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.CO This is meant to be printed via TI-WRITER. The formatter option makes it
.CO look nicer. I've tried to make the schematics printable on any printer
.CO since I've only used the keyboard characters and not any special graphics
.CO characters which would require translations between various printers.
.CO This is NOT copywrited and is released to the public domain for the benefit
.CO of any 99/4A enthusiasts who might find it of any value. Feel free to
.CO redistribute this as you wish. Enjoy! =Jim=
.LM 0;RM 79;IN +5;FI;AD
.FO Supercart^Additions^-^McCulloch^^^^^^^-%-
.CE 4
&@ADDING^TO^YOUR^SUPERCART
(Battery^Back-up^Circuit^@and A^Second^RAM^Chip^Addition)
Jim McCulloch
1^April^1986
As almost any 99'er knows, a Supercart is a solid state command module for the
99/4A which includes an Editor/Assembler GROM chip and a battery backable CMOS
static RAM memory chip, the HM6264LP-15 by Hitachi or other makers. With this
module, you can have power-up menu access to any Assembly Language program(s)
you feel like including, as long as the total size doesn't exceed 8K.
The full instructions for the construction of the battery backed Supercart were
described very well in &MICROpendium Magazine in the June, July and August 1985
issues by its inventors, John Clulow and Ron Gries of the New Horizons Users
Group of Ohio. It has come to my attention, however, that several people have
earlier versions of the Supercart without the battery backup circuit (such as
described in one of the Ryte Data newsletters). For anyone who doesn't have
access to the &MICROpendium issues (everybody should; it's a good magazine for
us 99'ers in spite of the controversial major advertiser), this article will
describe the addition of the battery backup circuit. For those of you who
already have this most useful feature, read the next sentence. Thanks to Mark
Lopez who told me how he did it, this article also describes the construction
of a manually bank switchable module with @TWO HM6264LP-15 chips installed for
a total of 16K user addressable memory (albeit 8K at any one time). Although
much of the following may be "old hat" to many of you, it includes some
information I haven't seen distributed widely and so I naively include it so
that more of us can share any helpful information.
.CE
&PARTS^LIST
.IN +0
&PARTS^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^&QTY^^^^^&SOURCE^^^^^^^^^^^^^^^^&PRICE^^^^^
.CE
(For^the^battery^back-up^circuitry)
1N914^Signal^Diodes^^^^^^^^^^^^^^^^(2)^^^^^Radio^Shack^276-1122^^$0.99^for^10
1K^Resistor-1/4^Watt^^^^^^^^^^^^^^^(2)^^^^^Radio^Shack^271-1321^^$0.39^for^^5
2.2^MFD^Tantalum^Capacitor^^^^^^^^^(1)^^^^^Radio^Shack^272-1435A^$0.59^each
Jumbo^Red^LEDs^^^^^^^^^^^^^^^^^^^^^(1)^^^^^Radio^Shack^276-0141A^$0.69^for^^2
Lithium^3V^Enercell^Battery^^^^^^^^(1)^^^^^Radio^Shack^^23-160^^^$1.79^each
Coin-Type^Lithium^Battery^Holder^^^(1)^^^^^Digi-Key^^BH906-ND^^^^$1.25^each
.CE
(For^the^switchable^second^RAM^chip^capability)
HM6264LP-15^CMOS^RAM^IC^^^^^^^^^^^^(1)^^^^^I.C.Express^^^^^^^^^^^$2.95^each
1K^Resistor-1/4^Watt^^^^^^^^^^^^^^^(1)^^^^^Radio^Shack^271-1321^^$0.39^for^^5
SPDT^Miniature^Switch^(Center^Off)^(1)^^^^^Radio^Shack^275-325^^^$2.19^each
.CE
(General^Purpose)
Module^Top^1053555-0107^^^^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$0.36^each
Module^Bottom^1053554-0107^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$0.30^each
Module^Door^1015923-0007^^^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$0.06^each
Door^Spring^1015928-0001^^^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$0.05^each
P.C.Board^(2^sides)^1015921-0004^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$3.60^each
E/A^GROM^Chip^1015960-1204^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$3.60^each
(?C1?)Capacitor^.1UF^50V^1501701-0122^(1)^^T.I.Parts^Dept.^^^^^^^$0.14^each
Screw^1010685-0034^^^^^^^^^^^^^^^^^(1)^^^^^T.I.Parts^Dept.^^^^^^^$0.02^each
.BP
.IN +5
Radio Shack stores are generally ubiquitous. Digi-Key may be addressed at: P.O.
