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Sinclair ZX81 User Manual

Sinclair ZX81
92 pages
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188 inverse W BC cp h res 7,h
189 inverse X BD cp l res 7,l
190 inverse Y BE cp (hl) res 7,(hl)
191 inverse Z BF cp a res 7,a
192
""
C0 ret nz set 0,b
193
AT
C1 pop bc set 0,c
194
TAB
C2 jp nz,NN set 0,d
195 not used C3 jp NN set 0,e
196
CODE
C4 call nz,NN set 0,h
197
VAL
C5 push bc sel 0,l
198
LEN
C6 add a,N set 0,(hl)
199
SIN
C7 rst 0 set 0,a
200
COS
C8 ret z set 1,b
201
TAN
C9 ret set 1,c
202
ASN
CA jp z,NN set 1,d
203
ACS
CB set 1,e
204
ATN
CC call z,NN set 1,h
205
LN
CD call NN set 1,l
206
EXP
CE adc a,N set 1,(hl)
207
INT
CF rst 8 set 1,a
208
SQR
D0 ret nc set 2,b
209
SGN
D1 pop de set 2,c
210
ABS
D2 jp nc,NN set 2,d
211
PEEK
D3 out N,a set 2,e
212
USR
D4 call nc,NN set 2,h
213
STR$
D5 push de set 2,l
214
CHR$
D6 sub N set 2,(hl)
215
NOT
D7 rst 16 set 2,a
216
**
D8 ret c set 3,b
217
OR
D9 exx set 3,c
218
AND
DA jp c,NN set 3,d
219
<=
DB in a,N set 3,e
220
>=
DC call c,NN set 3,h
221
<>
DD prefixes instructions using ix set 3,l
222
THEN
DE sbc a,N set 3,(hl)
223
TO
DF rst 24 set 3,a
224
STEP
E0 ret po set 4,b
225
LPRINT
E1 pop hl set 4,c
226
LLIST
E2 jp po,NN set 4,d
227
STOP
E3 ex (sp),hl set 4,e
228
SLOW
E4 call po,NN set 4,h
229
FAST
E5 push hl set 4,l
230
NEW
E6 and N set 4,(hl)
231
SCROLL
E7 rst 32 set 4,a
232
CONT
E8 ret pe set 5,b
233
DIM
E9 jp (hl) set 5,c
234
REM
EA jp pe,NN set 5,d
235
FOR
EB ex de,hl set 5,e
236
GOTO
EC call pe,NN set 5,h

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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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