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Chapter 3. Initial Program Load Programs
Diskette IPL Bootstrap (IP)
WHAT THIS UTILITY DOES
When you press the LOAD key on the console, the hardware loads the bootstrap into
main storage from the diskette. The bootstrap, in tum, loads the contents of cylinder 1,
head 0, from the IPLed diskette. When the bootstrap is finished, register 7 contains the
device address of the diskette you IPLed from. The program is loaded into the high end
of storage and then given control.
HOW TO CREATE A DISKETTE
HOW TO USE IT
You must create a special diskette for the diskette IPL bootstrap. See example below.
Locate the ccchss of the program IP on the system verification listing. Using the disk to
diskette copy program, copy the program IP to the diskette. You must start the copy 1
disk sector beyond the beginning of the program to remove the header record. IP must be
placed on the diskette at cylinder 0, head 0, sectors 1 and 2.
You invoke this utility by setting the IPL switch to alternate (diskette) and then pressing
the LOAD key.
Note. The bootstrap must be on cylinder 0, head 0, sectors 1 and 2 of the diskette.
Initial Program Load Programs
3-1
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