From:	ARISIA::EVERHART      2-SEP-1997 19:39:52.97
To:	SMTP%"info-vax@mvb.saic.com"
CC:	EVERHART
Subj:	CDwrite and vax/vms 7.1

In vax/vms V7.1, it is noted that cdwrite is getting an error that
says the channel is interlocked.

This might be cured by not setting the interlock flag, which is a recent
dk addition that may not be appropriate in this case.

In my copy of dkdriver the label DK$FDT_DIAGNOSE: is at address
25B2 in dkdriver.exe and looks like this:
>patch dkdriver.exe


  PATCH  Version 7.1    26-JUL-1995

%PATCH-I-NOGBL, some or all global symbols not accessible
PATCH>exam/inst 25b2
000025B2:  BBCS    #17,W^0140(R5),000025BB


This corresponds to the larger sequence
DK$FDT_DIAGNOSE:
        BBCS    S^#23,W^320(R5),LB_000025BB
        BRW     LB_000026DD
LB_000025BB:
        BBC     S^#22,W^320(R5),LB_000025D5
        CMPL    B^12(R3),W^460(R5)
        BEQL    LB_000025D5
        BICL2   I^#^X00800000,W^320(R5)
...

To remove the interlock, simply change the BBCS opcode to BBCC.
Glenn Everhart