Intro to VM CP & CMS 5/25/2019

Environments CP CMS The real O/S running the mainframe Commands control virtual machine CMS A “shell” & “mini O/S” Has page 0 reserved storage, same as CP Can process virtual interrupts Virtual privileged mode File system Commands for file system & more © D. J. Foreman, 5/25/2019

Environmental hints RUNNING MORE … will auto-clear in 30 seconds data pending for display must clear the screen to see it HOLDING must click on the “clear” button CP READ commands go directly to CP VM READ commands go to CMS You may “pass” commands to CP via “CP” prefix E.g.; CP Q TIME © D. J. Foreman, 5/25/2019

CMS structure Minidisk - Disk storage Access mode - letter (A-Z) assigned to a disk Search order – like “path” in Windows or Linux but only contains access mode letters “flat” file system No “folders” Files have a name, a type and a mode-letter E.g.; sos assemble a Default mode-letter is “A” © D. J. Foreman, 5/25/2019

More on structure Search order z/a means search ‘z’ as if it was at end of ‘a’ R/O disk is read only RW disk is read & write Shared file system (SFS) (not available for 552) Hierarchical file system Extends CMS file system Sub-directories Multi-user accessible © D. J. Foreman, 5/25/2019

Bingtjw 3270 login screen © D. J. Foreman, 5/25/2019

Logging in CMS shell auto-starts PROFILE EXEC – Rexx script runs Connects to Foreman’s 999 as your “Z” disk Sets up for printing Screen captures Files Runs PROFILE2 EXEC (also in Rexx) Sets up colors Sets up F-keys F2 = retrieve F3 = clear screen Asks for re-boot into Linux © D. J. Foreman, 5/25/2019

Some basic CP commands Ipl like BIOS, loads an O/S I CMS I 222 (to “boot” your SOS program) Query - ask about virtual environment SET - change virtual environment Begin - resumes execution Trace - instruction tracing, like gdb in Linux Display - show RAM, PSW, register content Commands are NOT case sensitive © D. J. Foreman, 5/25/2019

CMS Command Syntax Command [Operands] [( options] Commands have a “minimal truncation” The ( is required preceding any options Commands are NOT case sensitive © D. J. Foreman, 5/25/2019

Some basic CMS commands HELP - activities & specific commands ACcess - put a disk in the search order Query - file system & other info Search - lists disks in search order Disk - lists virtual disks Time SET - file system & environment SENDFile Fn Ft to user at loc (SMTP FILEList hx - halts execution of a CMS program © D. J. Foreman, 5/25/2019

More CMS commands Load - links elements of a program Genmod - makes a RAM image of a program COPYfile - copies files Print - send a file to the output queue - should be available via Pharos TELL - sends a message to another user #CP - forces command directly to CP - bypasses any outstanding “read” - never seen by user’s program © D. J. Foreman, 5/25/2019

XEDIT Built into CMS Command driven Expandable via REXX programs See Z-disk for examples Tailorable elements Colors Layout © D. J. Foreman, 5/25/2019

Some Xedit commands Commands operate from “current line” to end f, b scroll forward or back .name scroll to named line top scroll to top of file bot scroll to bottom of screen /string locate “string” c/s1/s2 change s1 to s2 c/s1/s2/* change s1 to s2 on all lines c/s1/s2/3 4 change s1 to s2 on 3 lines for up to 4 occurrences per line © D. J. Foreman, 5/25/2019

Xedit “line” commands .name names a line c copy cc copy multiple lines (must be paired) a after b before © D. J. Foreman, 5/25/2019

REXX Similar to many procedural languages All variables are strings PL/1 Perl Pascal All variables are strings Built-in conversion as needed Text parsing function © D. J. Foreman, 5/25/2019

Special setup instructions for advanced O/S class Format 222 I Creates the CMS file system for this disk Puts disk in search order as disk “I” Format 222 I 4 (recomp Reserves 1 cylinder for SAL You only need to do this ONE TIME © D. J. Foreman, 5/25/2019