I've got the wild idea to make my own super nintendo game with a custom
programed eeprom.. The problem is that they used a 40 pin surface mount prom
which I believe is a SOIC package. Does anywhere stock a socket for this
type of chip? I've found what appears to be the correct socket on an old
cirrus logic video card, but removing it looks to be a real challenge. Now I
think about installing a new one wouldn't be the easiest job either.. Any
ideas?

- Mike

"Michael Kennedy" wrote in message
. ..
I've got the wild idea to make my own super Nintendo game with a custom
programmed EEPROM.. The problem is that they used a 40 pin surface mount
prom which I believe is a SOIC package. Does anywhere stock a socket for
this type of chip? I've found what appears to be the correct socket on an
old cirrus logic video card, but removing it looks to be a real challenge.
Now I think about installing a new one wouldn't be the easiest job
either.. Any ideas?

- Mike

You are seeing fewer sockets in surface mount designs.
are you sure this 40-pin is a SOIC ??
http://en.wikipedia.org/wiki/Surface-mount_technology

Assmann and Mill-Max make surface mount PLCC sockets.
http://www.digikey.com/scripts/DkSea...sus.dll?Filter
DigiKey parts catalog -- page 333
http://dkc3.digikey.com/PDF/T062/0333.pdf

For surface mount, you need to know the proper techniques in order to not
routine the board or components. Good soldering iron and proper sized tip,
temperature control, steady hand and some practice helps.
http://www.geocities.com/vk3em/smtguide/smtguide.htm

I would highly recommend practicing on junked audio/TV circuits or computer
motherboards for practice - (better in your parts drawer or junk box than
the local city landfill)
you might get a few expensive parts for free that way !!
http://www.geocities.com/vk3em/smtgu...-GuideV1-3.PDF

Surface mounting multi-pin components can be performed by hand --
but other approaches are possible and work well.
http://www.seattlerobotics.org/encod...cle2/index.php

Seattle Robotics - Encoder (June 2000)
Have you seen my new soldering Iron?
Kenneth Maxon
http://www.seattlerobotics.org/encod...6/oven_art.htm

You are seeing fewer sockets in surface mount designs.
are you sure this 40-pin is a SOIC ??

Well I'm realtively sure that the old video card that I have has a SOIC
socket on it but the prom in the SNES game I'm trying to put in a socket may
be a TSOP instead. I don't know for sure yet becasue I don't have the game
cartridge yet. I do however have a picture from a web site.

http://johndie.jo.funpic.de/collecti...-PCB-Front.jpg

The IC labeled U1 / mask rom is the one I need to replace with some kind of
removable eprom, eeprom or anything else that would work.. (Flash Rom same
as eeprom?)

I have thought about making this simple and just solder wires from the board
to a DIP socket.




- Mike




"g. beat " @spam protected wrote in message
. ..
"Michael Kennedy" wrote in message
. ..
I've got the wild idea to make my own super Nintendo game with a custom
programmed EEPROM.. The problem is that they used a 40 pin surface mount
prom which I believe is a SOIC package. Does anywhere stock a socket for
this type of chip? I've found what appears to be the correct socket on an
old cirrus logic video card, but removing it looks to be a real
challenge. Now I think about installing a new one wouldn't be the easiest
job either.. Any ideas?

- Mike


http://en.wikipedia.org/wiki/Surface-mount_technology

Assmann and Mill-Max make surface mount PLCC sockets.
http://www.digikey.com/scripts/DkSea...sus.dll?Filter
DigiKey parts catalog -- page 333
http://dkc3.digikey.com/PDF/T062/0333.pdf

For surface mount, you need to know the proper techniques in order to not
routine the board or components. Good soldering iron and proper sized
tip, temperature control, steady hand and some practice helps.
http://www.geocities.com/vk3em/smtguide/smtguide.htm

I would highly recommend practicing on junked audio/TV circuits or
computer motherboards for practice - (better in your parts drawer or junk
box than the local city landfill)
you might get a few expensive parts for free that way !!
http://www.geocities.com/vk3em/smtgu...-GuideV1-3.PDF

Surface mounting multi-pin components can be performed by hand --
but other approaches are possible and work well.
http://www.seattlerobotics.org/encod...cle2/index.php

Seattle Robotics - Encoder (June 2000)
Have you seen my new soldering Iron?
Kenneth Maxon
http://www.seattlerobotics.org/encod...6/oven_art.htm

On Wed, 21 Jun 2006 23:56:22 -0400, "Michael Kennedy"
wrote:

The IC labeled U1 / mask rom is the one I need to replace with some kind of
removable eprom, eeprom or anything else that would work.. (Flash Rom same
as eeprom?)

