On Tue, Dec 07, 2010 at 09:21:43AM -0500, Ken Cornetet wrote: > Keep in mind that the printer port on regular old PCs can be used for a few > lines of general input and output. I used to do this on a regular basis back > in the DOS days. Looks easy under linux too: > http://www.faqs.org/docs/Linux-mini/IO-Port-Programming.html
It's a solution I'm considering, but I have a concern. Besides the PDP-15 panel I also have a PDP-12 panel. The PDP-12 panel has arround 120 lights. So while I think it will be possible to control them by cascading shift registers, I'm worried it will be to slow. Having more I/O pins and narrower shift registers would speed things up. I would love to be proven wrong here, in which case I can dig out a Pentium III with parallel port and start experimenting. - Pontus. _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