Box 677, Thief River Falls, MN 56701-9988 or at 1-(800)-344-4539. I.C.Express
can be addressed at: 15358 Valley Boulevard, City of Industry, CA 91746 or at
1-(800)-892-8889 ($10 minimum order). T.I. Parts Dept. can be reached at their
new (1986) phone number at 1-806-741-3064 (Credit Cards useable and get faster
response).
.CE
&Battery^Back-up^Circuit
On this page, Figure 1 shows the essential Supercart schematic.
.NF;NA
TO +5V SUPPLY
! TO EDGE CONNECTOR 3
---------------!-!------------------------------------------------------
|()% = 1 6 28 = ! %%%%o%%%%%%%%%%%%o%%%o%%%%o%%%%o%%%%%o%%%%%o%%%%%o%%%|
|%% /-= 2 2 27 =/ o oF3 %%%%%%% %%|
|%% ! o 3 6 26 o ! %o% o o o o o o o o %%|
|o% ! o 4 4 25 o C1 o o o o o o o o %%|
|%% ! o 5 L 24 o ! o o G o o o o o o o o %%|
|%% ! o 6 P 23 o F1 ! " o R o o o o o o o F2 %%|
|%% ! o 7 - 22 o o o_ \ o O o o o o o o o %o|
|o% ! o 8 1 21 o ! \ \ o M o o o o o o o RS %%|
|%% ! o 9 5 20 o__! \ \ o o o o o o o o o %%|
|%% ! o 10 19 o \ \ o o o o o o o o+5V " %%|
|%% ! o 11 18 o \ \===/=\=======/=\=======/=\=======/ / %%|
|%% ! o 12 17 o \ +5V / %%|
|%% ! o 13 16 o \ GROUND / %%|
|o% ! o 14 15 o o===========\ / %%|
|%% ! \ / %%|
|%% ! \ / %%|
|%% TO EDGE \ /=======/ %%|
|%% CONNECTOR 7 \ / %%|
|%%% \ \ " o=%%%%%%%%%%%%%%%%|
|%%%% \ \ " ! %%%%%%%%GROUND%%|
|%%%%% \ \ " ! %%%%%%%%%%%%%%o%|
|%%%%%% \ TO RAM CHIP PIN 27 \ " ! %%%%%%%o%%o%%%%%|
|%%%%%%% \--------\ ! \ " ! %%%o%%%%%%%%%%%%|
|%%%%%%%% \ ! TO RAM CHIP " o ! %%%%%%%%%%%%%%%%|
|%%%%%%%%%%%%%%%%% --- ! ------! PIN 2 "===o %%%%%%%%%%%o%%%%|
|()%o%%%%%%%%%%%%o ! ! " o%%%o%%%%%%%%%()|
------------------- " " " " " " " " " " " " " " " " " " -----------------
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
--"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"--
1 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 1 1
0 1 2 3 4 5 6 7 8
.FI;AD;LM 0;RM 79;IN +5
.CE 2
FIGURE^1
(A^Supercart^Without^Battery^Back-up)
.BP
First of all, to open a module, unscrew the screw on the bottom cover. Then
using a flat bladed screwdriver, pry the retaining lugs to be encountered in
the bottom slots outwards. If you leave the foil label on the front of the
module, it will act as the hinge of the clam shell thus formed, keeping proper
alignment. You will probably find that the spring and door assembly are located
on the top part of the module case. In some cases it's easier to reassemble the
module if the spring and door are on the bottom. If you pinch the spring
together (like a hose clamp), it will enlarge enough to fit over the larger
post on the bottom module cover and the door fits in as before.
