Talk:PC-based IBM-compatible mainframes

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Unnamed section[edit]

Here is a list from a patient troll regarding the AT/370, and its patents.

  1. IBM, Product Announcement, Models 919 and 939 of the AT/370-5170, Apr. 2, 1986
  2. IBM, Product Announcement, IBM VM/PC Version 2.01, Nov. 4, 1986
  3. IBM, Product Announcement, IBM VM/PC Version 2.0, Nov. 5, 1985
  4. IBM, Product Announcement, IBM VM/PC Host Server, Nov. 5, 1985
  5. 4 charts from the IBM PC-XT/370 Planning and Installation
  6. 2 charts from non-contiguous pages of a unnamed source for IBM's PC-XT/370
  7. Letter to Mike Scroggie from D. G. Serfass of IBM regarding IBM's PC-XT/370
  8. 2 Pamphlets advertising the PC-XT/370
  9. Bill Machrone, The Mainframe Marketplace: XT/370 and 3270 PC, PC Magazine, Jan. 24, pp. 146, 154, 1984
  10. Off-Loading Mainframe Program Development to Micros Gains Momentum, unknown author & source
  11. Paul Korzeniowski, Price, Software, Delivery Delays Hamper IBM XT/370 Acceptance, Computerworld, Oct. 22, pp. 1, 4, 1984
  12. Eric Bender, AT/370 unveiled, enhancements to XT/370, 3270-PC, Computerworld, Oct. 29, pp. 1 and 6, 1984
  13. Sam Whitmore, XT/370 Promise Seen Unrealized as Market Now Prepares for the AT/370, PC Week, pp. 3
  14. Joe McLean, New IBM PC Workstations Target Professional Users, Electronic News, Oct. 24, 1983
  15. PC World, article about IBM's PC-XT/370
  16. Wendy Rauch-Hindin, IBM's VM/CMS Operating System Moves to Micros, Systems & Software, Dec., pp. 47-51, 1983
  17. PCs as Programmer Work Stations, Software Maintenance News, Nov., p. 24, 1986
  18. Microfocus Product Announcement, Microfocus Announces PC-CICS for the IBM PC, Sep. 8, pp. 1-11, 1986
  19. Microfocus Press Release, Microfocus Annouces PC-CICS for the IBM PC, Sep. 8, 1986
  20. Jeffry Beeler, CICS Development and Code Testing Moves to Micros, pp. 1 and 4
  21. Micro Focus Development Software Allows Mainframe Programming on the PC, PC Week
  22. What's New, Byte, May 1985

This link is a performance evaluation of the XT/370 by NASA —Preceding unsigned comment added by (talk) 01:26, 24 February 2011 (UTC)


I'm not really happy with the title. These things were mainframe emulators, not mainframes themselves. Is there a better name for this class of product? "PC-based mainframe emulators" might be better. Did any other mainframe company also make a desktop with the same instruction set? --Wtshymanski (talk) 16:56, 24 February 2011 (UTC)

Is it a mainframe emulator when the CPU runs the mainframe instruction set natively? The P/370 and P/390 processor boards did just that, even if you don't agree the XT/370 and AT/370s did. -- Jay Maynard (talk) 18:24, 24 February 2011 (UTC)
Well, it's running the instruction set, but isn't a "mainframe" defined by a lot more than its instruction set? The little desktop box huffing and puffing away at a 5 1/4 inch hard drive isn't doing anywhere near the sort of job the roomfull of racks is doing. What did IBM call this class of product? --Wtshymanski (talk) 18:51, 24 February 2011 (UTC)
Good question. IIRC, the P/370 and P/390 were called "personal mainframes", but I could easily be wrong, too. I do know the Multiprise systems were called mainframes with no qualifiers. -- Jay Maynard (talk) 04:35, 25 February 2011 (UTC)
Well, that wouldn't be the first instance of hype in the computer business, but it still sounds a little like calling a garden tractor a "personal locomotive". I wish the title was a little better but it has kind-of the right associations - running some types of mainframe software on a micro, even if it doesn't have the performance. I should ask myself "Is anyone going to seriously confuse the desktop box with the dinosaur pen?" - probably not. --Wtshymanski (talk) 14:18, 25 February 2011 (UTC)

AT/370 DMA[edit]

The Mueller book says the AT/370 cards were the same as those for the XT/370, but *this* article says the AT/370 could do 16-bit DMA, an impossiblility for a card that fits in an XT slot. We need a citation for 16-bit DMA. --Wtshymanski (talk) 14:26, 25 February 2011 (UTC)


This section seems to contain a bit of puffery. Twice as much text as Hercules? Peter Flass (talk) 13:30, 30 January 2013 (UTC)

Looks like it might have been merged from separate article. I'll par it down. This page badly needs to cover the present and only IBM-made/supported product for this, the zPDT. Someone not using his real name (talk) 20:43, 6 February 2014 (UTC)