rbono@necis.UUCP (Rich Bono) (06/20/89)
Ok, here it is.... I have had this available for a long while, but never
had much interest in it. I even heard of one store somewhere in Florida
that was selling MY plans for a profit to themselves!
I hate to retire my Z100, if anyone wants to make me an offer, let me
know......
The instructions are fairly simple. Don't attempt this if you are not
technically able. I assume NO responsibility if you damage your system
in any way.
Z100 REMOTE KEYBOARD
***ALL RIGHTS RESERVED***
Copyright (c) February 7, 1984
Richard J. Bono
NM1D
7 Redfield Circle
Derry, New Hampshire 03038
(603)-432-9002
*** NOTE: This procedure requires some technical skill, it is not intended
to be for the beginner or those who don't understand electronic circuits. DO
NOT ATTEMPT THE FOLLOWING UNLESS YOU ARE ABSOLUTELY SURE OF WHAT YOU ARE DOING!
I assume no responsibility for any damage to any equipment, data or person.
This document will attempt to explain the procedure for converting the
"fixed" keyboard on the Z100, to a separate keyboard, as is currently in vogue.
This procedure will probably void your warranty with Heath/Zenith as it is,
after all a "user modification"; but you will see that no changes are made to
the Z100 of any kind that could not be removed to return your unit for service
(if it ever needs it) or to degrade in any way the resale value. There are no
"etch cuts" or "solder connections" of any kind required to your present
system, and in the current models, it is not necessary to drill any holes in
any part of your unit!
The procedure, put simply, consists of removing your present keyboard
(only requiring a screw-driver and a 1/4" nut driver); removing U204 (just
under the keyboard) and replacing it with another IC; removing U231 (will later
have a plug installed here); then install one small custom built board by using
existing holes in the current chassis; plug 3 cables into the Z100's main
board; install a 6 pin modular phone jack in a sheet of plastic (or metal)
painted the same color as the Z100, then mount this "plate" over the now
existing hole where the original keyboard was. The next part is the easiest,
the keyboard is now placed in an enclosure ordered from the Heath parts
department (along with a few other parts also ordered from them), then sit back
(literally), and enjoy your remote keyboard!
If you ever want to remove the "modification", just remove the "plate",
remove the custom board, replace the original IC's and keyboard, then replace
the covers. Done; and no-one should ever be able to tell that you ever had the
covers off.
The minimum parts that need to be ordered from Heath are the following:
QTY. Heath No. Description Price
1 444-123 Custom 8021 IC $7.35
1 444-122 Custom 8041 IC 9.35
1 85-2716-1 Circuit board 6.70
1 404-625 3.5810 Mhz crystal 2.90
1 473-29 Transducer 2.25
1 92-777 Key-board enclosure top 7.70
1 92-769 Key-board enclosure bottom 5.45
1 432-903 10 pin plug .80
1 432-1227 20 pin plug .95
1 434-362 Right angle socket 2.20
1 134-1209 Coiled cord (from Z29) 6.30
1 204-2662 Bracket (from Z29) 1.00
1 434-370 6 conductor connector(from Z29) 3.55
1 432-1150 8 pin socket (from Z29) .45
6 432-866 small spring connector(from Z29) .05
2 9-106 10k resistor pak 1.40
4 261-34 foot .25
1 75-204 insulator
The following are required but you may be able to buy them
cheaper from a local electronics store.
3 6-103-12 10k resistor 1/4W 5%
1 6-471-12 470 ohm
1 6-154-12 150k
1 6-224-12 220k
1 6-103-12 10k
1 6-101-12 100 ohm
2 6-474-12 470k
1 6-105-12 1Meg ohm
1 95-197 1uF tantalum capacitor
1 25-949 2.2uF " "
1 25-921 47uF " "
5 21-786 .1 uF ceramic capacitor (104)
1 21-140 .001uF " "
1 10uF 35v capacitor
5 .01uF capacitor
2 56-56 1N4149 diode (10ma, 75v)
1 443-1024 74LS368A IC
1 443-46 7402 IC
2 443-1036 74LS156 IC
1 443-727 96L02 IC
1 442-53 555 IC
1 443-872 74LS14 IC
1 250-1412 4-40 X 3/8" screw
5 250-1431 #6 3/8" self tapping flathead screw
6 250-1478 #6 7/8" self tapping
1 252-2
1 254-9
1 434-230 8 pin IC socket
2 434-298 14 pin IC socket
4 434-299 16 pin IC socket
1 434-312 28 pin IC socket
Misc. parts for the "Custom board"
1 2" X 2" "perf-board"
1 10 pin "Panduit connector" as on
the keyboard
1 20 pin " "
1 8 pin "DIP Header" to plug into U231
#18 Ga. wire
Follow the schematic to build the "Custom" board. There will be only one
IC, a resistor and several capacitors to install on this board. This is where
your knowledge of electronics and building will pay off. Good luck!
