Current Bus
Pinout

New Bus
Option 1
Can we improve on the existing design?
Option 2
Option 2 Pinout
Option 3
Option 3 Pinout

Make it Simple

DonTronics MicroBus (DTMB)

7-Oct-2002 
A new proposal by Carl Dietz

6-Sep-2002
Please Note *** Since writing this page, I seem to have more support for leaving things as is, so for the time being, SimmStick will remain in the current popular format

Please Note *** We have thousands of sockets in stock, which will keep us going for a few years to come, and we should be able to get more, so there is no way we are even contemplating dropping SimmStick at this stage.

What is wrong with the existing bus?

As each year passes by, the 30 pin simm socket becomes a little harder to source, and eventually it may kill the form factor unless we consider changing direction at some stage. This needs to be done in such a fashion that the existing SimmStick SimmBus is fully supported. This means complete integration of the old bus easily into any new bus design.

Existing boards have to be 1.26mm (.05") thick to allow for the simm socket requirements. I feel this is suppressing potential new designs, as special board sizes aren't readily available from most board manufacturers, however I personally love the board thickness for global shipping.

What is the alternative?

Forget the Simm Socket, and just use male/female header pins. All boards will remain useable with the exception of the dt208 fat to skinny converter board. The change can be phased in over a period of time without any real drama. So what has changed? Nothing really, just drop the sockets, and use the male/female pins.
See simcon.html

Existing SimmStick Bus Signals. 
Specifications updated slightly Feb-2000
Changes Marked In Bold
 

PIN #	Name	Description
1	A1	Special IO
2	A2	Special IO
3	A3	Special IO or Negative Supply
4	PWR	Unregulated DC (VPP) 7.5 to 18 VDC
5	CI/A4	Clock In/Special IO Note 1
6	CO/A5	Clock Out/Special IO Note 1
7	VDD	+5V In or Out  +/- 5%
8	RES	Reset In or Out. Active Low.
9	GND	Digital Ground
10	SCL	I2C Clock or IO
11	SDA	I2C Data or IO
12	SI	Serial In or IO
13	SO	Serial Out or IO
14	IO/A6	Special IO
15	D0	General Purpose IO
16	D1	General Purpose IO
17	D2	General Purpose IO
18	D3	General Purpose IO
19	D4	General Purpose IO
20	D5	IO/MOSI or SPI Master Out Slave In Note 2
21	D6	IO/MISO or SPI Master In Slave Out Note 2
22	D7	IO/SCK or SPI ClockNote 2
23	D8	General Purpose IO
24	D9	General Purpose IO
25	D10	General Purpose IO
26	D11	General Purpose IO
27	D12	General Purpose IO
28	D13	General Purpose IO
29	D14	General Purpose IO
30	D15	General Purpose IO

Can we improve on the existing design?

Mick suggested a 64 pin design as 64 pin IDC headers and box connectors are readily available. He believed going to another larger memory module size would only put off the same inevitable problem of sourcing sockets in future, and complicate things as we moved along. 

72-pin or 168-pin DIMM format could be fine now, but like all these ideas, the sockets may eventually become obsolete, just like the 30 pin ones are becoming right now.

I just spent several hours going through many electronic catalogs, and I found that up to 50 pins in headers, connectors, boxed pins, etc., can be found, but 64 is a little more difficult to source. However 60 pin connectors are quoted in several catalogs, and the open pin design like we have been using in the past, are cheap and readily available also. Perhaps the last block of 4 pins can be "user defined". This way, a 60 or 64 pin header could be used.

64 pin connectors, two rows of 32. 

For the sake of a name for the new bus, let's call the old bus DTMB-1 and the new bus DTMB-2. 
(DonTronics Micro Bus)
I am open to any name suggestions, as I am still struggling to get the SimmStick trademark registered in the US, having spent many years, and many dollars, I still haven't got a result. I'm not sure I want to throw another big lump of money at this problem at this stage.

Option 1:
A New Motherboard keeping the SimmStick format completely intact.

Have a look at the existing DT005 motherboard.
Imagine this with say six by 32x2 straight female connectors mounted along the board to accommodate both bus standards, at perhaps .75" centers instead of the existing simm sockets. 

Any plug in card will have a right angle male connector on it, so that all boards sit at 90 degrees to the motherboard.