If you have an older style Supercart without the battery back-up circuitry, you
may notice that pin 28 of the RAM chip is connected to the right hand side of
the foiled hole F3. This is the +5V supply as it is supplied from the console
via GROM port extender pin 19 (on the underside of the Printed Circuit Board).
In keeping with the &MICROpendium instructions, the foiled holes at both F3 and
F1 should be electrically separated by scraping away the connecting foil. The
C1 capacitor (the one which came installed on the board) should be moved to the
right handed holes of F3 (which is +5V from the console) and F1 (which is
Ground) if it isn't already there.
There should be a wire connecting RAM hole 20 to the left handed hole of F1 (as
well as a connector from RAM pin 20 to RAM pin 22 and a 1K resistor between RAM
pin 20 and another part of the board.) The LED has a flattened side; the wire
on this side should be connected to the left hand side of F3. This will supply
+ voltage to keep the CS2 pi of the RAM chip (pin 26) at a high voltage state
which is needed for proper operation. To this wire in the left hand side of F3,
connect one lead of a 1K resistor (R2 in Figure 2). The other end of R2
connects to any one of the Grounded foiled holes around the periphery of the
board. The lead of the LED opposite the flattened side should be connected to
any of the +5V holes available on the board; this may include the right hand
side of F3 or any of the bottom right GROM holes as shown in Figure 2.
Somewhere on the board, you should make an electrically isolated hole; if you
remove the 100 ohm reset resistor between F2 and RS, then the F2 hole is easily
available by scraping away its foil connection with the rest of the board. Into
this hole, solder a short length of stiff wire; to this terminal you will be
soldering four other connections. The first of these four connections is the
dark banded end of a diode (D1 in Figure 2); the other end of D1 is connected
to a +5V supply hole, such as at the bottom right side of the right-most GROM
socket. This will supply the +5V to activate the RAM chip and enable it to be
written to. The second connection to F2 is one end of a 1K resistor (R3 in
Figure 2). The other end of R3 should be soldered to the dark-banded end of
another diode (D2 in Figure 2). The other end of D2 should be connected to the
positive lead of the Lithium battery holder. (Soldering directly on Lithium
batteries should be discouraged since there are reports of these types of
batteries EXPLODING when subjected to heat or charging currents. The diodes in
this circuit are apparently used to prevent such currents.) The third
connection to F2 is the + lead (it's marked) of the Tantalum capacitor (C2 in
Figure 2). The other lead of the Tantalum capacitor should be connected to
any of the grounded holes around the periphery of the board. This is to
"isolate" the power source. To any of the grounded holes available around the
periphery of the board should be connected the negative lead from the Lithium
battery holder. The fourth and final connection to F2 is a wire, the other side
of which connects to Pin 28 of the RAM chip (disconnect any previous wiring
from it to F3). Wrap any exposed wiring with electrical tape to prevent short
circuits. I drilled a 1/4" hole in the front label side of the cartridge to let
the LED shine through; it's not absolutely needed for correct functioning but
it's a nice touch. @Voila, this should do it for the battery backed circuit!
.BP
.NF;NA
-----TO +5V SUPPLY (F2)---------------------------------
! TO(-)LITHIUM !
! TO EDGE CONNECTOR 3 CELL \ !
! ! TO(+) \ !
! ! ! LITHIUM \ !
! ! /-----------R2---- ! CELL ! !
! !!------LED--------!------- ! ! !
! !!(FLAT) (ROUND)! ! ! ! !
