VM370 Rel 6 Data Areas and Control Block Logic (Mar79)
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lLCCBLOK I'AA' = Cylinder has been allocated Note: The size of the T-disk ALCCMAP is variable aDd depends upon the nu.ber of cylinders in the range ALOCCYL1 to ALOCCYL2. Generally, the size of a given block is determined by the following formula: { (ALOCCYL2-ALOCCYL1+1+7} ALOCSIZE(doublevords) = +2 = + header Bytes per doublevord Note that bytes for cylinders that are not available are marked assigned. Section 1. CF Data Areas and Centrol Elocks 5
BSCBLOK ESCBLOK provides status, control information buffers (necessary for polling and addressing), and channel progra.s for 3270 re.ote equipment. The BDEVESC field in the RDEVBLOK points to the BSCBLOK. o 8 10 18 20 28 30 38 40 48 50 BSCSCCW1 BSCSCCW2 BSCSCCW3 BSCPCCW1 BSCPCCW2 BSCPCCW3 BSCPCCW4 BSCECCW1 BSCECCW2 BSCUECCW BSCSEL B*1 58 B*2 1 B*3 BSCINDEX I//////////BSCRISVD/////////// I I 60 1 BSCSPTR BSCAUSER 1----------------------------------------------------- 68 1 BSCUCOPY BSCRSTRT 1----------------------------------------------------- 70 1 BSCCNT 1 BSCSENSE BSCRCVD BSCSEND 1--------------------------------------------------- 78 1//////BSCUSER1///////////1 BSCRROBN 1----------------------------------------------------- 80 I BSCTMRQ BSCRESP 88 I BSCREAD 6 IBM VM/370 Data Areas and Control Block Logic