Started reviewing RENAME code but got into the error code return...

Discovered that the error code appears to get shifted out, so it is never returned properly.  Could this be part of the problem with error recovery?
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HD.WINDS3-S
RENAME

RNDIR (page 14)

BADOP->SYSRT1-> WINRET (PABERR)


CALDRV-->CALDRS/CALDR3 (SCSI/HFDC)--> 


CALDRS
       LI   R1,>E800          SCSI BUFFER PAGE, INSTEAD OF HDS1.
       MOVB R1,@MAP96+4       SET OUR DATA PAGE. @>8000
       MOVB @PAGD6,@MAP96+3
       SETO @>601E            SET TO ONE SCSIAC.  A SCSI CARD ACCESS.
       JMP  CLE2A             LET'S NOT CHECK FOR A HARD DRIVE VALIDATION CODE!

CALDR3 MOVB @PAGD6,@MAP96+3   @>6000
       C    @>6000,@WDS2TX
       JNE  HFDER7            error #7, device not installed
       CLR  @>601E            CLEAR SCSIAC.  NO SCSI ACCESS.
*
CLE2A  CLR  @HFDFLG
       MOVB @PAGD5,@MAP96+1   @>2000
       MOV  @>6004,R1         get DSR entry vector
       B    *R1

================

Return without error isn't clearing *R13!!!! SECTOR_S

SCBLAH1   LI   R0,>2000                      IF NECESSARY, SEND ERROR BACK.
          ORI  R15,>2000                     SET EQ BIT
          MOVB R0,*R13                       PUT ERROR CODE IN CALLER'S R0
          MOVB R0,@SCNOFF                    AND IN SCREEN OFFSET TOO.
SCWEXIT   MOV  @SAVR112,R11                  RESTORE RETURN ADDR.
          RT    

SCWRIEE CLR R0
        JMP SCWEXIT  

---------------------------------------------------------

WRITEC->SCSICOM->return error via SCSIERROR

READDC {
         SCSICOM calls BLWP @SCSICP (returns error in ERRCODE) 
	 SCSICOM moves @ERRCODE into R8

} returns error to SCSIERROR from R8, but incorrectly


however....

WRITEC: 
BL @SCSICOM
SLA R8,8
..we just shifted out the error byte!!!!!! 

SAme for read and write code... very suspicious...

There are THREE areas with the wrong error detection code.. ugh.
WRITEC has 2
READC has 1

---SCSIERROR is returned to 


BL    @SCSICOM
 MOV   R8,*R4
 SLA   R8,8
 MOV   R8,@SCSIERROR
 MOV   *R4,R8
 B     @L21