dd),r | res bit,(ii+dd)

Resets bit 0 of B.

Variants

Every form of res the assembler accepts. The cycles column counts clock cycles, written as taken/not taken for the conditional forms.

Instruction	Description	Flags	Bytes	Cycles
res 0,b	Resets bit 0 of B.	—	2	8
res 0,c	Resets bit 0 of C.	—	2	8
res 0,d	Resets bit 0 of D.	—	2	8
res 0,e	Resets bit 0 of E.	—	2	8
res 0,h	Resets bit 0 of H.	—	2	8
res 0,l	Resets bit 0 of L.	—	2	8
res 0,(hl)	Resets bit 0 of (HL).	—	2	15
res 0,a	Resets bit 0 of A.	—	2	8
res 1,b	Resets bit 1 of B.	—	2	8
res 1,c	Resets bit 1 of C.	—	2	8
res 1,d	Resets bit 1 of D.	—	2	8
res 1,e	Resets bit 1 of E.	—	2	8
res 1,h	Resets bit 1 of H.	—	2	8
res 1,l	Resets bit 1 of L.	—	2	8
res 1,(hl)	Resets bit 1 of (HL).	—	2	15
res 1,a	Resets bit 1 of A.	—	2	8
res 2,b	Resets bit 2 of B.	—	2	8
res 2,c	Resets bit 2 of C.	—	2	8
res 2,d	Resets bit 2 of D.	—	2	8
res 2,e	Resets bit 2 of E.	—	2	8
res 2,h	Resets bit 2 of H.	—	2	8
res 2,l	Resets bit 2 of L.	—	2	8
res 2,(hl)	Resets bit 2 of (HL).	—	2	15
res 2,a	Resets bit 2 of A.	—	2	8
res 3,b	Resets bit 3 of B.	—	2	8
res 3,c	Resets bit 3 of C.	—	2	8
res 3,d	Resets bit 3 of D.	—	2	8
res 3,e	Resets bit 3 of E.	—	2	8
res 3,h	Resets bit 3 of H.	—	2	8
res 3,l	Resets bit 3 of L.	—	2	8
res 3,(hl)	Resets bit 3 of (HL).	—	2	15
res 3,a	Resets bit 3 of A.	—	2	8
res 4,b	Resets bit 4 of B.	—	2	8
res 4,c	Resets bit 4 of C.	—	2	8
res 4,d	Resets bit 4 of D.	—	2	8
res 4,e	Resets bit 4 of E.	—	2	8
res 4,h	Resets bit 4 of H.	—	2	8
res 4,l	Resets bit 4 of L.	—	2	8
res 4,(hl)	Resets bit 4 of (HL).	—	2	15
res 4,a	Resets bit 4 of A.	—	2	8
res 5,b	Resets bit 5 of B.	—	2	8
res 5,c	Resets bit 5 of C.	—	2	8
res 5,d	Resets bit 5 of D.	—	2	8
res 5,e	Resets bit 5 of E.	—	2	8
res 5,h	Resets bit 5 of H.	—	2	8
res 5,l	Resets bit 5 of L.	—	2	8
res 5,(hl)	Resets bit 5 of (HL).	—	2	15
res 5,a	Resets bit 5 of A.	—	2	8
res 6,b	Resets bit 6 of B.	—	2	8
res 6,c	Resets bit 6 of C.	—	2	8
res 6,d	Resets bit 6 of D.	—	2	8
res 6,e	Resets bit 6 of E.	—	2	8
res 6,h	Resets bit 6 of H.	—	2	8
res 6,l	Resets bit 6 of L.	—	2	8
res 6,(hl)	Resets bit 6 of (HL).	—	2	15
res 6,a	Resets bit 6 of A.	—	2	8
res 7,b	Resets bit 7 of B.	—	2	8
res 7,c	Resets bit 7 of C.	—	2	8
res 7,d	Resets bit 7 of D.	—	2	8
res 7,e	Resets bit 7 of E.	—	2	8
res 7,h	Resets bit 7 of H.	—	2	8
res 7,l	Resets bit 7 of L.	—	2	8
res 7,(hl)	Resets bit 7 of (HL).	—	2	15
res 7,a	Resets bit 7 of A.	—	2	8
res 0,(ix+dd),b undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 0,(ix+dd),c undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 0,(ix+dd),d undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 0,(ix+dd),e undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 0,(ix+dd),h undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 0,(ix+dd),l undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 0,(ix+dd)	Resets bit 0 of the memory location pointed to by IX plus `dd`.	—	4	23
res 0,(ix+dd),a undocumented	Resets bit 0 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 1,(ix+dd),b undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 1,(ix+dd),c undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 1,(ix+dd),d undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 1,(ix+dd),e undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 1,(ix+dd),h undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 1,(ix+dd),l undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 1,(ix+dd)	Resets bit 1 of the memory location pointed to by IX plus `dd`.	—	4	23
res 1,(ix+dd),a undocumented	Resets bit 1 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 2,(ix+dd),b undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 2,(ix+dd),c undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 2,(ix+dd),d undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 2,(ix+dd),e undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 2,(ix+dd),h undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 2,(ix+dd),l undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 2,(ix+dd)	Resets bit 2 of the memory location pointed to by IX plus `dd`.	—	4	23
res 2,(ix+dd),a undocumented	Resets bit 2 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 3,(ix+dd),b undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 3,(ix+dd),c undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 3,(ix+dd),d undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 3,(ix+dd),e undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 3,(ix+dd),h undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 3,(ix+dd),l undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 3,(ix+dd)	Resets bit 3 of the memory location pointed to by IX plus `dd`.	—	4	23
res 3,(ix+dd),a undocumented	Resets bit 3 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 4,(ix+dd),b undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 4,(ix+dd),c undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 4,(ix+dd),d undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 4,(ix+dd),e undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 4,(ix+dd),h undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 4,(ix+dd),l undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 4,(ix+dd)	Resets bit 4 of the memory location pointed to by IX plus `dd`.	—	4	23
res 4,(ix+dd),a undocumented	Resets bit 4 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 5,(ix+dd),b undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 5,(ix+dd),c undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 5,(ix+dd),d undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 5,(ix+dd),e undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 5,(ix+dd),h undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 5,(ix+dd),l undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 5,(ix+dd)	Resets bit 5 of the memory location pointed to by IX plus `dd`.	—	4	23
