Sprague.Wbst311@XEROX.COM (04/04/91)
I found a place to get some STD Bus cards cheap. Problem is that I don't know anything about the STD Bus. Can anyone give me any information on them? Specifically, how many pins are on the bus, and what are they designated as? Thanks!! ~ Mike NS mail: Sprague:Wbst311:Xerox Internet: Sprague.Wbst311@Xrox.Com
bsb@hp-lsd.COS.HP.COM (Brett Baumberger) (04/13/91)
STD bus was designed around Intel 8085 bus signals. That gives you the following signals: A0-A15 for 64k of memory; D0-D7 8 bit data bus IO/M* select between memory or I/O a couple of interrupt lines reset clock Notice I show a de-multiplexed Address/Data bus. De-multiplexing is performed on the processor card. This enabled Motorola-based processors to implement STD as well. I forgot to mention R/W in the signals above. I once designed and implemented a system based around STD for an unnotable government subcontractor. It worked, it was cheap. It was easy to replace parts if needed. It was modular, which is one of STD's design goals. Just take a cpu card, add enough memory cards for your app, add I/O. Complete system.....Just add firmware. Brett Baumberger