At each end of the board, there will be provision for joining boards together with 32x2 right angle connectors.

The input R/A male connector position will need the signals crossed over from the left row, to the right row on the printed circuit board, to allow correct signal connection, and the output connector would be simply a R/A female 32x2 connector, which will allow input and/or output to be plugged into either a DTMB-1 bus, or a DTMB-2 bus.

This will allow the DTMB-1 (SimmStick compatible), and  DTMB-2 busses to be transferred through the new motherboard.

Plug in cards may have 30 pins on 1" modules, and 64 (2x32) pins on 2" and greater size modules.

Option 2: 
A New Pinout, new Motherboard, and two new  mini-motherboard/converter boards.

40/60/64 Pin Header:
 

Pin	Name	Name	Pin
2	x	A1	1
4	x	A2	3
6	x	A3	5
8	x	PWR	7
10	x	CI/A4	9
12	x	CO/A5	11
14	x	VDD	13
16	x	RES	15
18	x	GND	17
20	x	SCL	19
22	D6	SDA	21
24	D7	SI	23
26	D8	SO	25
28	D9	IO/A6	27
30	D10	D0	29
32	D11	D1	31
34	D12	D2	33
36	D13	D3	35
38	D14	D4	37
40	D15	D5	39
42	x	x	41
44	x	x	43
46	x	x	45
48	x	x	47
50	x	x	49
52	x	x	51
54	x	x	53
56	x	x	55
58	x	x	57
60	x	x	59
62	U/D	U/D	61
64	U/D	U/D	63

 

Old SimmStick pins in the same position as before.

Old SimmStick pins into the new positions, within a 40 pin format.

Signals to be named.

U/D (4 positions) reserved for "User Defined".

New Motherboard, and two new  mini-motherboard/converter boards.

New Motherboard
The new motherboard will basically be the 64 pin bus equivalent of the DT005 however it will use 64 pin female straight headers instead of Simm Sockets.

New mini-motherboard/converter boards.
The two new mini-motherboard/converter boards, will fit on the board space of a 2" SimmStick.

30 pin to 64 pin mini-motherboard/converter board.
The first board will have provision for a 30 pin R/A male input, one Simm Socket (or female headers), two 64 pin female headers, and one 64 pin R/A female header output.

64 pin to 30 pin mini-motherboard/converter board.
The second board will have provision for a 64 pin R/A male input, two 64 pin female headers, one Simm Socket  (or female headers) and one 30 pin R/A female header output.

New Pinout, new Motherboard.

I have taken the liberty of quoting the recent words of Lars Wictorsson of Lawicel.com, my good friend and Swedish dealer.

I would suggest a new bus (if there should be a new bus)  with no backward compatibility. i.e. on the standard mother board, do not place the SIMM30 connector, instead the user could make a cable etc. from the new bus into a special motherboard for these purposes, where the 2-4 ea SIMM30 sockets are. So 2 new motherboards, one with new design where no sign of the old is shown and one for compatibility usage. Then you do not have to mix signals as you have, instead think in new directions.

Then the problem with all busses, they intend to be noisy and sensitive to noises (electrical EMC/EMI), so I see no use for them in professional designs here, since they hardly could meet the EC rules unless 4-layer designs are used. So, this can only be treated as hobby usage!

The current design SIMM30 holds the boards nicely for vibrations and other things, there must be a way to connect the boards in the new design which hold them straight and in place.

I have seen nice bus systems which are not vertically attached i.e. in 90 degrees to the motherboard, instead there is no motherboard unless you want one. instead you stack the boards like sandwiches on top of each other (similar to PC104) and that leaves a much tighter design and stable plus is better for EMC/EMI. Problem is to find a good solution to have one connector for going down to the board below and one for going up to the board above, but that could be done with IDC connectors just beside each other.

Maybe look more widely and find a case/housing which will suit the new bus mother board and the other boards, so it can be used professionally and not just on the bench.

Actually today, parallel busses are not so common. i.e. when you have a CPU (40pin) you want those signals you have there to go to some peripherals such as I/O and nothing else, so there is no need of pulling all these lines to other places and create antenna effect, the only interested signals to have on a bus is actually different
power supplies (3/5/12V etc.), reset some shared I/O and SPI+I2C, then all I/O on the CPU is taken care of on the board where the CPU is or pulled to the other end with a connector of it's own which in return could go down to another board if needed. But the bus remains a separate bus. The only way a parallel bus is if it contains
data/address and decode signals. With a SimmStick alike bus where all MCU signals are pulled down on the bus, it gives the user only a certain maximum expansion, since the signals on the bus can only be used for just one purpose.

