[cctalk] Re: Operating system, on punch cards?

Jon The interface card on most of Fanuc's PTRs is https://www.emeritus-solutions.com/papertape/fanuc/A20B-0007-075D_FanucPtrL… the SN7437are 5V TTL Buffers, not OC but when did manufacturers trouble with standards. However, that is the 8 bit parallel output, you can find a toy P to S interface with foot pedal hold for it at https://www.emeritus-solutions.com/papertape/fanuc/FanucInterFace1.zip The controller for a RtR transport is https://www.emeritus-solutions.com/papertape/fanuc/A20B-0004-0280&0270_… the CNT3 input pins are the somewhat open questions. And, while there is a little status feedback, on CN3, there is no dedicated handshake line. Also, there are rewind, stop and hold command lines. It is the usage of this interface, especially in the context of the larger CNC controller (on a Fanuc Mill / Lathe) which I seek. The best way forward is probably to interface the RtR to a "controller" and to experiment; the controller being a convenient SoC. From what you write, it sounds as though this interface, with the transport to manage, is rather more complex than the necessary BTR subset. Martin PS Are the AB manuals readily available ? Even operations manuals are hens teeth for Fanuc -----Original Message----- From: Jon Elson via cctalk [mailto:cctalk@classiccmp.org] Sent: 03 March 2026 00:01 To: cctalk(a)classiccmp.org Cc: Jon Elson <elson(a)pico-systems.com> Subject: [cctalk] Re: Operating system, on punch cards? On 3/2/26 16:16, Martin Bishop via cctalk wrote: RS-323 was the standard for paper tape readers on CNC machines. It was not a 5V logic level interface, but was compatible with open-collector drive TTL chips. Quite simple, 8-bit parallel with read forward, read reverse and a handshake line. MANY years ago I built a "BTR" (behind the reader) interface for an Allen-Bradley CNC control. Jon