Apple IIgs motherboard pinout
Jose Ricci
I need to know the pinouts for the internal connectors (power supply,
speaker, fan, etc) in the rom3 motherboard. I own one that I would like to
put in a PC case to get a stronger power supply and cooler operation.
Also, if someone have made this before, I would appreciate some advice.
Thanks.
Jose Ricci
Rubywand
>
> Hi,
>
> I need to know the pinouts for the internal connectors (power supply,
GS Motherboard power connector
_
| |
|7| -5V 0.25 A
|6| -12V 0.25 A
|5| +12V 1.0 A
|4| +5V 4.0 A
|3| No connection
|2| GND
|1| GND
|_|
The pins are viewed as above when you are sitting in front of the
computer, i.e. 7 is closest to the back of the motherboard.
> speaker, fan, etc) in the rom3 motherboard. I own one that I would like to
> put in a PC case to get a stronger power supply and cooler operation.
Speaker polarity should not matter in connecting to a speaker in a PC
tower case except with respect to any other speakers you have connected. If you
leave the IIgs speaker connected, experiment with swapping around the leads to
one speaker to get the 'fullest' sound.
PC cases usually include two or three fans, which should supply enough
cooling without using the +12V DC "Fan" connector on the IIgs motherboard.
> Also, if someone have made this before, I would appreciate some advice.
....
Supertimer has moved a IIgs to a PC tower case. He may have some other
things to suggest.
Rubywand
Supertimer
>Hi,
>
>I need to know the pinouts for the internal connectors (power supply,
>speaker, fan, etc) in the rom3 motherboard. I own one that I would like to
>put in a PC case to get a stronger power supply and cooler operation.
>Also, if someone have made this before, I would appreciate some advice.
I have done this. First of all, before I give you the power
pinout, let me recommend that you get a multimeter from
Radio Shack or other sources too and check and
double check your wiring before connecting the PC
power supply to your IIGS motherboard after installation
in the PC case. My first IIGS motherboard was fried
when I wired up the connector in REVERSE order. ;-(
The power supply connector pinout is as follows:
1. ground
2. ground
3. EMPTY
4. +5 volts
5. +12 volts
6. -12 volts
7. -5 volts
Check the orientation of the connector using the empty
pin 3 on the socket. What I recommend you do is to
use your multimeter to check everything and record
orientation and voltages down on a piece of paper.
Then use a pair of scissors and cut the connector from
the IIGS power supply with a little slack. The PC
power supply has two motherboard connectors. Find
and mark two ground, one +5V, one +12V, one -5V,
and one -12V wires. Use taped labels to identify them
and double check them with the multimeter. Then
cut these from the PC motherboard connector near
the two PC motherboard connectors. Insert a bit of
heat shrink tubing onto each of the cut ends. Then
splice the PC power wires to the equivalent IIGS
ones connected to the IIGS power connector. Pull
down the heat shrink tubing over the splices and use
a lighter to heat them carefully until they shrink tight.
With the PC power supply on, use your multimeter to
check that the IIGS power connector is delivering the
right voltages from the PC power supply. The PC
power supply has now been converted.
For the PC fan, do not use the ROM 3 motherboard
power connector. Rather, plug the fan directly into
one of the PC power supply's connectors. There are
usually an excess number of them.
For sound, just plug PC amplified speakers into the
stereo headphone jack at the back of the IIGS.
http://www.jdr.com/ JDR Microdevices used to sell
a set of speakers that sat in the drive bay of a PC
tower. That would be the neatest solution. The
speakers in that device are amplified, so they are
perfect for the IIGS.
I recommend mounting the motherboard so that the
slots are parallel to the ground. Mounting the
motherboard with the slots perpendicular to the
ground may cause the cards to fall out. You need
to identify the mounting holes on the IIGS mother-
board and drill holes in the PC tower case to
match. Then use motherboard spacers to mount
the motherboard in the tower case.
You can fit your 3.5 drive into one of the drive bays
easily too. Check out the http://www.apple2.org/
website. Tony Diaz's article will tell you how to
do this.
Good luck!
Supertimer
phoenyx
> pinout, let me recommend that you get a multimeter from
> Radio Shack or other sources too and check and
> double check your wiring before connecting the PC
> power supply to your IIGS motherboard after installation
> in the PC case. My first IIGS motherboard was fried
> when I wired up the connector in REVERSE order. ;-(
>
OUCH!!!!
>
> The power supply connector pinout is as follows:
>
> 1. ground
> 2. ground
> 3. EMPTY
> 4. +5 volts
> 5. +12 volts
> 6. -12 volts
> 7. -5 volts
>
With all the power leads left over, you could use
just about any peripheral you desire.