Just some wild thoughts I can think of right now. I'm not so fond of the IDC connectors unless they are stacked as sandwiches.

At this stage, I am very open to any suggestions on any new connectors, or pinout configurations, as all that is really needed to get from a Standard Simm Bus to any new format is one single adapter board with suitable connectors each end.

What has a reasonable number of pins, and is a very common connector?

The standard IDC 40 pin header is used on almost every PC hard drive, floppy drive, CD rom drive, and comes in a variety of male/female connectors, with ejecting, and/or locking tabs.

A set pattern of holes in boards, would allow sandwiching or stacking of boards if required.

And if we were to be a little cunning about this and incorporated the existing Simm Bus pattern, then perhaps the hurdle is overcome. I don't see the need to change just for change sake. The current Simm Bus pinout has served us well for about 7 years now. it's just the sockets and board thickness that is the problem.

Best I explain what I have in mind in the way of a pinout, and we can take it from there.

40 Pin Header with potential expansion to larger sizes:
 

Pin	Name	Name	Pin
2	x	A1	1
4	x	A2	3
6	x	A3	5
8	x	PWR	7
10	x	CI/A4	9
12	x	CO/A5	11
14	x	VDD	13
16	x	RES	15
18	x	GND	17
20	x	SCL	19
22	D6	SDA	21
24	D7	SI	23
26	D8	SO	25
28	D9	IO/A6	27
30	D10	D0	29
32	D11	D1	31
34	D12	D2	33
36	D13	D3	35
38	D14	D4	37
40	D15	D5	39
42	F/E	D6	41
44	F/E	D7	43
46	F/E	D8	45
48	F/E	D9	47
50	F/E	D10	49
52	F/E	D11	51
54	F/E	D12	53
56	F/E	D13	55
58	F/E	D14	57
60	F/E	D15	59
62	F/E	F/E	61
64	F/E	F/E	63

 

Old SimmStick pins in the same position as before.

Old SimmStick pins into the new positions, within a 40 pin format.

Signals to be named.

F/E = Potential "Future Expansion".

New Motherboard, and two new  mini-motherboard/converter boards.

New Motherboard

Current SimmStick boards are 3.5 inches long.
If we were to make the new bus width 3.5", then this will match up nicely with the board size.

There is enough room on this size card to place a 64 pin connector, (32x2) and have the pins line up with the current pins. That is, pin 1 to pin 1.

Using the above pinout table in conjunction with a new motherboard, it will mean if you wish to install a standard SimmStick, you put a 30 pin (or 32 pin) female header into the pin one position of the socket on the motherboard. 

If you wish to install a new card, you install a 40 pin (2x20) female header, pin 1 into pin 1 of the motherboard. Each of the 10 signals D6 to D15 will appear in two locations on any socket position.
Example: D6 Pin 41 and D6 Pin 20 are joined together.

If you wish to install either a SimmStick or new card into this motherboard, you can install a 60 or 64 pin female header.

The old SimmStick socket mounting holes could be aligned so they sit at the same height for both old and new boards. 

Jumpering between boards could be done with R/A 64 pin male/female headers, and this would allow a Simm Bus also to connect to the input or output of this new board via the 64 pin arrangement, or by using existing 30 pin connectors.

New mini-motherboard/converter boards.
The two new mini-motherboard/converter boards, will fit on the board space of a 2" SimmStick.

30 pin to 64 pin mini-motherboard/converter board.
The first board will have provision for a 30 pin R/A male input, one Simm Socket (or female headers), two 64 pin female headers, and one 64 pin R/A female header output.

64 pin to 30 pin mini-motherboard/converter board.
The second board will have provision for a 64 pin R/A male input, two 64 pin female headers, one Simm Socket  (or female headers) and one 30 pin R/A female header output.

I imagine putting the extra 10 signals to special I/O use, a second Uart port, 3.3V supply, etc.

Any extra standard I/O signals may well need special headers on the boards to carry these signals to the I/O circuitry directly, instead of using the big parallel bus principle.

