SuperZap

(tool, IBM)An IBM utility program used to quickly patchoperating system or application program executable codein preference to editing the source code and recompiling.

The SuperZAP program was a quick hack written by one IBMEngineer, possibly from IBM UK, in the late 1960s to directlyfix executable files. He needed to fix a bug but it wouldhave taken hours to rebuild the vast OS/360 executables.

The S/360 architecture has an instruction ZAP (Zero and AddPacked) for packed decmial arithmetic, that sets the byte ata given address to a given value. Superzap used this to writedata given as a string of hex digits to a given location in anexecutable file in a matter of seconds.

Soon the IBM development labs were releasing all ProgrammingTemporary Fixes (PTFs) to OS/360 in this form. OS/360included a version called IMASPZAP or AMASPZAP which persistedthrough MVS, MVS/SP, MVS/XA, OS/390 and probably stillremains in z/OS, the distant descendent of OS/360.

[Private 2004-02-05 e-mail from Chris Gage, IBM employee andSuperZap user, 1970-].

单词	superzap
释义	SuperZap SuperZap (tool, IBM)An IBM utility program used to quickly patchoperating system or application program executable codein preference to editing the source code and recompiling. The SuperZAP program was a quick hack written by one IBMEngineer, possibly from IBM UK, in the late 1960s to directlyfix executable files. He needed to fix a bug but it wouldhave taken hours to rebuild the vast OS/360 executables. The S/360 architecture has an instruction ZAP (Zero and AddPacked) for packed decmial arithmetic, that sets the byte ata given address to a given value. Superzap used this to writedata given as a string of hex digits to a given location in anexecutable file in a matter of seconds. Soon the IBM development labs were releasing all ProgrammingTemporary Fixes (PTFs) to OS/360 in this form. OS/360included a version called IMASPZAP or AMASPZAP which persistedthrough MVS, MVS/SP, MVS/XA, OS/390 and probably stillremains in z/OS, the distant descendent of OS/360. [Private 2004-02-05 e-mail from Chris Gage, IBM employee andSuperZap user, 1970-].
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