perm filename HECHG.DOC[SYS,HE] blob sn#129814 filedate 1974-11-12 generic text, type C, neo UTF8
COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002						12 Nov., 1974
C00006 ENDMK
C⊗;
					12 Nov., 1974

	A new HELIB has  been put up.  PICSPL, which  spools TV image
output, and PICWR, which writes TV image files on the disk, have been
modified for the new date format.  If you use them you  should reload
as soon as possible. 

	File VIDEO,  the  DDVID interface,  has been  modified.   The
following  portions  of the  documentation  for this  file  should be
changed:

1.  Replace the description of procedure JOBOK with:

	This procedure checks the status of DDVID jobs and returns an
integer in JOBNO which  is the job number of a DDVID job, if at least
one exists, which will be sent commands.  The value of  the procedure
is decoded as follows: (All routines will send commands to DDVID will
fail if a value greater than 0 is not returned)

	0	No copies of DDVID are running.  JOBNO←0.

        1       More than one copy  of DDVID is running and  there is
                no copy with  your PPN.  The one with the highest job
                number will be returned. 

        2       There is only one copy of DDVID  running, or only one
                running with your PPN.  It will be retured. 

        3       There is  more than  one copy  of DDVID running  with
                your PPN.   The one with the  highest job number will
                be returned. 

2.  Under 'SENDING PICTURES TO DDVID', the second paragraph should be
replaced by the following:

	The procedures will call JOBOK to get a copy of DDVID to use. 
If  none is available, an  error message is typed.   If the interface
cannot get a  second segment  to use (all  job slots are  in use)  an
error message will be typed and no  picture can be sent.  If the copy
of DDVID will not accept the commands sent to it, the procedures will
type:

	DDVID not accepting commands
	type R<CR> to retry, <CR> to fail

Typing R will win if DDVID was busy  processing your last command, or
something from  some other job; it will not win  if the copy of DDVID
you are using  is hung or stopped.   The interface  will not try  any
other copies which may be around at this point.  The procedures below
return TRUE if the command and picture were successfully transmitted;
FALSE if any errors occured.   They do not wait for DDVID  to display
the picture.