---------------!-!!-----------------!------!----------!-------------!-!--
|()% = 1 6 28 = !! %o%%%%%%%%%%% o %%o%%!%o%%%%o%%%!%o%%%%%o%%%% o !%|
|%% /-= 2 2 27 =/ o oF3 %%%%%%% ! ! -/ !%|
|%% ! o 3 6 26 o ! %o% o o o o! o o ! o o C2< !%|
|o% ! o 4 4 25 o C1 o o o o! o o ! o o +\ !%|
|%% ! o 5 L 24 o ! o o G o o o! o o !-D2|----R3--o--!%|
|%% ! o 6 P 23 o F1 ! " o R o o o! o o o o /F2 %%|
|%% ! o 7 - 22 o o o_ \ o O o o o! o o o o ! %o|
|o% ! o 8 1 21 o ! \ \ o M o o o! o o o o __! %%|
|%% ! o 9 5 20 o__! \ \ o o o o! o o o o D1 oRS%%|
|%% ! o 10 19 o \ \ o o o o/ o o o o/ " %%|
|%% ! o 11 18 o \ \===/=\=======/=\=======/=\=======/ / %%|
|%% ! o 12 17 o \ +5V / %%|
|%% ! o 13 16 o \ GROUND / %%|
|o% ! o 14 15 o o===========\ / %%|
|%% ! \ / %%|
|%% ! \ / %%|
|%% TO EDGE \ /=======/ %%|
|%% CONNECTOR 7 \ / %%|
|%%% \ \ " o=%%%%%%%%%%%%%%%%|
|%%%% \ \ " ! %%%%%%%%GROUND%%|
|%%%%% \ \ " ! %%%%%%%%%%%%%%o%|
|%%%%%% \ TO RAM CHIP PIN 27 \ " ! %%%%%%%o%%o%%%%%|
|%%%%%%% \--------\ ! \ " ! %%%o%%%%%%%%%%%%|
|%%%%%%%% \ ! TO RAM CHIP " o ! %%%%%%%%%%%%%%%%|
|%%%%%%%%%%%%%%%%% \-- ! ------! PIN 2 "===o %%%%%%%%%%%o%%%%|
|()%o%%%%%%%%%%%%o ! ! " o%%%o%%%%%%%%%()|
------------------- " " " " " " " " " " " " " " " " " " -----------------
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
--"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"--
1 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 1 1
0 1 2 3 4 5 6 7 8
.FI;AD;LM 0;RM 79;IN +5
.CE 2
FIGURE 2
(Supercart With Battery Backup Circuit)
.BP
.CE
&Adding^a^Second^RAM^Chip
This section describes how I added a second RAM chip by piggybacking it on top
of the first. However, this makes the chip pile high enough so that the module
cover will not close over it. Accordingly, I had to remove a small section of
the top module cover (about 1 by 2 cm.) right at the point where it takes a
couple of right angle turns. This is where the module narrows so that it will
fit into the cartridge slot of the console. Since the chips take up some of
this space, this "souped-up" Supercart needs to reside in a widgit or other
cartridge expander (it even works well in a GK). To do the actual cutting of
the module cover, I used an old soldering gun which had a plastic cutting tip
but I suppose anything from drills to hot wires could be used also.
The Hitachi HM6264LP-15 is a 28 pin chip of which one pin is not connected, two
pins are concerned with power supply (ground and +3-5V input),and 21 pins of
which are address and data lines. This leaves 4 pins left over which control
the functions of the chip. Pin 27 is the &WE or Write Enable pin which
determines whether the chip will be written to or read from and is controlled
via the wire connected to edge connector 3; if the voltage to this pin is in a
high state (+ voltage) then the chip's memory will be available to be read from
whereas if it is low (0 voltage or grounded) then a write to memory is
expected. Pin 26 is the CS2 pin which seems to act as a sensor as to whether
power is applied or not; if this CS2 pin is at a low (0 voltage or grounded)
state, then none of the chip's memory functions are accessable. This is why it
is fed a continuous high voltage state via the LED which is connected to the
+5V supply from the console (the left hand F3 hole connects with pin 26). Pin
22 is the &OE pin or data bus in and I'm not entirely clear as to its meaning.