To install the "Custom" board :
1) Remove the Z100's cover.
2) Remove the disk drive tray (monitor and drive(s) on the
all-in-one).
3) Remove the upper cover to release the keyboard.
4) Remove the keyboard (unplug from P107 & P105).
5) Remove U204 (444-141) from the main board (located
just under the keyboard on the main board).
6) Install at U204 the 8041 IC ordered from Heath
(#444-122)
7) Remove U231 from the main board (just to the right of
U204).
8) Mount the "Custom" board just to the left of the main
board (there is already a hole there that could be
used with a standoff).
9) Install the 10 pin plug from the "Custom" board at
P107
10) Install the 20 pin plug from the "Custom" board at
P105.
11) Install the 8 pin DIP header at U231.
12) Fasten the 6 pin modular connector to the "plate".
13) Install the plate to the upper cover of the Z100
14) Replace the drive tray and top cover of the Z100.
15) Build the keyboard encoder circuit board **** NOTE 1.
16) Install the keyboard into the case with the encoder
circuit
17) Install the cable from the keyboard to the modular
connector.
18) Test and trouble-shoot if needed.
*** Note 1:
I recommend that you follow the instructions from the ET-100 trainer to
build this board, install the keyboard etc. All parts (except as noted) have
been ordered from this kit. The only additional circuitry (the "custom" board)
was added to make the interface between circuits originally designed for the
ET-100 and the Z100.
Comments:
This is a very simple circuit to build and install, it should increase
the comfort of using the Z100; with this "modification" you could move the
"base" unit under the desk, or on a shelf, and have nothing but the keyboard
and monitor in front of you.
Take your time and think things through, the only real trouble that you
could get into is when you install and power-up the circuit. @BE SURE YOU HAVE
EVERYTHING CONNECTED PROPERLY@ and no wires crossed; you could cause a short-
circuit and burn-up something! If you can't get the circuit working, re-
install the original parts and seek some professional help! By the way, I
recommend saving the original ICs just incase you need to send your machine in
for service, as Heath doesn't like to work on "modified" devices.
Good luck and enjoy,
Richard Bono
**released for use of members of the general HEATH/ZENITH community**
***** ALL COMMERCIAL RIGHTS RESERVED BY RICHARD J. BONO *****
*********************************************
****** Z100 Remote Keyboard Schematic *******
****** Custom Interface Board *******
****** NM1D *******
****** ALL RIGHTS RESERVED!!!!!!! *******
****** Richard J. Bono January 1984 *******
*********************************************
+
+------|(-------------------+
| 10uf |
| U231 |
| ======== |
(ground) | | 8|----+
________________________________+_______________|4 | |
/ ======== |
+---+ / +---+ |
| 1 |----+/ 74LS14 _______| 2 | Z100 main |
| 2 |----+ |\ |\ / | | board |
| 3 |-@-------------|B>o----|C>o-------------< | | P105 |
| 4 |-@------+ 3 |/ 4 5 |/ 6 \_______| 4 | (6 pins) |
| 5 |-@---+ \__ | | |
| 6 |-@-+ \ \ ~~~~~ |
+---+ \ \ \ 13 |\ 12 +----+ |
\ \ \________|F>o----------------------| 9 | |
6 pin modular \ \ |/ | | |
phone socket \ \ /| | | Z100 main |
\ \---------------o<E|------------------| 10 | board |
\ 10 \| 11 | | P107 |
\ | | (10 pins) |
\ ~~~~~~ |
\ |
\ (+5VDC) |
+-----------------------------------------------------+
Parts:
Qty. Description
1 74LS14 hex inverter IC (Heath part #443-872)
4 .01uf 10V capacitors
1 10uf 10V electrolytic capacitor,
be carefull of polarity when installing this capacitor.
1 6 (six) pin "modular phone jack"
1 10 (ten) pin "PANDUIT" connector
1 6 (six) pin "PANDUIT" connector
1 8 (eight) pin DIP header (or an 8 pin IC socket)
1 "perf-board" blank circuit board
Misc. wire solder etc.
Notes:
1) @ means install one .01uf capacitor from this point to ground,
also an optional ferrite bead (for RFI protection).
2) Connect pin 14 of the 74LS14 to +5VDC,
and pin 7 (of the same 74LS14) to ground.
3) Remove keyboard from Z100.
4) Replace U204 (444-141) of Z100 with 444-122 from ET-100.
5) Remove U231 from Z100, then plug in 8 pin DIP connector,
CAREFULL OF POLARITY!!!!!
6) Connect 10 pin "PANDUIT" plug to Z100 (P107),
CAREFULL OF POLARITY!!!!!
7) Connect 6 pin "PANDUIT" plug to Z100 (P105),
CAREFULL OF POLARITY!!!!!
--
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* Rich Bono (NM1D) If I could only 'C' forever!! rbono@necis.nec.com *
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