Re: TECH Q Burn rom chips

You could also modify the System 7 CPU board as described by Clay:
http://marvin3m.com/sys37/index2.htm#dips scroll to the bottom of the
section and look for " Using a 2732 EPROM in a System7 CPU board at U17"

Waaay quicker than building adapters and cheaper to!

I did this last mod last week to a board I am resurecting and it worked fine
(using Leons test chip anyway).

Woz

<seymour-shabow@xxxxxxxxxx> wrote in message
news:1140796091.276283.230260@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
John and others, came up with a solution (BTW according to their
website it doesn't) - I also have some 2732 and seem to have found
directions on how to build the adapter at

http://www.mikesarcade.com/cgi-bin/spies.cgi?action=url&type=conv&page=Williams_conversion.txt
- the text below was from that site, if anyone wants to build one (as
opposed to buying one from marco or others - there's a ton of people
selling adapters, but I'd rather make my own.... caveat, I just found
this info and have not used it yet.)


6) Create the adaptor for the sound board:

Tech Note: Here are the pinouts for a 2532 and 2732. We want to
build something that will let us plug the 2732 into the
sound board's existing 2532 socket.
__ __ __ __
A7| U |+5V A7| U |+5V
A6| |A8 A6| |A8
A5| |A9 A5| |A9
A4| |A11 A4| |+5V
A3| 2 |!CS A3| 2 |!CS
A2| 7 |A10 A2| 5 |A10
A1| 3 |!CE A1| 3 |A11
A0| 2 |D7 A0| 2 |D7
D0| |D6 D0| |D6
D1| |D5 D1| |D5
D2| |D4 D2| |D4
GND|_____|D3 GND|_____|D3

Note the similarities between these pinouts. All
we have to do is move A11 over to the proper pin,
and bring a GND signal to the 2732's !CE pin (as
the chip should always be enabled).

Just as before, we'll use strip headers for the
"straight through" connections, cutting off any
lines we don't need, and bending any lines we'd
like to reroute away from the chip before rerouting
them.


6.1) Start by putting a couple of 12-pin strip headers into one
of the 24-pin sockets. Cut pin 18 about halfway up, and cut
pin 21 near its base. After you're done your cutting, you
should have something like this:

LEGEND:
-------
# = body of 24-pin socket
! = pins from 24-pin socket
= = breadboard material
* = the plastic that surrounds the row of pins in the strip
header
| = uncut pins from the strip header
x = the stub of the cut pin

| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | x | | | | |
| | | | | | | | | | |
PIN 13 | | | | | | | | x | | | < top of strip header
* * * * * * * * * * * * < plastic surrounding pins
| | | | | | | | | | | | < bottom of strip header
####################### < 24-pin socket body
####################### < 24-pin socket body
! ! ! ! ! ! ! ! ! ! ! ! < pins from 24-pin socket


6.2) As in step 5.5), use your soldering iron to tin the leads of
the tops of the strip header pins and the pins of a 24-pin
socket. This will make step 6.3) infinitely easier to perform,
and make the final product considerably more reliable.


6.3) Again, just as in step 5.6), place the 24-pin socket on *top*
of the strip header pins and solder all connecting pins in place.

When you are done, you should have something that looks like
this:

LEGEND:
-------
# = body of 24-pin socket
! = pins from 24-pin socket
= = breadboard material
* = the plastic that surrounds the row of pins in the strip
header
| = uncut pins from the strip header
x = the stub of the cut pin

####################### < 24-pin socket body
####################### < 24-pin socket body
! ! ! ! ! ! ! ! ! ! ! ! < pins from 24-pin socket
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | x | | | | |
| | | | | | | | | | |
PIN 13 | | | | | | | | x | | | < top of strip header
* * * * * * * * * * * * < plastic surrounding pins
| | | | | | | | | | | | < bottom of strip header
####################### < 24-pin socket body
####################### < 24-pin socket body
! ! ! ! ! ! ! ! ! ! ! ! < pins from 24-pin socket


6.4) This is the tricky bit. You want to connect pin 18 of the
*bottom* socket to pin 21 of the *top* socket. You also
want to connect pin 14 of the adaptor to pin 18 of the top
socket.

This step involves some very tricky and delicate placement of
wires, fingers, and a soldering iron. It can be by one person
without burned fingers, but a third set of hands will probably
make things go a little easier. Just be careful and it'll all
work out. (And come to think of it, it was harder to come up
with these ASCII pictures than it was to do the wiring :-)

What you will end up is something like this, when viewed from
the side:

####################### < 24-pin socket body
####################### < 24-pin socket body
~! ! ! ! ! ! ! ! ! ! ! ! < pins from 24-pin socket
|~|-|-|-|-' | | | | | |
| | | | | ----' | | |
| | | | | /| | | | |
| | | | | x | | | | |
| | | | | | | | | | |
PIN 13 | | | | | | | | x | | | < top of strip header
* * * * * * * * * * * * < plastic surrounding pins
| | | | | | | | | | | | < bottom of strip header
####################### < 24-pin socket body
####################### < 24-pin socket body
! ! ! ! ! ! ! ! ! ! ! ! < pins from 24-pin socket

Finally, just to exhaust the limitations of ASCII art, here's
an oblique X-ray view, with the body of the top socket cut away
and the body of the bottom socket eliminated.

Connect "A" (on pin 14 == GND) to "A" (pin 18 on the top socket),
and connect "B" (pin 18 on the bottom socket) to "B" (pin 21 on
the top socket).

# # # # # # # # # # # # < pin 1 on top socket
A /|||||||||||||||||||||||
/ ||| / / / / / / / / ||| < |||
/ /|||/ / / / / / / / /||| < ||| = top socket material
/ / ||| / / / / / / / / ||| < |||
/ / /|||/ / / / / / / / |||
* * * ||| * * * * * * * ||| < pin 1 on bottom socket
/ / / /|||/ / / / / / / |||
||| |||
|||||||||||||||||||||||
# # # # # # # # # # # # < pin 24 on top socket
/ / / / / / / / / / / /
/ / / / / A / / B / / /
/ / / / / / / / / /
/ / / / / B / / / / /
/ / / / / / / / / / / /
* * * * * * * * * * * * < pin 24 on bottom socket
/ / / / / / / / / / / /

You now have an adaptor which you can plug into any 2532 socket
and use a 2732 chip. If you're feeling masochistic, you can whip
up a few more of these; you never know when one will come in
handy.

Tech Note: No, you can't use these to program 2532s in a burner
configured for 2732s, but you can use it to read 'em,
which is good enough for most purposes.




.

Relevant Pages

  • Re: TECH Q Burn rom chips
    ... sound board's existing 2532 socket. ... = the plastic that surrounds the row of pins in the strip ... < 24-pin socket body ... the tops of the strip header pins and the pins of a 24-pin ...
    (rec.games.pinball)
  • Re: I Have a Telephony Mystery :-)
    ... here's the weird thing -- the ADSL connection works fine when the ... from your description like the upstairs socket was installed for ADSL ... pins) is they're damn-near impossible to find. ...
    (comp.dcom.telecom)
  • Re: Gauging interest in a $25 no-slot clock
    ... Steven Hirsch to comp.sys.apple2.marketplace on Sun Aug 01 2010 ... It was unfortunate that the reliability of such an expensive "chip" was ... copper wire pins. ... The normal wiggling involved in removing a typical IC from its socket ...
    (comp.sys.apple2.marketplace)
  • Re: Octal tube in Loctal socket?
    ... but that an octal tube with it fatter pins can work ... a loctal socket ... meant to be held in by the friction of the large pins. ...
    (alt.guitar.amps)