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PortDDB	struct 
DDB_header	db	size DDB dup (?) ; header - see ddb.inc 
 
; 
; port driver private fields go here 
; 
 
DDB_port_private	db 1 dup (?)	 
DDB_irq_number		db ? 
DDB_irq_handle		dd ? 
DDB_port_flags		dd ? 
DDB_base_ioa		dw ? 
 
PortDDB	ends 
 
; 
; DDB_port_flags flags follow 
; 
 
DDB_BF_IRQ_SHARED	equ 1 
DDB_BF_ACTIVE_BIT	equ 1 
DDB_BF_ACTIVE	equ 1 SHL DDB_BF_ACTIVE_BIT  
 
; 
; various equates 
; 
 
MAX_DRIVES		equ 2