From: slavotinek@gmail.com   
      
   On 28.12.2022 20:50, Tomas Slavotinek wrote:   
   > All T1 system ROMs contain IBM SCSI extensions consisting of the   
   > "standard" Int 13 routines and a proprietary Int 4Bh func. 80h - "IBM   
   > SCSI interface." This iface provides extended SCSI services, incl. SCB   
   > (Subsystem Control Block) support.   
      
   The "non-enhanced" T1 and T2 IML code doesn't even register the Int 4Bh   
   handler... despite it being available. But that's not surprising I   
   guess, since it doesn't need it. Stage 2 POST or the standalone SCSI ROM   
   may still install the handler (and probably do so).   
      
   One difference between the "non-enhanced" T1 and T2 ROMs is that the T2   
   lacks the ESDI code.   
      
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