From: "Pontus Pihlgren" <pon...@update.uu.se>
Sent: Tuesday, December 07, 2010 4:05 PM
To: "Ken Cornetet" <ken.corne...@kimball.com>
Cc: <simh@trailing-edge.com>
Subject: Re: [Simh] Hardware Requirements
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.
Hi Pontus,
Vince and I developed the "Blinkenlight" boards some years ago.
It uses a "Core" board with 6809 CPU and an I/O Board that has
64 digital outputs (8 LS374 latches) and 64 digital inputs (8 LS373).
It is capable of cascading up to 6 I/O Boards to one Core Board.
But the design is from 2004 or so ... have a look at this:
http://www.j-hoppe.de/PDP-11/PDP-11_70_console_panel/11_70_panel_-_Physical/11_70_panel_-_physical.html
- Henk.
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