"Shmuel Metz (Seymour J.)" <[EMAIL PROTECTED]> wrote: >In <[EMAIL PROTECTED]>, on 02/01/2005 > at 08:26 PM, Charles Mills <[EMAIL PROTECTED]> said:
>>In spite of your :-) is that not how some of the floating point >>simulation works or used to work? VM uses a similar strategy for >>simulating privileged instructions for guests, catching the 0C2. >No; there never is an 0C2. CP catches the initial program interrupt. >BTW, OS/360 did the same thing for PI 01 on the 360/91, to simulate >missing instructions, and so did the "commercial instruction" feature >of the 360/44. The extended precision floating point routines were called from a user supplied SPIE routine, unlike the 360/91 decimal instructions which were done by the OS. -- glen ---------------------------------------------------------------------- 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
