rfka01, TeamE

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!

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.

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.