Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!UREGINA1.BITNET!VOGTMURR From: VOGTMURR@UREGINA1.BITNET Newsgroups: comp.lang.asm370 Subject: (none) Message-ID: <9001152112.AA20082@lilac.berkeley.edu> Date: 11 Jan 90 00:20:05 GMT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: IBM 370 Assembly Programming Discussion List Distribution: inet Organization: The Internet Lines: 19 From the recent discussion on CTCA's, I have the impression that you write a program that specifies the (virtual on CMS) addresses of the coupled CTCA's as channel device addresses and then tramsmits data from one to the other by means of an I/O program similar to one you would write for a DASD (disk). Until I get a chance to peruse the Guide, does someone care to confirm or contradict this impression? Since I read that a CTCA creates a link between two processors (or virtual processors on CMS), I thought that instructions like RDD (Read Direct), WRD (Write Direct) and SIGP (Signal Processor) would be used in a CTCA program. While I'm here: My system is a 4381 VM/SP running CP & CMS version 5. I have a System/370 Reference Summary, Fourth Edition, November 1976. Is it too out-of-date to be reliable? I noticed it doesn't give channel commands for the 3800 type of PRT currently defined for my virtual machine, nor for the 3370 or 3380 DASD's. This last question pertains to CMS. I know that the CMS nucleus, whose layout is described by the macro NUCON, occupies the low end of memory in the virtual machine. In that case, where are the Fixed Storage Locations, beginning with IPL PSW, IPL CCW1, IPL CCW2 etc., ending with the CPU extended logout area at D'512, which are an essential part of the 360 and 370 architecture? How can I examine or change this area in CMS? Does it differ from BC mode to EC mode?