ZiLOG Z80-RIO Operating System User's Manual page 214

EXAMPLEl.MCZ
LOC
OBJ CODE M STMT SOURCE STATEMENT
ASM 5.7
1
EXAMPLE 1 -- MAKE A SYSTEM CALL TO PRINT A MESSAGE
2
3
4
0000 FD210800 R
5 LD
IY,AVEC IY -) I/O VECTOR
0004 CD0314 6
CALL SYSTEM
0007 C9 7 RET
8
9
10 AVEC:
0008 02 11
AVLUN: DEFB CONOUT LOGICAL UNIT NUMBER
0009
10 12 AVREQ: DEFB WRTLIN
REQUEST CODE
OOOA
1300 R 13 AVDTA: DEFW MSG DATA TRANSFER
14
ADDRESS
OOOC
2400 15 AVDL: DEFW LMSG BYTE COUNT
OOOE 0000 16 AVCRA: DEFW
0
COMPLETION RETURN
17 ADDRESS
0010 0000
18 AVERA: DEFW 0
ERROR RETURN ADDRESS
0012
00 19 AVCC: DEFB
0
COMPLETION CODE
20
21 : EQUATES AND CONSTANTS
22
23 SYSTEM: EQU
1403H
SYSTEM ENTRY POINT
24
CONOUT: EQU 2 CONSOLE OUTPUT UNIT
25
WRTLIN: EQU 10H
WRITE LINE REQUEST
26
CODE
27
0013 454E4F52
28 MSG: DEFM
'ENORMOUS CHANGES AT THE LAST MINUTE'
0036 00 29
DEFB
DOH
30 LMSG: EQU $-MSG
31
32 END
CROSS REFERENCE EXAMPLEl.MCZ
SYMBOL VAL M DEFN REFS
AVCC 0012 R
19
AVCRA OOOE R
16
AVDL
OOOC R 15
AVDTA OOOA R 13
AVEC 0008 R 10
5
AVERA 0010 R 18
G-2