Ok, here is an asm list of a READ macro and expansion with corresponding BDAM
options
READ PDA_DECB0, - DECB for read
DI,123,234,'S', - Read options
MF=L - Read l form
DS 0F
PDA_DECB0 DC A(0) EVENT CONTROL BLOCK
DC BL1'00000000' TYPE FIELD
DC BL1'01001000' TYPE FIELD (X'48')
DC AL2(0) LENGTH
DC A(123) DCB ADDRESS
DC A(234) AREA ADDRESS
DC A(0) IOB ADDRESS
DC A(0) KEY ADDRESS
DC A(0) BLKREF ADDRESS
The option DI means block addressing is being used, as can be discovered by
reading DFSMS Macro Instructions for Datasets. It's not an SVC of course, MF=E
does the usual BALR to the I/O routine in the DCB.
(Don't have the original posting to reply to).
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Von: IBM Mainframe Discussion List [mailto:[email protected]] Im Auftrag
von Tony Harminc
Gesendet: Samstag, 21. Juli 2012 00:23
An: [email protected]
Betreff: Re: BDAM READ with BLKREF of X'0'
On 19 July 2012 11:00, Thomas David Rivers <[email protected]> wrote:
> Thomas David Rivers wrote:
> The parms passed to the READ SVC (addressed by R1) are
>
> 0 X'00000000'
> 4 X'0048' 6 X'0000' (zero length, use the blksize from the DCB?)
> 8 X'0000BFF8' (address of the DCB)
> 12 X'00016000' (AREA ADDRESS)
> 16 X'00000000' (IOB ADDRESS)
> 20 X'00000000' (KEY ADDRESS)
> 24 X'0000c40c' (BLKREF ADDRESS)
What is this "READ SVC"?
Tony H.
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