DT204 Expansion Board for the SimmStick™ Bus
Add four slots to the SimmStick bus, or create a patch-panel of bus signals.
Features
- Can be used just to add 4 slots to a bus. The bus continues through.
- Used as a right angle or left angle bus connection, so that you can have
a SimmStick facing up or down, or both.
- Signal Isolation and cross connection using either links or DIP switches.
- Convert Simm connector to 30 pin Female.
Schematic?
Not required as the 30 input signals simply connect to the 30 output signals.
Assembly & Parts
1 x DT204 PCB
1 x Right-angle Male connector
1 x Right-angle socket
Used just to add 4 slots to a bus and have the bus continue through.
- Solder a pair of Dual 30 pin Simm Sockets on the component side of the
board.
- Solder a 30 pin right angle male connector to the input (SimmStick Bus
end)
- Solder a 30 pin right angle female connector to the output.
You could plug it into a Simm Socket if you wish to leave the male pins off,
as it is a SimmStick device in itself.
Configurations Options
Used as a right angle or left angle bus connection, so SimmSticks face up,
down, or both.
Want to fit a ZIF socket to a SimmStick, or turn a SimmStick at 90 or
180 degrees to the normal?
Single or Dual Simm Sockets can be soldered on either the component or
solder side of the board to suit your requirements. You can solder a right angle
female 30 pin header socket on the output of the board, and make up a 30 pin
male to a single row 30 pin Simm Socket just by soldering the two components
together. This means you can have left, right, and extension boards all made
from the DT204 Expansion board.
Signal Isolation and cross connection using either links or DIP switches.
If you wish to use the DT204 for this task, you must cut all the tracks on
the component side of the board. Strange statement?, YES. There are 29 tracks in
a straight row with one track missing. This is pin 9, which is the ground pin.
This track is run on the solder side of the board and is always connected. This
set of track cuts lines up with J2 on the overlay and runs along where the
dotted line on the overlay is. There is also arrow markings on the component
side of the board.
Once the 29 tracks have been cut, they must be re-joined in one of two
ways.
- Solder a 2 by 30 set of male header pins into position J2, right above
your track cuts. These can then be re-linked with standard test links or
shunts.
- Solder in DIP Switches as indicated on the overlay. An 8 position Dip
Switch will fit above signals 1 to 8. Pin 9 (GND) may be left blank, and
another 8 position switch above pins 10 to 17, and another above 18 to 25.
This leaves 5 signals remaining.
If you are only using an 18 pin device, then this will do fine. If not,
then you need to find a 5 position (or 6 if you cover pin 9 even though it
isn't isolated) DIP Switch. These are around, but may be difficult to
find. Certainly a 4 position can be got, so you may have to fit a set of
male pins to the last position, signal D15, or pin 30.
- Solder a strip of 30 male pins into position J1, and another into J3.
These pins are used to jumper around the now isolated bus.
You may find test clips, female jumper leads, or wire wrap as suitable
methods of re-joining and cross connecting your projects input/output signals.
Convert Simm connector to 30 pin Female.
Really covered above in most configurations. You just solder the set of 30
right angle female pins to the output of the board. Again you can make up a 30
pin straight male to a single row 30 pin Simm Socket just by soldering the two
components together, so that you have an Extender board, just like in a PC. This
will also allow ZIF sockets to be installed, or the board to be logically probed
front and back, as it will now be above the other boards.
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