With the 40 pin header system, it means, if you need USB, you plug a suitable card in that has been designed for the 40 pin bus system. Mind you, with all the power and special I/O, plus the new signals in the first group of 28 (2x14) pins, you don't need to necessarily build any new card 3.5 inches long, unless you need the support of a 40 pin connector that may have locking tabs.

Perhaps what Lars said above has some merit:
"A good solution to have one connector for going down to the board below and one for going up to the board above, but that could be done with IDC connectors just beside each other".
(No motherboard at all.)

Make it simple, and take the advice that has been given to you to date.
Design a new bus and motherboard using 40 pin female sockets. (2x20) Provide input and output connectors so mother boards can be easily joined, or cascaded together.
Have two holes that line up with each end of the socket of the motherboard. That is, four holes per socket.
Have two holes in each card that line up with the motherboard holes. These will be similar to the existing locking tab holes on SimmSticks.
If required, use two plastic cable ties to fasten each card into each socket on final assembly.
Think of a bus pinout, possibly the above 40 pin layout will suit, with the addition of 10 new signals to be named.

Make a simple 30 pin SimmBus to DTMB adapter. This will have a 30 pin R/A male input to a 40 pin (2x20) pin female R/A output. This will allow the Simm Bus to plug straight into the DTMB with a small PCB with two connectors attached.

I will have sets of 64 pin (32x2) headers in stock in about a month. 4 types, Male/Female, R/A, Straight. These are the kitsrus.com type, open black connectors. Same manufacturer as the 30 pin ones seen at: simcon.html

I can easily get 40 pin also, which I may do.

Before I write "At war and peace with SimmStick", best I get some constructive feedback and see what users want and need.

Hello Don,
I am working on scale R/C model warships, and am trying to build my own control systems.  I have already decided that your SimmStick(TM) module  approach was the best way to go, as I could plug in only the modules I need for a given ship.  I plan to make modules for controlling servos,  DC motors, stepper motors as well as adding ultrasonic ranging, digital compass, and even pressure sensors and inclinometers for the model sub I want to build someday.  It will probably take me a couple of years to 
get all this built and working, since I have so little spare time.  To make things easier, I am focusing only on two CPUs, the ATmega128  and the ATmega8, which have the horsepower and features to meet my needs.  However, the 64pin ATmega128 doesn't fit well with the existing SimmStick(TM) module limitation of 30pins.  I'm therefore very interested in seeing an new, expanded DTMB bus.

I read your thoughts on a new DTMB bus that you posted on your website. 
If I may say so, I believe you addressed the concerns admirably, especially the issue of the PCB thickness.  As I plan to prototype my own PCBs before paying to have nice ones made, the 0.05" thickness of 
the SIMM board is a real problem for me.  Don't get me wrong, the DT208 is a great help with this (I've already ordered two of them), but it is not an ideal long-term solution.  I know people have given you feedback saying not to change, and I know my feedback is late in coming.  For that I apologize.   But I really would like to see an expanded DTMB-2 bus solution.  To that end, I have come up with my own proposal which I'd like to ask you to read and critique.  If you decide its not worth it for Dontronics to pursue it, that's OK.  I'll still pursue some version of it for my own needs.  I just thought it would be nice if I could share my ATmega128 board designs with others using SimmStick(TM) modules.  The proposal is 
attached to this email.  I welcome any and all feedback, even if you flat out think the proposal is stupid and never want to pursue it yourself.
Many thanks,

Carl

dietzer at austin.rr.com
cdietz at fpt.fujitsu.com

A Proposal for a New DTMB-2 Bus (Dontronics Micro Bus)

The DTMB-2 bus was born out of desire to expand the original 30-pin
SimmStick(TM) bus, also known as the DTMB-1 bus, commonly used for PIC
and Atmel microcontrollers with 40 pins or less.  There are several
reasons for updating/replacing the SimmStick(TM) bus: 

    1. The 30-pin SimmStick(TM) is too small for microcontrollers with
           40 pins or more, especially the new 64-pin devices like the
           Atmel ATmega128.

    2. Each year it is harder to find sources for 30-pin SIMM connectors.

    3. The 30-pin SIMM sockets require a 0.05" thick PC board, which are
           also hard to find sources for.

I believe that the new DTMB-2 (Dontronics Micro Bus) should have the
following features:

    1. Like the SimmStick(TM) bus, the new bus should support both a
       card-edge connection and 0.100" header connection.  The card-edge
       connection must work with 0.062" (1/16") PC boards, eliminating the
       problems caused by the 0.05" thickness of SIMM boards.

