[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Unknown device plugged into internal joystick socket

Subject: Re: Unknown device plugged into internal joystick socket
From: dempson@actrix.gen.nz (David Empson)
Date: 1999/02/03
Newsgroups: comp.sys.apple2
Organization: Empsoft
References: <hud83udlf9.fsf@turing.une.edu.au>

Chris Baird <cbaird@turing.une.edu.au> wrote:

> A recently rescued IIe has a unknown device plugged into the interal
> analogue port, consisting of a 74LS04, 74LS10, and some ribbon cable
> in a yet-to-be-determined circuit.  Construction looks homemade.
> Does this sound familiar to anyone?

The LS04 is a hex inverter and the LS10 is a triple 3-input NAND gate,
so I guess this is doing some logic function with the switch inputs
and/or annunciator outputs.  Why, I have no idea.

It doesn't sound too sophisticated - no flip-flops, latches, or shift
registers, for example.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand

Follow-Ups:
- Re: Unknown device plugged into internal joystick socket
  - From: Rubywand <rubywand@swbell.net>

References:
- Unknown device plugged into internal joystick socket
  - From: cbaird@turing.une.edu.au (Chris Baird)

Prev by Date: Re: Enhanced Apple II?
Next by Date: Weird cable for Apple IIe monitor?
Previous by thread: Re: Unknown device plugged into internal joystick socket
Next by thread: Re: Unknown device plugged into internal joystick socket
Index(es):
- Date
- Thread