Really? So I got the SVC 109 half wrong then? Is this correct? SVC routines go from 0 to 255 with 200 to 255 reserved for users.
SVC 109 routines 0 through 199 are reserved for IBM use. Otherwise I can go from ... 200 to 99999? Why did you say IGXyyxxx? What is the reason for yy vs xxxx? I have to admit that my references here are mostly Cannatello's book plus IBM docs that I can find. Lindy -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Robert A. Rosenberg Sent: Friday, December 22, 2006 5:03 AM To: [email protected] Subject: Re: Question about SVC 109 At 21:13 +0100 on 12/21/2006, Lindy Mayfield wrote about Question about SVC 109: >Can someone please tell me if I have gotten this right? (: > >SVC's are numbered from 0 to 255. > >From 0 to 199 are reserved for IBM use. > >SVC 109 is basically an SVC that can call an SVC from 0 to 255, and >again IBM has reserved 0 - 199 for their own use. This in essence >extends the range of SVC's from 256 to 256*2. > >SVC's called by SVS 109 can only be type-4 SVC's. > >Why not type-3? Nowdays, I cannot see any differences between >type-3 and type-4. Am I missing something? A Type3-SVC has a Module name of IGC00xxx (for SVC XXX with the 3rd X being signed [ie: A-I or X'C0']). A Type4-SVC has the Module Name of IGCyyxxx (XXX is the SVC Number and signed as above while the YY is the module number - 00 is the base module called via "SVC XXX" while any YY not equal to 00 is called by another IGCyyxxx Module). Most NEW SVCs are single Module and thus in theory Type3 but most old SVCs (Such as OPEN, CLOSE, and others), are still multi-Module and thus Type4. SVC 109 SVCs are all Type4 (even if only one module) but are named IGXyyxxx. You call "SVC 109" with yyxxx in R15. Thus if I load F'15245' into R15 and issue a SVC 109 it will link to IGX15245. Note that there are two other SVCs that do the same thing for Type1 and Type2 Extended SVCs. ---------------------------------------------------------------------- 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
