At boot, the OCP would perform its Initial Program Load ( IPL ) from the nominated IPL device.
2.
This executable could then be booted ( " IPL'ed ", for " Initial Program Load " ) to perform the processing desired.
3.
The 4690 POS terminals ( registers ) load a copy of 4690 from the store controller into memory when they Initial Program Load ( IPL ).
4.
Both DOS and DOS-VS allow the number of partitions to be set at IPL ( Initial Program Load ), the IBM term for Boot load.
5.
It isn't needed for IPL ( " Initial Program Load " or boot ), as one can always clear a register without the need to save it.
6.
In OS / 360 load modules could be permanently loaded at Initial Program Load ( IPL ) time into an area of real storage known as the "'Link Pack Area "'( LPA ).
7.
The 711 was relatively slow and magnetic tape was much faster, so it was common for 7000 series installations to include an IBM 1401, with its high speed peripherals, to do card-to-tape and tape-to-line-printer operations off-line, with the 711 mainly used for initial program load of operating systems and diagnostics.
8.
Even bootstrapping of the system, or Initial Program Load ( IPL ) in IBM nomenclature, is carried out by channels, although the process is partially simulated by the CPU ( through an " implied " Start I / O [ SIO ] instruction, an " implied " Channel Address Word [ CAW ] at location 0 and an " implied " channel program [ CCW ], also at location 0 ).
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