CXRPDD0

RPD is an IOMODX which will exersize up to 8 RP04/5/6 disk drives on an RH11/RH70 controller, or dual-ported between two such controllers. In single-port mode, the entire surface of each disk will be testable (randomly or systematically).

In dual-port mode, the "A" controller module will access only the lower half of the disk, and the "B" controller module will access only the high half of the disk; no communication will be attempted between the two ports. One copy of this module must be configured for each port.

Single/dual port mode will be automatically selected on the basis of the RPDT register of each drive.

During testing, any bad sector found will be stored automatically and without operator intervention into the module's BADSPOT table. A message can be printed to notify the operator of the BADSPOT address (see Operator Options). Sectors listed in the table will not be tested on any drive.

The WB0FRQ word in the header may be changed at will to alter the module's transfer size (and of course A and B-port sizes need not match): this will not alter the effectiveness of the BADSPOT table or cause the module to attempt access of out-of-range disk addresses. Within this framework, the modules will access as much of the disk as possible. Random seeks will be used unless this option is deselected in SR1.