Article View: comp.lang.asm370
Article #312Re: IPL
From: A.LAWRENCE psuvax1.psu.edu a.law...
Date: Tue, 27 Mar 1990 05:03
Date: Tue, 27 Mar 1990 05:03
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1552 bytes
PROHVK38@TREARN.BITNET (orhan):
> Does anybody know IPL RECORD format ?
> This record is first record in any sub system device.
The standard IPL record on any System\370 device is 24 bytes.
It consists of 2 CCW's (channel command words) followed by a PSW
(Program Status Word).
The IPL function issues a read (X'02') command to the specified
device into location zero (sorry I don't remember the length), a TIC
(transfer in channel) to location zero to execute the CCW's just read.
When the channel program terminates, the PSW is loaded from location
X'000010'.
For a complete description of the process, refer to the "Princples
of Operation" manual for your particular computer.
---
On a clear disk you can seek forever.
-------------------------------------------------------------------------
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From: A.LAWRENCE@.UUCP ("psuvax1.psu.edu a.lawrence")
Newsgroups: comp.lang.asm370
Subject: Re: IPL
Message-ID: <9003271958.AA21995@lilac.berkeley.edu>
Date: 27 Mar 90 05:03:07 GMT
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