Letter of Explanation: For Third Party "SimmStick TM Compatible" Designers.
US Trademark Registration:
The only other consideration is that the bus design functionality be reasonably well followed to allow new designs to be readily interfaced to existing designs. This would then allow any new third party product to be SimmStick TM compatible.
This means anyone is free to make a SimmStick TM Compatible board as long as it is electrically compatible and they are free to call it such.
If designers are unsure of
any design factors, it may be wise to contact Dontronics for advice.
This registration now appears as being filed. Has taken over 2 months just for that.
Serial Number: 75/900253
(BTW Word mark (text) registration is only upper case presented.)
The full registration takes
some time. Example:
15-Jun-2000 And it has finally appeared in the US Patent & Trademark Office Database.
Do a search on simmstick
Blank PCB Patterns.
We also make available the artwork for 1" and 2" prototype boards to assist in the development of new designs. Currently this is only available in DOS Autotrax format. If users wish to contribute other formats, we will add these to the range available.
If a company was to manufacturer and sell say a 1" proto board in direct competition to the existing Dontronics one, we would consider this foul play. The same principle applies to any other existing design, so we would hope that new designs are different enough to allow current designers the appropriate financial returns on their original design.
We feel the internet has built-in self control of duplicated designs. It's really a small world in our niche market of Microcontroller board design if sales are done via the web, and any duplicated designs will stand out, which should indicate to customers that a specific board is only a copy of someone else's original work.
will get you the files in DOS Autotrax format.
Subject: SimmStick(TM) PCB design libraries
Date: Mon, 21 Aug 2000 08:17:05 +0930
From: "Arthur Clarke" <talkook@
Hi Don, attached for free distribution is a copy of SIMMSTIK.LBR for use with CadSoft EAGLE PCB layout software. Included in the ZIP is both ASCII text brief explanation and HTML explanation which also includes links to both CadSoft and Dontronics.
I have taken a small liberty with your spec in that a 2 inch SimmStick is now 2.05 inch high but still has the top holes .175 from the top edge (I really could not understand the logic of a board being 2.025 inches high when there is no 'standard' cabinet to install it in!!) I was influenced by the discrepancy on your page 'SimmStick Overview, Dimensions and Bus Pinout.htm' where 'one inch.gif' shows the board as 1.025 inch and the description says 1.05 inch!
I will also upload this zip
to CadSoft's customer download area within a couple of days unless I get
an objection first
Subject: Protel Layouts. Found them
Date: Mon, 16 Oct 2000 19:44:10 +0100
From: "John Dammeyer" <firstname.lastname@example.org
Subject: SimmStick part for Pulsonix PCB design
Date: Thu, 4 Jul 2002 21:17:56 +0100
From: "Leon Heller" <leon_heller@com>
I thought I'd let you have
my Pulsonix SimmStick symbol and part files for the web site. PSX is quite
new, and there aren't many users yet. I'll also let you have the files
for EasyPC, which has many more users. They are both from the same co.,
but PSX is a full professional product, with a corresponding price. I've
included the actual design files, rather than a library. The zip archive
contains a readme file with some notes.
Subject: SimmStick PCB for PSX
I've amended the files slightly and included an image of the PCB.
BTW, I had a look at the Eagle files, to see how they were done, and I think the pads are the wrong size; not that it matters very much. Regards, Leon
Subject: EasyPC SimmStick files
Date: Fri, 5 Jul 2002 16:24:47 +0100
From: "Leon Heller" <leon_heller@
Subject: Dimension drawing and Eagle Library
Date: Thu, 18 Sep 2003 15:39:22 -0400
From: Robert Adsett radsett from attcanada.ca
SimmStick Bus Signals.
Specifications updated slightly Feb-2000
Changes Marked In Bold
Subject: SimmStick spreadsheet
Date: Sun, 14 Jul 2002 01:21:09 +0100
From: "Leon Heller" <leon_heller@
I've created this Excel spreadsheet for my own use (it includes my CPLD SimmStick) but you might care to expand it and put it on your web site, unless you've already got something like it.
I often create a spreadsheet like this when I design a PCB for a particular bus system. The next version of the PCB software I use should be able to import data from spreadsheets, which will save a lot of time and avoid errors.
Thanks Leon, that is a great idea, I'll add it to my info page and invite others to build on it, and hopefully users will get good use out of it.
NOTE **** All SimmSticks
use a board thickness of 1.26mm, or .05 inches.
Please Note In the picture above, the words "offset .25" to the right.", should read "offset .025" to the right."
The 30 edge connector Pads
are .07" wide by .08" long.
A DT Series .5" SimmStick is .6" high and has no top set of holes.
A DT Series 1" SimmStick is 1.05" high and has no top set of holes.
A proposed DT Series 1.5"
SimmStick is 1.55" high and has the top holes .175" from the top edge.
A DT Series 2" SimmStick
is 2.025" high and has the top holes .175" from the top edge.
A DT Series 2.5" SimmStick
is 2.65" high and has the top holes .175" from the top edge.
A proposed DT Series 3" SimmStick
is 3.2" high and has the top holes .175" from the top edge.
My board manufacturer has a large panel size of 14.6 inches by 16.6 inches, and this is what I size all my SimmStick boards to.
Each board must have .1 of an inch distance around the edge to the next board or the border of the panel, to allow for tooling.
DT003 board measures 3.95 Inches by 2.675 Inches. This will give 20 boards
per large panel.
Simm Socket Footprint:
Simm Socket Mating Cycle Endurance:
Re: simm sockets, etc.
I have used the DT101 and
DT001/DT003/004 for a number of projects. One I remember had a DT003
connected to a number of periherals with a 16F84 on a DT101 SimmStick.
I continually modified and expanded on what it could do
Never a hickup and examination
of the sockets/contacts shows no appreciable wear. The advantage of the
DT101 socket is that it is pressed together with no sliding (read scraping)