I have thought about making this simple and just solder wires from the board
to a DIP socket.

That sounds like the way to go. IDC (ribbon) cable has the same pitch
as the SMT ROM's pins, so a lot of people use that. Like here for
example:
http://snesdev.romhack.de/sf2.htm

I think the largest FlashROMs you can get in DIP-32 are 512kB.
29C040, 29F040 etc.

I would say to get a Game Doctor SF7 with a parallel port cable, but I
see you're wanting to use a board with the FX chip. I don't think
it'd work with that one (I'm assuming the FX chip reads from the ROM,
but I don't know, really).

"Michael Kennedy" wrote in message
. ..
You are seeing fewer sockets in surface mount designs.
are you sure this 40-pin is a SOIC ??

Well I'm realtively sure that the old video card that I have has a SOIC
socket on it but the prom in the SNES game I'm trying to put in a socket
may be a TSOP instead. I don't know for sure yet becasue I don't have the
game cartridge yet. I do however have a picture from a web site.

http://johndie.jo.funpic.de/collecti...-PCB-Front.jpg

The IC labeled U1 / mask rom is the one I need to replace with some kind
of removable eprom, eeprom or anything else that would work.. (Flash Rom
same as eeprom?)

I have thought about making this simple and just solder wires from the
board to a DIP socket.

- Mike


Try this web page
http://www.piclist.com/techref/smds.htm

The easiest but most expensive way to use SMD devices is to use a socket.

See these 3 manufacturers
http://www.wellscti.com/

http://www.enplas.com/

http://www.adapters.com/

Adapters and PC boards
You can make your own PCB adapters (for breadboarding or whatever) with
masks from a laser printer.

If you want to use 100 pin IC with 0.5 mm pitch, you will need SMD pads 0.3
mm wide and an isolation gap of 0.2 mm or 8 mil = 0.008 inch. One dot of a
300 dpi printer is 3.333 mil ; 0.00333 inch or 0.08467 mm. The 0.2 mm
isolation gap or track width are only 2.36 dots of a 300 dpi printer and
only 4.72 dots of a 600 dpi printer.

The precision of a laser printer is to bad too. Try to print a line of 100
mm length in both directions and measure it with a high precision ruler. You
will see errors of about 0.5 mm and these errors are different for both
directions. Using InkJet's for photo-resist is generally a better idea than
laser printers - the ink on a transparency is a little more opaque than
toner on a transparency generally. Some of the newer Epson Stylus inkjets
are at 1440dpi, which results in higher accuracy tracks at smaller pitch

There is a free calculator at http://search.ipc.org/SM782/default.asp (it
does require registration, but the allow you to log in thereafter with only
your email address).

There are pull-down menus to select the package you will be using, which may
be specified three different ways. It then will give you a web page with
complete specifications for the placement and dimensions for the SMT pads as
well as exactly how the device leads will be soldered to the pads: Minimum
toe & heel and side fillets are given. This is nice because the part vendors
usually just give you the package dimensions and leave it as an exercise for
the customer to figure out how big to make the pads.

On Wed, 21 Jun 2006 20:17:23 -0400 "Michael Kennedy"
wrote in Message id:
:

I've got the wild idea to make my own super nintendo game with a custom
programed eeprom.. The problem is that they used a 40 pin surface mount prom
which I believe is a SOIC package. Does anywhere stock a socket for this
type of chip? I've found what appears to be the correct socket on an old
cirrus logic video card, but removing it looks to be a real challenge. Now I
think about installing a new one wouldn't be the easiest job either.. Any
ideas?

My first stop is always http://www.emulation.com/ for socket adapters.