System information

IOPB: ;IO PARAMETER BLOCK
1867 80 DB 80H ;NORMAL I/O OPERATION
1868 04 IOF: DB READF ;IO FUNCTION, INITIAL READ
1869 01 ION: DB 1 ;NUMBER OF SECTORS TO READ
186A 02 IOT: DB OFFSET ;TRACK NUMBER
186B 01 IOS: DB 1 ;SECTOR NUMBER
186C 8000 IOD: DW BUFF ;IO ADDRESS
;
;
; DEFINE RAM AREAS FOR BDOS OPERATION
ENDEF
186E+= BEGDAT EQU $
186E+ DIRBUF: DS 128 ;DIRECTORY ACCESS BUFFER
18EE+ ALV0: DS 31
190D+ CSV0: DS 16
191D+ ALV1: DS 31
193C+ CSV1: DS 16
194C+ ALV2: DS 31
196B+ CSV2: DS 16
197B+ ALV3: DS 31
199A+ CSV3: DS 16
19AA+= ENDDAT EQU $
013C+= DATSIZ EQU $-BEGDAT
19AA END
Appendix A : The MDS-800 BIOS CP/M Operating System Manual
A-14