-----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Lindy Mayfield Sent: Monday, January 18, 2010 2:03 PM To: IBM-MAIN@bama.ua.edu Subject: Re: Source code for s/360
i can do that on vm? create my own instruction? <SNIPPAGE> I'd suggest modifying PGMFLIH (PCP, OS/360, etc.) to recognize PRIV & OP. Then using a table, use the OP to index and pickup the address of the "instruction" handler. This way, if the PIC 1 is set, you are handling a PRIV, if PIC 2 is set a user issued an instruction that is not supported for them. DOUBLE CHECK that the base 360 instruction set opcodes have not been reused!! As long as the instructions are not reused, you can effectively solve the I/O handling this way. The PSW:12 is going to be tough. That tells the S/360 hardware that you are doing ASCII or EBCDIC. Its meaning is very different today. Regards, Steve Thompson -- Opinions expressed by this poster may not reflect those of poster's employer -- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
