Radoslaw, This thread started with the following question:
Am I correct in believing that the method to obtain the equivalent of CSA above the bar is to use macro IARV64 with the REQUEST=GETSHARED option? Then one of the other said: Since CSA is available to everyone, how do you make this 'above the 4GB bar' storage available to everyone (read only)? Another said this: If a 24-bit or 31-bit address is interpreted as or expanded to a 64-bit address and the high-order bit happens to be on, that would cast the virtual address into the 2-4 gigabyte range and unpredictable effects could ensue. With my limited experience I deducted the following: Someone wants to create a shared block of memory CSA/not and share it between programs. My understanding is that a 24-bit program can address 24-bit addresses, 31-bit...., 64-bit... So in my inexperienced mind the 24bit program could never share in the happiness of this above the bar heaven of shared storage. Regards Herbie -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of R.S. Sent: 06 November 2007 13:13 To: [email protected] Subject: Re: CSA 'above the bar' Ted MacNEIL wrote: >> Just curious: how S/360 *24-bit* programs could have problems with >> memory between 2-4G ??? > > Radaslow, I don't understand your question! > 24-bit programmes cannot access virtual above 16Mb. > The dead zone is not a problem for real occupancy. Ted, I'm not so slow, call me RadaFAST (or Radoslaw) <g> I understand, the hole is only in virtual memory, the real memory between 2G and 4G will not be wasted. However I don't understand the reason why any bit in any 24-bit address could mess someting in 64-bit addressing mode. Is it a problem with low-order bit ? -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sąd Rejonowy dla m. st. Warszawy XII Wydział Gospodarczy Krajowego Rejestru Sądowego, nr rejestru przedsiębiorców KRS 0000025237 NIP: 526-021-50-88 Według stanu na dzień 01.01.2007 r. kapitał zakładowy BRE Banku SA (w całości opłacony) wynosi 118.064.140 zł. W związku z realizacją warunkowego podwyższenia kapitału zakładowego, na podstawie uchwał XVI WZ z dnia 21.05.2003 r., kapitał zakładowy BRE Banku SA może ulec podwyższeniu do kwoty 118.760.528 zł. Akcje w podwyższonym kapitale zakładowym będą w całości opłacone. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html Elavon Financial Services Limited Registered in Ireland: Number 418442 Registered Office: Block E, 1st Floor, Cherrywood Business Park, Loughlinstown, Co. Dublin, Ireland Directors: Robert Abele (USA), John Collins, Terrance Dolan (USA), Pamela Joseph (USA), Declan Lynch, John McNally, Malcolm Towlson Elavon Financial Services Limited, trading as Elavon, is regulated by the Financial Regulator ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
