IBM System 3 / was Re: VTL/Dutchess logic

Rich Alderson RichA at
Mon Oct 11 13:51:07 CDT 2010

From: William Donzelli
Sent: Monday, October 11, 2010 11:36 AM

>> Just curious about the architecture: at the programmer's level did it look
>> like a primarily 8-bit machine, or a 16-bit machine which always processed 2
>> bytes in sequence, or it would best be described as mixed 8/16?

> S/3s worked with strings of bytes in memory, basically. Very non-traditional.

Not for IBM.  The 1401 was very much a character-oriented machine.

The S/3 was not, in general, programmed by user programmers in anything other
than RPG III, which went on to be the programming model for the System/3x and 
AS 400 families; IIRC the original RPG was a 1401 program product.

Rich Alderson
Vintage Computing Sr. Server Engineer
Vulcan, Inc.
505 5th Avenue S, Suite 900
Seattle, WA 98104

mailto:RichA at
mailto:RichA at

More information about the cctalk mailing list