IBM OS/390 User Manual

 BLKSIZE = nnnn

BLKSIZE = nnnn

 DEVICE = nnnn

UNIT = (in DD statement)

 ERRBYTE = xxxxxxxx

(See description of SYNAD routine)

 IOAREA1 = xxxxxxxx

Area address (READ/WRITE macro)

 SEEKADR = xxxxxxxx

Not required (READ/WRITE macro)

 TYPEFLE = xxxxxx

OPEN macro option

 AFTER = YES

MACRF = (..WA..)

 DEVADDR = SYSnnn

UNIT = (in DD statement)

 ERREXT = YES

SYNAD = xxxxxxxx

 HOLD = YES

This function can be implemented by using
the ENQ/DEQ logic of MVS for a specific
resource or by requesting exclusive con-
trol of a data block thru MACRF = (..X..)

 IDLOC = xxxxxxxx

(See description of updating the file)

 KEYARG = xxxxxx

Keyaddress (READ/WRITE macro)

 KEYLEN = nnn

KEYLEN = nnn

 LABADDR = xxxxxxxx

EXLST = xxxxxxxx

 READID = YES

MACRF = (..RI..)

 READKEY = YES

MACRF = (..RK..)

 WRITEID= YES

MACRF = (..WI..)

 WRITEKY = YES

MACRF = (..WK..)

 RECFORM= xxxxxx

RECFM = xxx

 RECSIZE = (nn)

Length (READ/WRITE macro)
or DCB LRECL = nnnnn

 RELTYPE = xxx

OPTCD = (...,R...).No equivalent for DEC

 SEPASMB = YES

User must code the DCB

 SRCHM = YES

LIMCT= n,OPTCD = E

 TRLBL = YES

EXLST = xxxxxxxx

 VERIFY = YES

OPTCD = W

 XTNTXIT = xxxxxxxx

EXLST= xxxxxxxx

Figure 40. Comparison of DTFDA and DCB Macros

The error bytes used in VSE to test for successful completion of an I/O operation
are equivalent to a two-byte exception code in MVS. The two-byte exception
code is placed in the DECB (DECB+1) of the corresponding READ/WRITE macro
after a WAIT or CHECK macro has been issued.

If you issue a WAIT macro (WAITF in VSE), test for successful I/O completion
provide the appropriate actions.

In MVS, if you issue the CHECK macro, the system performs the test. If an
unusual condition occurs, the system branches to your SYSNAD routine if you
have provided one, or it abnormally terminates the job step.

The information provided in the two bytes is different in VSE and MVS. Therefore
change any parts of your programs that refer to these error bytes. Figure 41 on
page 313 gives a comparison of the VSE and MVS exception codes.

VSE to OS/390 Migration Workbook