HLE is passing both of DEC tests (ZRXA and ZRXB), but I had to hack basicdsk.cpp to work around option_resolution::get_default() -- it is not yet reimplemented in c++:

Code
Connected to localhost.
Escape character is '^]'.


CHMDXC0 XXDP+ DX MONITOR
BOOTED VIA UNIT 0
28K NON-UNIBUS SYSTEM

ENTER DATE (DD-MMM-YY): 

RESTART ADDR: 152010
THIS IS XXDP+.  TYPE "H" OR "H/L" FOR HELP.

.R ZRXA??
ZRXAF0.BIC

MAINDEC-11-CZRXA-F

SWR = 000000  NEW = 
RXCS = 177170 RXDB = 177172 INT VECTOR = 264
CAUTION - IF YOU DESIRE TO TEST UNIT 0
REPLACE LOAD MEDIUM WITH A SCRATCH DISKETTE
THEN PRESS CONTINUE 001744
@P
DRIVE(S)  UNIT 0 UNIT 1       P= 0  T= 0  S= 0

DDDDD

Code
Connected to localhost.
Escape character is '^]'.


CHMDXC0 XXDP+ DX MONITOR
BOOTED VIA UNIT 0
28K NON-UNIBUS SYSTEM

ENTER DATE (DD-MMM-YY): 

RESTART ADDR: 152010
THIS IS XXDP+.  TYPE "H" OR "H/L" FOR HELP.

.R ZRXB??
ZRXBF0.BIC


CZRXBF0 RX11 INTERFACE TEST

SWR = 000000  NEW = 
G╫ТЙT PARAMETERS:      0
 TRACKS 52,53,114,0    FIRST=  1  LAST= 32

DDDDD