The ZAP command

The ZAP command is used to modify areas of storage in the CYN1 address. The form of the ZAP command is as follows:

F {xxxx | yy},ZAP,{AS|SS},hexaddr,hexcont,hexrepl

AS|SS: AS stands for address space dump. SS stands for address space authorized. Either one must be specified.
hexaddr: It specifies an eight-digit hexadecimal address of the word to be zapped. Low core (4 kilobyte PSA) zapping is always disabled. System region, for example, virtual addresses 00001001 through 00005000 can only be zapped if SS address space authorized option is specified.
hexcont: It specifies the eight-digit hexadecimal current contents of the word to be zapped, for verification.
Hexrepl: It specifies the eight-digit hexadecimal value to replace hexcont with at address hexaddr.

Examples:

Table 1. Examples of Zap command
Valid	Invalid
F CC,ZAP,SS,0000100F,E8000000,000 00000	F CC,ZAP,AS,00000000,040C0000,00000000 F CC,ZAP,SS,00000000,040C0000,00000000 Note: It is invalid because the area to be zapped is in the PSA.
F CC,ZAP,AS,028AC300,001F007A, 00000000 zeroes the word at virtual address 028AC300 location.	F CC,ZAP,AS,0000100F,E8000000,00000000 Note: It is invalid because the area to be zapped is in the system region.