Command 	record 0
Status		equ $00
ReadBlock	equ $01
WriteBlock	equ $02
Format		equ $03
Control		equ $04
Init		equ $05
Open		equ $06 ; character device
Close		equ $07 ; character device
Read		equ $08
Write		equ $09
SetFormatOption	equ $0a
GetFormatOption	equ $0b
		endr

Error		record 0
badCommand	equ $01
badPcount	equ $04
busError	equ $06
badUnit		equ $11
noInterrupt	equ $1f
badCode		equ $21
badParameter	equ $22
ioError		equ $27
noDrive		equ $28
noWrite		equ $2b
badBlock	equ $2d
diskSwitch	equ $2e
offLine		equ $2f
; $30-$3f = device specific
; $40-$4f = reserved
; $50-$5f = non fatal
; $60-$6f = non fatal version of $20-$2f
ioTerm		equ $69	
		endr

StatusDCB	record 0
pCount		ds.b 1
unit		ds.b 1
statusList	ds.w 1
statusCode	ds.b 1
		endr

IOBlockDCB	record 0
pCount		ds.b 1
unit		ds.b 1
dataBuffer	ds.w 1
blockNumber	ds.b 3 ; 24-bit
		endr

FormatDCB	record 0
pCount		ds.b 1
unit		ds.b 1
		endr

ControlDCB	record 0
pCount		ds.b 1
unit		ds.b 1
controlList	ds.w 1
controlCode	ds.b 1
		endr

InitDCB		record 0
pCount		ds.b 1
unit		ds.b 1
		endr

OpenDCB		record 0
pCount		ds.b 1
unit		ds.b 1
		endr

CloseDCB	record 0
pCount		ds.b 1
unit		ds.b 1
		endr

IODCB		record 0
pCount		ds.b 1
unit		ds.b 1
dataBuffer	ds.w 1
byteCount	ds.w 1
address		ds.b 3 ; 24-bit
		endr