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From: grr@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Stereotek glasses
Message-ID: <1461@cbmvax.cbmvax.cbm.UUCP>
Date: Tue, 24-Feb-87 15:23:55 EST
Article-I.D.: cbmvax.1461
Posted: Tue Feb 24 15:23:55 1987
Date-Received: Fri, 27-Feb-87 01:50:37 EST
References: <8702240838.AA09495@ingres.Berkeley.EDU>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Organization: Commodore Technology, West Chester, PA
Lines: 29

In article <8702240838.AA09495@ingres.Berkeley.EDU> hatcher@INGRES.BERKELEY.EDU (Doug Merritt) writes:
>[me:]
>>> Stereo Tek 3D glasses, [...]
>>>use liquid crystal shutters in lightweight glasses to present alternate
>>>screen frames to the right and left eyes, repectively, giving 3d
>>>[...]the Amiga. Anyone out there know what kind of hardware hacks might be
>>>necessary?
>
>[George Robbins:]
>>No hardware hack would be needed, just some programming to switch bit-plane
>>pointers and a control line between frames.
>
>Could you expand a bit? Where would it plug into the Amiga? And what was
>that about a "control line" ?
>	Doug

Some of the pins on "Joystick" connectors are actually programmable I/O pins
and can be used for controlling or communicating with external devices.  A
number or third-party real-time clocks already do this.

The other alternative would be to use one of the parallel port control lines,
but then there is more likely to be a conflict between the system software
and your intentions.

Consult the Hardware Reference Manual for further detail on the Joystick ports.
-- 
George Robbins - now working for,	uucp: {ihnp4|seismo|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)