Comparing CCW and zHPF channel programs

Table 1. Comparing CCW and zHPF channel programs
Function	CCW channel programs	zHPF channel programs
Devices supported	All	DASD only
Processors supported	All	EXCP and EXCPVR are only supported on a zEnterprise® 196 (z196) zEnterprise 114 (z114) or higher processor
Command set	All commands for all currently supported devices	Subset of DASD commands
Maximum channel program size	No limit	240 bytes because of the TCA size limit
Maximum data transferred per CCW or TCW	64 KB-1	64 KB, 2 MB, or 4 GB, depending on the processor
Read and write commands in the same channel program	Yes	No
Skip on read	CCW or MIDAW skip bit	TIDAW skip bit
Indirect addressing	IDAL, MIDAL	TIDAL
Data Chaining	Yes	No, but TIDAL is equivalent to data chaining.
Status modifier/search commands	Yes	No
Program controlled interrupt (PCI)	Yes	No
Append to running channel program	Yes	No
Self-modifying channel programs	Yes	No
VIO data sets	Yes	No