Another member of the Siemens Simatic S5 family, clearly more recent than the other three, and on its way to a "field programming device" as they were called later.

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Dumping this machine would not have been possible without TeamE's invaluable service. He unsoldered and dumped one of the chips which I wouldn't have tackled myself and documented the machine while he was at it. Thanks!

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Two 720K disk drives, NEC V20 CPU, 512K RAM, 80x25 LCD screen

Later an upgrade was available:

"6ES5 635-OU.1. PG 635 programmer
6ES5 635-3SA.1 PG 635 upgrading kit

A new and more powerful version of the PG 635 programmer is
now available. This new PG 635 II offers the following features:
- One 40 Mbyte hard disk and one 3.5" floppy disk drive.
- Working memory increased from 512 Kbytes to 640 Kbytes.
- A Centronics interface for printers."

The software I have claims to be from an upgraded machine but is supposed to boot on the original as well. Unfortunately my disk drives both seem to be dead. Files on the FTP and here:

Siemens Simatic S5 PG 635

NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20