    2. The new bus must be fully backward compatible with the SimmStick(TM)
       bus.  It must not only support the same signals on the bus, but be
       able to physically interface with existing SimmStick(TM) modules and
       motherboards.  The purpose of the new DTMB-2 bus is to expand and
       enhance the SimmStick(TM) bus with a standard that is easier to 
       support over time, not to eliminate the SimmStick(TM) bus outright.

    3. It should support an optional external memory interface, compatible
       both the ATmega series and the PIC17CXX series of parts.  Such an
       interface would require 19 pins, most of which could be used as
       general purpose I/O if the user does not need an external memory
       interface in his design.

    4. It should add a new power pin called VCC, which is dedicated to 3.3V.
       This will allow newer designs to take advantage of the lower voltage.

    5. Should be expandable in the future without sacrificing SimmStick(TM)
       compatibility, or compatibility with itself.

I believe the following proposal for the new DTMB-2 bus satisfies all the
above requirements.  I believe it maintains not only full compatibility
with the SimmStick(TM) bus, but allows boards designed for the new bus to
mate with existing SimmStick boards.

I propose the following definition for the DTMB-2 bus:

    1. The DTMB-2 bus would use the common 60-pin PCI card-edge connector,
       for the following reasons:

       a) The PCI bus, commonly used in PCs, will be around for quite some
          time.  The older PC and PC-AT buses can still be found on many PCI 
          motherboards, nearly 15 years after the introduction of the PC bus.
          I believe that the PCI connector will have similar longevity.

       b) The PCI card-edge connector supports 0.062" (1/16") PC boards.
          These board thicknesses are available from all PCB suppliers.
          This board thickness also allows the use of common 1/16" board
          guides to provide vertical support for taller DTMB-2 modules.

       c) The 60-pin connector provides an additional 30 pins to the
          existing SimmStick(TM) bus.  This gives better support for CPUs
          with 40 and even 64 pins.

       d) There also exists a 92-pin PCI connector, which is an extension
          of the 60-pin connector.  A board designed for the 60-pin PCI
          connector will plug into the 92-pin connector.  The 92-pin 
          connector can be used for expanding the 60-pin DTMB-2 bus design
          in the future to a 92-pin design while maintaining full backward
          compatibility with both 60-pin DTMB-2 and 30-pin SimmStick(TM)
          buses.

       e) The 60-pin PCI connector is only 3.34" long, which is actually
          shorter than the 3.8" 30-pin SIMM connector.  Thus the 60-pin
          PCI connector allows a DTMB-2 module to be 3.5" long (or less),
          basically matching the footprint of a SimmStick(TM) module.

    2. The DTMB-2 bus supports the use of dual-row headers, 2x30 (or even 
       2x32 if that is more available).  Careful assigning of the bus
       pin-out will assign the original SimmStick(TM) bus to one 30-pin
       row of the new 2x30 header, allowing the user to plug SimmStick(TM)
       boards into the new DTMB-2 module.  This would even allow the use
       of a DT208 fat to skinny converter board to allow plugging a DTMB-2
       module into a 30-pin SIMM socket !

       As an option, the DTMB-2 module may add a single row 30-pin 
       header on the top edge of the board, duplicating the new 30 pins
       of the DTMB-2 bus and use either a single row or dual row header
       on the bottom edge of the board for the SimmStick(TM) signals.
       This would allow stacking of DTMB-2 modules for users who prefer
       stackable modules to the motherboard/daughterboard approach.

    3. The DTMB-2 bus adds support for an external memory interface,
       consisting of 19 pins, which can be used by both the 8-bit external
       memory interface of the Atmel AVR series and the 16-bit external
       memory interface of the PIC17CXX series of parts.  This requires
       three control pins, called *RD/*OE, *WR/A0, and ALE/A7 (where the *
       denotes an active-low signal) and 16 address/data pins, AD0-AD7
       and AD8/A8 - AD15/A15.  Modules that use the external memory
       interface will be called DTMB-2EM modules, where the EM stands
       for External Memory.

