Talk:IBM System/370

Archives (Index)

1

This page is archived by ClueBot III.

Infobox formatting

Figured I should add a note to apologise for my rather ugly fix for the way the infobox in the architecture section is rendering the surrounding text. Or mainly so that somebody who's less clueless about infobox markup than I am might do it properly. :D --Vometia (talk) 10:45, 28 June 2020 (UTC)

Cutoff point for S/370 compatible?

At what point should new or specialty processors no longer be listed in #Models sorted by date introduced (table)? In particular, should the box include:

• -155 II
• -165 II
• 9472
• P/370 card for PC
• R/370 card for RS/6000
• P/390 card for PC
• R/390 card for RS/6000
• Multiprise 2000
• Multiprise 3000
• 9672

Shmuel (Seymour J.) Metz Username:Chatul (talk) 16:46, 28 June 2020 (UTC)

Architecture details

If "IBM documentation numbers the bits in reverse order to that shown above", why not reverse the position numbers to agree with the documentation? Peter Flass (talk) 17:25, 28 June 2020 (UTC)

@Peter Flass: Something like this?

IBM S/370 registers

00 07 08 15 16 23 24 31 32 39 40 47 48 57 58 63 (bit position)* General-purpose registers 0 R0 Floating-point registers FP0 FP0 Control registers 0 CR0 Basic mode Program Status Word System Mask Key 0MWP Interrupt Code ILC,CC Program Mask Instruction Address BC mode Program Status Word Extended Control mode Program Status Word 0R00 0TIE Key 1MWP S0,CC Program Mask 00000000 00000000 Instruction Address EC mode Program Status Word Note: IBM documentation numbers the bits from high order to low order; the most significant (leftmost) bit is designated as bit number 0.

Shmuel (Seymour J.) Metz Username:Chatul (talk) 05:10, 9 November 2020 (UTC)

@Peter Flass: I've added PSW layouts through S/370-ESA; the tables could use some tweaking. Shmuel (Seymour J.) Metz Username:Chatul (talk) 15:41, 7 December 2020 (UTC)

What is "the successor"?

The term successor might refer to immediate successor or to final successor, but the article lists ESA/390 as the successor, and it is neither. The sequence of architectures is listed below; the successor should be shown either as 370 XA or as z/Architecture.

• System/370
• System/370 Extended Architecture
• Enterprise Systems Architecture/370
• Enterprise Systems Architecture/390
• z/Architecture

Also, 390 ESA is *NOT* a renaming of 370 ESA; it includes new features. Shmuel (Seymour J.) Metz Username:Chatul (talk) 02:22, 16 October 2020 (UTC)

Recent updates

@Guy Harris: First, I apologize for inadvertently posting an incomplete update.

Second, my intent was that the footnote listing the constituent program products of MVS/XA include the table; I inadvertently terminated the {{refn}} prematurely. The table itself uses <ref>...</ref>, so I can't put it inside <ref>...</ref>. When I tried putting the table inside {{refn}}, the footnote rendered with just "{".

Also, there seems to be something wrong with my style="align:left"; the name header label is centered. Shmuel (Seymour J.) Metz Username:Chatul (talk) 23:04, 13 December 2020 (UTC)

Can footnotes include tables? And, if they can, would that make them too big to make sense? Guy Harris (talk) 23:10, 13 December 2020 (UTC)

PSW tables

The article currently has these tables for PSW format

• S/370 BC mode
• S/370 EC mode
• S/370-XA
• ESA/370

The format for ESA/390 is identical to that for ESA/370, but the names of two bits in the program mask have been changed to reflect that they apply only to hexadecimal (legacy) floating point as opposed to binary (IEEE) floating point. I'm considering three options:

1. Add an ESA/390 table that is almost identical to the ESA/370 table.
2. Add footnotes to bits 22 and 23
3. Add text to the ESA/370 table to show both names for bits 22 and 23

Which option is best?

Also, the tables should be copied to Program status word once complete. Shmuel (Seymour J.) Metz Username:Chatul (talk) 14:35, 22 December 2020 (UTC)