The actual PSW in the processor is 16 bytes, but the short form PSW in storage is 8 bytes.
________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Joe Monk <[email protected]> Sent: Tuesday, January 10, 2023 6:07 PM To: [email protected] Subject: Re: Question and CZAM and IPL Ok, but the machine immediately changes it to a 16-byte PSW before it uses it correct? Joe On Sun, Jan 8, 2023 at 10:33 PM Jim Mulder <[email protected]> wrote: > The IPL PSW provided by software is always 8 bytes. > There is no provision for providing a 16 byte PSW. > > Jim Mulder > > -----Original Message----- > From: IBM Mainframe Discussion List <[email protected]> On Behalf > Of Joe Monk > Sent: Sunday, January 8, 2023 4:27 AM > To: [email protected] > Subject: Question and CZAM and IPL > > When a z/arch machine has CZAM installed, is it possible to use a short > PSW to IPL. Or, does the short PSW always become a long PSW before IPL, so > it is better to use a long PSW to start with? > > In POPs, it says on page 3-75: > > "When the CZAM facility is installed, the IPL PSW has the short-PSW > format, as shown in Figure 4-3 on page 4-8." > > But on page 4-8, it says: > > "Note: The term short PSW refers only to the eight-byte entity in storage. > The actual PSW used by the CPU is the 16-byte register illustrated in > Figure 4-2." > > Joe > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, send email > to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