However in this system, if this pin is at a high voltage state, output from the
chip is disabled and if it is at a low state (0 voltage or grounded) then read
and write functions can be done. The last of the four control pins is pin 20 or
&CS1 or chip select pin. When this pin is supplied with a high state (+
voltage) the entire chip pretends that it isn't there (it's "deselected"). When
this pin is at a low state (0 voltage or grounded) then it gets the message
that it has been "selected" by the rest of the system to converse with and its
functions are enabled. If you look at the inside of a GK or Horizon Ramdisk
which both use piggybacked 6264LP-15s, you will find pins 20 bent out with
individual wires connecting them to the board; this is the way each chip is
selected or deselected.
The above paragraph is probably boring and inaccurate but it helps to explain
the circuitry necessary to add another RAM chip to the pile. It's relatively
simple to piggyback another RAM chip on top of the first; bend in the pins to
make a tight fit over the lower chip's pins by molding on a table top, then
bend out pins 1, 2, 20, 27, and 28. Then solder the pins from the top chip to
the bottom chip being careful not to make any solder bridges between adjacent
pins. (In my module, I actually soldered the two together before I installed it
on the board.) Pin 1 is ignored. Pins 2, 27, and 28 are connected to the same
wires as supply the corresponding pins on the lower chip. If you connected all
of the pins of both chips in parallel, you would have both chips doing the
exact same thing - clones of each other. How do we give each chip its
individuality? This is where the &CS1 pins (pin 20) become useful. A "pullup"
resistor is used to supply + voltage (a high state) to pin 20 of the chip not
being used which as we read in the above paragraph has the effect of making
that chip "invisible" to the system. In the absence of such a "pullup" resistor
and + voltage source, these pins would tend to "float" down to a 0 voltage
state which would cause the system to "select" both chips at once.
This would cause the system to read the same address of
both chips simultaneously which would result in garbage and a probable crash.
In the Supercart board, there is a resistor (R1) which acts as such a pullup
resistor. In the version described for use in cartridge expanders, this R1
resistor is connected between &CS1 (pin 20) and the +5V line from the console.
This supplies a high state to deselect the chip. How then is the chip selected
to enable it to do its thing? This is the function of the wire connecting pins
20 and 22 (the &OE pin). When the &OE pin is made a low state (0 voltage) then
pin 20 is also made low since the resistor supplies voltage less readily than
the direct connection to pin 22 "takes it away". To enable us to use both chips
independently then, we could use a switch to connect the &OE (pin 22) line to
either of the RAM chips pin 20 while having pullup resistors connected to both
pins 20 to keep the other chip deselected while the one chip is working.
This is exactly what I did: disconnect any wiring between pins 20 and 22 (to be
found on the lower or older chip); next connect 1K resistors (R1 in Figure 3)
between pin 20 and the +5V line for both the top and bottom RAM chips; next run
wires from pins 20 of both the lower and upper chip to the outer terminals of
the SPDT switch; then connect the center terminal of the SPDT switch to the &OE
pin with another wire (if you're tired of soldering on chip pins by now, you
could run this wire to edge connector 2 which is the same line).
I then drilled another 1/4" hole in the front (label) side of the cartridge
(somewhere on the left hand side to keep it away from the chips) to install the
switch in. If the spring and door of the module cover have been moved to the
bottom cover, it makes it easier to insert the modified board back into the
module. Again, wrapping any exposed wires helps to prevent short circuits (in
one of my earlier efforts, smoke rewarded me when I powered up the Supercart!)
I finally used black electrical tape to wrap around the module and cover up the
hole I'd made in the top cover. @Voila, a manually switchable extra bank of
useable memory! Now I can choose between 2 different entry menu screens simply
by flipping the switch.
One other potentially useful feature I've found is this: with my previous
single banked Supercart, I would more often than not scramble the memory if I
removed the cartridge or inserted it with the console power on. (In retrospect,
this is because the chip was hardwired to be constantly selected and was
subject to transients and "spinal shock" when connected and disconnected.) Now
if I "deselect" both RAMs by placing the switch in the center position, I can
remove and insert the cartridge even with console power on without losing
Supercart contents. To run, however, one or the other of the RAM chips has to
be selected.
