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- From: Jim_Johnson@abcd.Houghton.MI.US (Jim Johnson)
- Newsgroups: comp.sys.atari.8bit
- Subject: Re: Function Keys
- Distribution: world
- Message-ID: <Jim_Johnson.05rh@abcd.Houghton.MI.US>
- Date: 21 Jul 92 07:56:56 EST
- Organization: Amiga BitSwap Central Dispatch
- Lines: 85
-
- In a message dated Mon 20 Jul 92 16:07, Jeff Mcwilliams <jjmcwill@mtus5.bit
- wrote:
-
- JM> Someone asked for me to post the 1200XL function key upgrade
- JM> modification for XL/XE computers, so here it is.
-
- JM> This is from Michigan Atari Magazine, October 1987.
- JM> By Charles Cherry, reprinted from ABACUS, August 1987.
- [text edited]
- JM> I was reading a letter to the Editor of Current Notes (the newsletter
- JM> of the Washington, D.C. area users) from Roger Tolbet of Ozark,
- JM> Alabama. It seems he grafted a 1200XL keyboard into an 800XL and
- JM> discovered the 800XL operating system supports the 1200XL function
- JM> keys! "So what," I hear you say. "No one ever wrote any software
- JM> for the function keys." True. But the function keys do some pretty
- JM> interesting things all by themselves. Like controlling the cursor.
- JM> No more holding down the control key. I immediately opened my
- JM> brother's 256KXL (formerly an 800XL), drilled four holes in it for
- JM> push buttons, and wired them in.
-
- JM> It works like a charm. This is something I have to have. Guess
- JM> what. It works on my 320XE (formerly a 130XE) too. Here's how to do
- JM> it.
-
- JM> Get four normally open push button momentary switches (Radio Shack
- JM> 275-1547 -- $2.69 for 4). Decide where you want to put them. I put
- JM> them in a diamond shape above the CONSOL keys of my brother's XL. I
- JM> put them on the side of my XE. Open up your computer and take off
- JM> the metal RF shield. Install the buttons. Find U24 and U25 on the
- JM> XL. I don't know the chip numbers on the XE, but they are easy to
- JM> find. They are 16 pin chips and are near where the keyboard
- JM> connector attaches to the motherboard. They should say 4051
- JM> somewhere on them. Use the one closest to the front of the computer
- JM> as U25 and the one behind it as U24. Wire the buttons as follows:
-
- JM> Button U24 U25
- JM> Up 1 4
- JM> Down 12 4
- JM> Left 1 5
- JM> Right 12 5
-
- JM> [I did this on a 600XL, and moved from pin 12 to pin 13 on U24 to
- JM> make it work... Jeff ]
-
- JM> (each button connects to both chips. One contact connects the
- JM> indicated pin on one chip, the other contact connects to the
- JM> indicated pin on the other chip.)
-
- JM> This is a real easy project and the rewards are great. I encourage
- JM> you to try it.
-
- JM> [ See either the 1200XL addendum to the Atari 400/800 Technical
- JM> Reference Notes, or the revised edition of Mapping Atari for details
- JM> on what the function keys do. In Mapping the Atari, see the XL/XE
- JM> Appendix under memory location 96 and 97.
-
- Additional notes from Jim Johnson:
- A couple things... First is that the keyboard decoder chips are sometimes
- reversed on some motherboards - if you find the above connections don't
- work, simply reverse the connections.
-
- The suggestion for mounting the switches in a diamond shape is an excellent
- one - it's what I did when I installed my 1200XL function keys on my 320XE
- several years ago; it is much easier to remember which function key moves
- the cursor in which direction. Also, I would suggest that you NOT mount
- the keys directly on the case. I mounted them to a small square pill box
- and used velcro to attach this box to the lower right corner of the case. A
- small ribbon cable looped down through the case halves to the keyboard
- decoder chips. By doing this I could open up the case for repairs without
- having wires connecting me to the case top.
-
- By the way, Innovative Concepts in Warren Michigan sells a modification kit
- for the Atari 10key pad and the deluxe version also includes the function
- keys. The kit guts the 10key pad and attaches it to the keyboard decoder
- chips the same way as the function keys - the result is a 10key pad that
- requires NO drivers and works with ALL software. In essence the keys are
- simply wired in parallel. You wouldn't believe how much easier this is when
- you have to do extensive numeric entry such as spreadsheets or DATA
- statements.
-
-
- -- Via DLG Pro v0.992
-
- Jim Johnson-
- *** Remember, they're only tools - Not a way of life! ***
-