IBM 5150 in S100?
rodsmallwood at btconnect.com
Wed Mar 30 01:06:29 CDT 2011
I dont know if this helps. I worked in VDU design and development in the
mid 1970's. The keyboards used a system with a 74150 and I think a '154.
These are a 16 line binary to decimal decode and an eight line to binary
encoder. The outputs of the one and the inputs of the other formed a matrix
with the keys (switches) at the junctions. A counter drove the inputs of one
and the selects of the other. As soon as you got an output the counter
stopped and its value became the pressed key value.
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Fred Cisin
Sent: 29 March 2011 21:58
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: IBM 5150 in S100?
The Steve Ciarcia "Micromint"? PC used a terminal as it's default console.
Its BIOS and/or I/O drivers might help as a starting point.
But, because a significant portion of their users actually wanted a "real"
5150, they came out with an ISA board for it with a 5150 style keyboard
interface. Studying that might help with building an S100 imitation of
the 5150 keyboard interface.
Grumpy Ol' Fred cisin at xenosoft.com
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