I hope these comments have been useful to any other "technoklutzes" beside
myself out there. If anyone has any corrections or comments to make, I'd be
pleased to get them at: Jim McCulloch, 9505 Drake Avenue, Evanston, IL
60203-1107 (CIS ID# 74766,500).
.BP
.NF;NA
&SPDT^SW
TO UPPER PIN 20-! ! !-TO LOWER PIN 20
!
TO EDGE CONNECTOR 2 (OR PIN 22)
-----TO +5V SUPPLY (F2)---------------------------------
! TO(-)LITHIUM !
! TO EDGE CONNECTOR 3 CELL \ !
! ! TO(+) \ !
! ! ! LITHIUM \ !
! ! /-----------R2---- ! CELL ! !
! !/------LED--------!------! ! ! !
! !!(FLAT) (ROUND)! ! ! ! !
---------------!-!!-----------------!------!----------!-------------!-!-
|()% = 1 6 28 = /! %o%%%%%%%%%%% o %%o%%!%o%%%%o%%%!%o%%%%%o%%%% o !%|
|%% /-= 2 2 27 =/ o oF3 %%%%%%% ! ! -/ !%|
|%% ! o 3 6 26 o ! %o% o o o o! o o ! o o C2< !%|
|o% ! o 4 4 25 o C1 o o o o! o o ! o o +\ !%|
|%% ! o 5 L 24 o ! o o G o o o! o o --D2|----R3--o--!%|
|%% ! o 6 P 23 o F1 ! " o R o o o! o o o o /F2 %%|
|%% ! o 7 - 22 o o o_ \ o O o o o! o o o o ! %o|
|o% ! o 8 1 21 o ! \ \ o M o o o! o o o o __! %%|
|%% ! o 9 5 20 o=--<\U \ \ o o o o! o o o o D1 oRS%%|
|%% ! o 10 19 o L\\P \ \ o o o o/ o o o o/ " %%|
|%% ! o 11 18 o O\\P \ \===/=\=======/=\=======//\=======/ / %%|
|%% ! o 12 17 o P W\\E \ +5V // / %%|
|%% ! o 13 16 o I E\\R \ GROUND // / %%|
|o% ! o 14 15 o N R\\ o===========\ // / %%|
|%% ! 20 \!---R1---------------// / %%|
|%% ! ! \ / / %%|
|%% TO EDGE !\-------R1---------/ /=======/ %%|
|%% CONNECTOR 7 !! \ / %%|
|%%% \ TO OUTER SPDT!SWITCH TERMINAL \ " o=%%%%%%%%%%%%%%%%|
|%%%% \ TO OUTER SPDT SWITCH TERMINAL \ " ! %%%%%%%%GROUND%%|
|%%%%% \ TO INNER SPDT SW TERMINAL\ " ! %%%%%%%%%%%%%%o%|
|%%%%%% \ ! TO RAM CHIP PIN 27 \ " ! %%%%%%%o%%o%%%%%|
|%%%%%%% \--------\ ! ! \ " ! %%%o%%%%%%%%%%%%|
|%%%%%%%% \ ! ! TO RAM CHIP " o ! %%%%%%%%%%%%%%%%|
|%%%%%%%%%%%%%%%%% \-!-! ------! PIN 2 "===o %%%%%%%%%%%o%%%%|
|()%o%%%%%%%%%%%%o ! ! ! " o%%%o%%%%%%%%%()|
------------------- " " " " " " " " " " " " " " " " " " -----------------
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
| " " " " " " " " " " " " " " " " " " |
--"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"-"--
1 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 1 1
0 1 2 3 4 5 6 7 8
.FI;AD;LM 0;RM 79;IN +5
.CE 2
FIGURE 3
(Supercart With Switch Selectable RAM Chips)
)3=GUUUUUUUU
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