res 5,(ix+dd),a undocumented	Resets bit 5 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 6,(ix+dd),b undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 6,(ix+dd),c undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 6,(ix+dd),d undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 6,(ix+dd),e undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 6,(ix+dd),h undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 6,(ix+dd),l undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 6,(ix+dd)	Resets bit 6 of the memory location pointed to by IX plus `dd`.	—	4	23
res 6,(ix+dd),a undocumented	Resets bit 6 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 7,(ix+dd),b undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in B.	—	4	23
res 7,(ix+dd),c undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in C.	—	4	23
res 7,(ix+dd),d undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in D.	—	4	23
res 7,(ix+dd),e undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in E.	—	4	23
res 7,(ix+dd),h undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in H.	—	4	23
res 7,(ix+dd),l undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in L.	—	4	23
res 7,(ix+dd)	Resets bit 7 of the memory location pointed to by IX plus `dd`.	—	4	23
res 7,(ix+dd),a undocumented	Resets bit 7 of the memory location pointed to by IX plus `dd`. The result is then stored in A.	—	4	23
res 0,(iy+dd),b undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 0,(iy+dd),c undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 0,(iy+dd),d undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 0,(iy+dd),e undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 0,(iy+dd),h undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 0,(iy+dd),l undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 0,(iy+dd)	Resets bit 0 of the memory location pointed to by IY plus `dd`.	—	4	23
res 0,(iy+dd),a undocumented	Resets bit 0 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 1,(iy+dd),b undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 1,(iy+dd),c undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 1,(iy+dd),d undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 1,(iy+dd),e undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 1,(iy+dd),h undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 1,(iy+dd),l undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 1,(iy+dd)	Resets bit 1 of the memory location pointed to by IY plus `dd`.	—	4	23
res 1,(iy+dd),a undocumented	Resets bit 1 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 2,(iy+dd),b undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 2,(iy+dd),c undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 2,(iy+dd),d undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 2,(iy+dd),e undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 2,(iy+dd),h undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 2,(iy+dd),l undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 2,(iy+dd)	Resets bit 2 of the memory location pointed to by IY plus `dd`.	—	4	23
res 2,(iy+dd),a undocumented	Resets bit 2 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 3,(iy+dd),b undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 3,(iy+dd),c undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 3,(iy+dd),d undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 3,(iy+dd),e undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 3,(iy+dd),h undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 3,(iy+dd),l undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 3,(iy+dd)	Resets bit 3 of the memory location pointed to by IY plus `dd`.	—	4	23
res 3,(iy+dd),a undocumented	Resets bit 3 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 4,(iy+dd),b undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 4,(iy+dd),c undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 4,(iy+dd),d undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 4,(iy+dd),e undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 4,(iy+dd),h undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 4,(iy+dd),l undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 4,(iy+dd)	Resets bit 4 of the memory location pointed to by IY plus `dd`.	—	4	23
res 4,(iy+dd),a undocumented	Resets bit 4 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 5,(iy+dd),b undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 5,(iy+dd),c undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 5,(iy+dd),d undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 5,(iy+dd),e undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 5,(iy+dd),h undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 5,(iy+dd),l undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 5,(iy+dd)	Resets bit 5 of the memory location pointed to by IY plus `dd`.	—	4	23
res 5,(iy+dd),a undocumented	Resets bit 5 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 6,(iy+dd),b undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 6,(iy+dd),c undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 6,(iy+dd),d undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 6,(iy+dd),e undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 6,(iy+dd),h undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 6,(iy+dd),l undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 6,(iy+dd)	Resets bit 6 of the memory location pointed to by IY plus `dd`.	—	4	23
res 6,(iy+dd),a undocumented	Resets bit 6 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23
res 7,(iy+dd),b undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in B.	—	4	23
res 7,(iy+dd),c undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in C.	—	4	23
res 7,(iy+dd),d undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in D.	—	4	23
res 7,(iy+dd),e undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in E.	—	4	23
res 7,(iy+dd),h undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in H.	—	4	23
res 7,(iy+dd),l undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in L.	—	4	23
res 7,(iy+dd)	Resets bit 7 of the memory location pointed to by IY plus `dd`.	—	4	23
res 7,(iy+dd),a undocumented	Resets bit 7 of the memory location pointed to by IY plus `dd`. The result is then stored in A.	—	4	23