Addressing MVS control blocks from Hercules e.g. PSAAOLD/PSATOLD

Hi

 is it possible to address MVS control blocks from Hercules in ESA390.H

There are 2 definations for the PSA PSA_3XXX and PSA_390 when I add to
either on at offset hex 210/224 psatold/psaaold and try to view it via
MS Visual Studio debugger I get garbage  

 Can I do this ???