doscp cannot copy 4,244,522-byte file

[ZKO3-2/S14]

I originally wrote:
 
	I cannot copy a file from a DOS partition to UNIX with doscp.
	I issue the commands
	    link /dev/rdsk/0s8 /dev/dos/C	;my DOS is in partition 3
	    doscp -bm C:/gnu/gnuemacs.tar /gnu

The file gnuemacs.tar is about 4.2 Mb long.

It turns out the link command is unnecessary.

Two people replied, suggesting increasing ulpatch, and using the "-16" 
switch on the doscp command.

To increase ulpatch, I issued, "patch /system5 ulpatch 8400", and rebooted.

I then issued, "doscp -bm C:/gnu/gnuemacs.tar /gnu".  This produced an 
output file of 486,400 bytes.

Issuing "doscp -bm -16 C:/gnu/gnuemacs.tar /gnu" produced an output file 
of 0 bytes, as reported by "ls -l".

In each case, the program stops; that is, after several seconds, the disk 
shows no activity.  Then I use the del key to get the # prompt back.  
(Earlier, I said the machine hung; I think I was mistaken.) 

When ulpatch was 2880, doscp copied 645,120 bytes; when I increased 
ulpatch to 8400, doscp copied only 486,400 bytes.

Regards, Robert.  (Apologies if this is a re-post: I can't tell whether 
                   my earlier attempt reached the newsgroup.)