           ttl     SCSI Equates for the WIREWRAP KLUDGE BOARD
*
.   SCSI bit and byte definitions
.
RST        equ     2
SEL        equ     4
BSY        equ     8
MSG        equ     16
CD         equ     32
IO         equ     64
REQ        equ     128
HIGH       equ     $FF                 HIGH for open collector A side
LOW        equ     0
*
.   VIA Declarations
.
VIA        equ     via29               SBC-2 U29 (formerly floppy via)
DATA       equ     1+VIA               SCSI data bus
STATUS     equ     0+VIA               SCSI status lines
PCR        equ     12+VIA
DDRDATA    equ     3+VIA               SCSI data bus direction reg
DDRSTAT    equ     2+VIA               SCSI status bits direction reg
STATDDB    equ     %00000111           PB7 is REQ (input)
                                       PB6 is IO (input)
                                       PB5 is CD (input)
                                       PB4 is MSG (input)
                                       PB3 is BSY (input)
                                       PB2 is SEL (output)
                                       PB1 is RST (output)
                                       PB0 is LATCH CLOCK (output)