       Although the DTMB-2 bus supports both the 8-bit Atmel AVR and
       the 16-bit PIC 17CXX external memory interfaces, you can NOT
       use both 8-bit and 16-bit DTMB-2EM modules simultaneously.
       This is due to the 8-bit Atmel external memory interface using
       A8-A15 as an output-only bus, which would cause drive conflicts
       with AD8-AD15 on the 16-bit PIC17CXX series external memory
       interface.

       If the user does not wish to use DTMB-2EM modules in his design,
       then pins *WR/A0, ALE/A7, AD0-AD7 and AD8/A8 - AD15/A15 can be
       used for general purpose I/O.  The pin *RD/*OE, however, will be
       reservered, with the requirement that it be tied high through a
       pullup resistor and be jumpered so that it can be disconnected
       from the CPU.  Then if a DTMB-2EM module is plugged into a DTMB-2
       bus with modules that use the same pins as general-purpose I/Os,
       the DTMB-2EM module can not drive out on pins AD0 - AD7 and
       AD8/A8 - AD15/A15 and thus prevents drive conflicts from occuring.

    4. The DTMB-2 bus adds a new 3.3V VCC pin.

    5. The DTMB-2 bus adds two new serial I/O pins called SI2 and SO2 for
       CPUs with two serial ports.

    6. The DTMB-2 bus adds 8 new general purpose I/Os, called B0-B7.

    7. The DTMB-2 bus interleaves the original 30 SimmStick(TM) bus
       signals with the other 30 DTMB-2 signals.  This supports using
       one row of the dual row header as a regular SimmStick(TM) header.
       It also makes it easier to support both PCI and SIMM connectors
       on the same motherboard.

    8. DTMB-2 PINOUT 

SimmStick(TM)   DTMB-2(TM)
-------------------------------
 1 A1            1 A1
                 2 *RD/*OE
 2 A2            3 A2
                 4 *WR/A0
 3 A3            5 A3
                 6 ALE/A7
 4 PWR           7 PWR
                 8 VCC (3.3V)
 5 CI/A4         9 CI/A4
                10 SI2
 6 CO/A5        11 CO/A5
                12 SO2
 7 VDD          13 VDD (5V) 
                14 B0
 8 *RES         15 *RES
                16 B1
 9 GND          17 GND
                18 B2
10 SCL          19 SCL
                20 B3
11 SDA          21 SDA
                22 B4
12 SI           23 SI
                24 B5
13 SO           25 SO
                26 B6
14 IO/A6        27 IO/A6
                28 B7
15 D0           29 D0
                30 AD0
16 D1           31 D1
                32 AD1
17 D2           33 D2
                34 AD2
18 D3           35 D3
                36 AD3
19 D4           37 D4
                38 AD4
20 D5/MOSI      39 D5/MOSI
                40 AD5
21 D6/MISO      41 D6/MISO
                42 AD6
22 D7/SCK       43 D7/SCK
                44 AD7
23 D8           45 D8
                46 AD8/A8
24 D9           47 D9
                48 AD9/A9
25 D10          49 D10
                50 AD10/A10
26 D11          51 D11
                52 AD11/A11
27 D12          53 D12
                54 AD12/A12
28 D13          55 D13
                56 AD13/A13
29 D14          57 D14
                58 AD14/A14
30 D15          59 D15
                60 AD15/A15
 

    9. DTMB-2 Connector Sources

       One source for the 60-pin PCI connector is Digi-Key,
       part# 145154-4-ND.  The connector is made by Amp/Tyco
       Electronics, part # 145154-4.

       One source for the 92-pin PCI connector is Digi-Key,
       part# 145165-4-ND.  The connector is made by Amp/Tyco
       Electronics, part # 145165-4.

I'm attaching two PDF's I downloaded from Digi-Key.  One is the AMP drawing of the 60pin connector (shows both the connector and the board footprint), the other is their general specification for the entire line of 0.05" spacing connectors.  It has more data than the drawing provides.

The only drawback I see to the PCI connector is that the board edges must be beveled at least 20 degrees, as the drawing shows.  However, beveling more than 20 degress would hurt nothing, as long as you didn't file away the copper pads.  This can be done with a file, a grinder, a dremel with a grinding head, etc.  Anybody can do it with little effort.
FYI, if I remember right Digi-Key sells the 60pin PCI connector I mentioned for US$2.34 in quantities of one.

pdf/pci_socket_1.pdf
pdf/pci_socket_2.pdf

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