I've had the most fun with Hercules, poking around with "bare metal" programs.
Something I'm not likely to be able to do (especially these days) in the for seeable future. I started with the simplest 370 I/O (output) (see below), then did some "raw" dasd channel programming, then translated those to z-arch On 4/10/20, Charles Mills <[email protected]> wrote: .... - Nothing is trivial in assembler. (Not too bad if WTO is a valid approach, but if it requires opening a DCB, ...) ... Heh, never mind "a DCB" or WTO. Fire up Hercules, then grab your Principles of Operation, and start playing with "raw hardware" You might want to start with 370 i/o, before tackling z-Architecture I/O. Here's "Hello world" (370) on "bare metal" (hercules) u 2000.20 R00002000: 05C0 BALR 12,0 set base reg R00002002: 4120C01E LA 2,30(0,12) get CCW address R00002006: 50200048 ST 2,72(0,0) store it in the CAW R0000200A: 9C000009 SIO 9(0) start_io on the "console" device R0000200E: 8200C016 LPSW 22(12) halt devlist 9 0:0009 3215 *syscons cmdpref(/) noprompt pending R:00002020:K:06=09002030 0000000B 00000000 00000000 ................ R:00002030:K:06=C8C5D3D3 D640E6D6 D9D3C400 00000000 HELLO WORLD..... R:00002040:K:06=00000000 00000000 00000000 00000000 ................ R:00002050:K:06=00000000 00000000 00000000 00000000 ................ gpr CPU0000: GR00=00000000 GR01=00000000 GR02=00002020 GR03=00000000 CPU000 r 0 R:00000000:K:06=00080000 00002000 00020000 80005000 restart HHCPN038I Restart key depressed HHCCP011I CPU0000: Disabled wait state HELLO WORLD The same "hello world" is more complicated, needing an ORB block with it's various fields setup to point to the CCW Mike On 4/10/20, Bob Bridges <[email protected]> wrote: > It's taken me until this morning, as this thread continues, to realize that > maybe I don't know what Hercules does after all. "Mainframe emulation", > I'd > always heard, and supposed that meant that if I install Hercules on a PC > I'll be able to write REXX execs, write and submit JCL, create PDSs and > GDGs > etc - in other words, that Hercules emulates MVS. But if it doesn't > emulate > the mainframe operating system, what ~does~ it do? > > --- > Bob Bridges, [email protected], cell 336 382-7313 > > /* When a man is getting better he understands more and more clearly the > evil that is still left in him. When a man is getting worse, he > understands > his own badness less and less. A moderately bad man knows he is not very > good; a thoroughly bad man thinks he is all right. This is common sense, > really. You understand sleep when you are awake, not while you are > sleeping. You can see mistakes in arithmetic when your mind is working > properly; while you are making them you cannot see them. You can > understand > the nature of drunkenness when you are sober, not when you are drunk. Good > people know about both good and evil; bad people do not know about either. > -C S Lewis, _Christian Behavior_ */ > > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Seymour J Metz > Sent: Friday, April 10, 2020 06:34 > > Don't confuse IBM's position on Hercules with IBM's position on running its > licensed software on a platform for which it is not licensed. > > ________________________________________ > From: IBM Mainframe Discussion List [[email protected]] on behalf of > scott Ford [[email protected]] > Sent: Thursday, April 9, 2020 12:55 PM > > Until Hercules is sanctioned by IBM I wouldnt mentioned it. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
