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Sinclair ZX81 User Manual

Sinclair ZX81
92 pages
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41 D 29 add hl,hl sra c
42 E 2A ld hl,(NN) sra d
43 F 2B dec hl sra e
44 G 2C inc l sra h
45 H 2D dec l sra l
46 I 2E ld l,N sra (hl)
47 J 2F cpl sra a
48 K 30 jr nc,DIS
49 L 31 ld sp,NN
50 M 32 ld (NN),a
51 N 33 inc sp
52 O 34 inc (hl)
53 P 35 dec(hl)
54 Q 36 ld (hl),N
55 R 37 scf
56 S 38 jr c,DIS srl b
57 T 39 add hl,sp srl c
58 U 3A ld a,(NN) srl d
59 V 3B dec sp srl e
60 W 3C inc a srl h
61 X 3D dec a srl l
62 Y 3E ld a,N srl (hl)
63 Z 3F ccf srl a
64
RND
40 ld b,b bit 0,b in b,(c)
65
INKEY$
41 ld b,c bit 0,c out (c),b
66
PI
42 ld b,d bit 0,d sbc hl,bc
67 not used 43 ld b,e bit 0,e ld (NN),bc
68 not used 44 ld b,h bit 0,h neg
69 not used 45 ld b,l bit 0,l retn
70 not used 46 ld b,(hl) bit 0,(hl) im 0
71 not used 47 ld b,a bit 0,a ld i,a
72 not used 48 ld c,b bit 1,b i c,(c)
73 not used 49 ld c,c bit 1,c out (c),c
74 not used 4A ld c,d bit 1,d adc hl,bc
75 not used 4B ld c,e bit 1,e ld bc,(NN)
76 not used 4C ld c,h bit 1,h
77 not used 4D ld c,l bit 1,l reti
78 not used 4E ld c,(hl) bit 1,(hl)
79 not used 4F ld c,a bit 1,a ld r,a
80 not used 50 ld d,b bit 2,b ld d,(c)
81 not used 51 ld d,c bit 2,c out (c),d
82 not used 52 ld d,d bit 2,d sbc hl,de
83 not used 53 ld d,e bit 2,e ld (NN),de
84 not used 54 ld d,h bit 2,h
85 not used 55 ld d,l bit 2,l
86 not used 56 ld d,(hl) bit 2,(hl) im 1
87 not used 57 ld d,a bit 2,a ld a,i
88 not used 58 ld e,b bit 3,b in e,(c)
89 not used 59 ld e,c bit 3,c out (c),e

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Sinclair ZX81 Specifications

General IconGeneral
ProcessorZilog Z80A
Processor Speed3.25 MHz
ROM8 KB
InputMembrane keyboard
StorageCassette tape
Power Supply9V DC
Dimensions167 mm x 40 mm x 175 mm
Release Year1981
ManufacturerSinclair Research
Weight350 g
Operating SystemSinclair BASIC
RAM1 KB
PortsTV out, expansion port
DisplayTelevision (RF modulator output)

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