I recently received a IIgs with ram card and accelerator
and remembered you mentioning converting yours to a
tower. I have a spare tower and I think I will do this too
so I won't have to worry about the weak power supply.
I've already lost one years ago and I want this one to go
on forever.
Phoenyx
Supertimer
>Supertimer wrote:
>
>>I have done this. First of all, before I give you the power
>> pinout, let me recommend that you get a multimeter from
>> Radio Shack or other sources too and check and
>> double check your wiring before connecting the PC
>> power supply to your IIGS motherboard after installation
>> in the PC case. My first IIGS motherboard was fried
>> when I wired up the connector in REVERSE order. ;-(
>>
>
>OUCH!!!!
Yup. I still have that motherboard in my closet to
remind me of the mistake. Luckily, I took out all
my peripheral cards first. Since then, the multimeter
has been my best friend.
>> The power supply connector pinout is as follows:
>>
>> 1. ground
>> 2. ground
>> 3. EMPTY
>> 4. +5 volts
>> 5. +12 volts
>> 6. -12 volts
>> 7. -5 volts
>
>With all the power leads left over, you could use
>just about any peripheral you desire.
Agreed. The IIGS really runs a lot better in a PC
case. There is hardly any heat. In contrast, my
backup IIGS has a System Saver GS AND an
internal fan and even with less peripheral cards, it
runs hotter.
Considering that I have many peripheral cards
running off the flagship IIGS in the PC case and
I have not had to install the jumper wires that
Rubywand recommends, I have come to the
conclusion that to really max out the IIGS you
would either have to do what Rubywand suggests
(use the stock 70 watt power supply and fatten
the leads to the slots) OR run the IIGS with a
PC power supply (which provides much extra
source amperage). But putting the IIGS in a PC
case has so many other benefits. Your floppy
and hard drives will be in one place. You'll have
a place for your CD-ROM drive and Zip drive if
present. The IIGS would not heat up the least
even with an accelerator, a video card, an SCSI
card, plus various other peripheral cards (as in
filling up most of the slots).
>I recently received a IIgs with ram card and accelerator
Congratulations. I can email you some unique
software to exercise the capabilities of the IIGS.
Some graphics and sound demos/programs to
be precise. The graphics demo can't be found
anywhere online (I plan to upload it to ground
soon, though), one of the reasons I believe is
that emulators can't run the graphics mode used.
It produces results similar to HAM mode on the
Amiga 1000.
>and remembered you mentioning converting yours to a
>tower. I have a spare tower and I think I will do this too
>so I won't have to worry about the weak power supply.
>I've already lost one years ago and I want this one to go
>on forever.
You won't regret it if you towerize the IIGS. It is
really the way to go. Like they say, Apple II
Forever. ;-) Just remember to test everything with
a multimeter before powering it up and do the
initial testing with your valuable peripheral cards
removed.
Jeff Blakeney
>You won't regret it if you towerize the IIGS. It is
>really the way to go. Like they say, Apple II
>Forever. ;-) Just remember to test everything with
>a multimeter before powering it up and do the
>initial testing with your valuable peripheral cards
>removed.
Personally, if I were going to put my IIgs into a PC case, I'd use a
desktop case. I don't much care for tower cases. In fact, I'd love
to get a desktop case for my Pentium II as it is currently in a mid
sized tower.
+------------------------------------------------------------------------+
| Jeff Blakeney - Dean of the Apple II University in A2Pro on Delphi |
| Delphi Apple II Forums Web Pages |
| A2: http://www.delphi.com/apple2 A2Pro: http://www.delphi.com/a2pro |
+------------------------------------------------------------------------+
Supertimer
>super...@aol.com (Supertimer) wrote:
>
>>You won't regret it if you towerize the IIGS. It is
>>really the way to go. Like they say, Apple II
>>Forever. ;-) Just remember to test everything with
>>a multimeter before powering it up and do the
>>initial testing with your valuable peripheral cards
>>removed.
>
>Personally, if I were going to put my IIgs into a PC case, I'd use a
>desktop case. I don't much care for tower cases. In fact, I'd love
>to get a desktop case for my Pentium II as it is currently in a mid
>sized tower.
Desktop cases have their advantages. For IIGS
conversions, a desktop case will give you peace
of mind because the cards are not hanging in the
slots. For most cards, hanging sideways inside
a tower case with only the slot connection as
support is ok since they are light. However, if
you use a Focus hardcard, then you would not
be able to install it in a towerized IIGS. In such
a case, a desktop is a good alternative.
(For concerned tower users, I can think of one
solution. Run wires between front and back of
the case at each slot and let each card rest
on the wire. As long as you use insulated
wires and tighten them so that there is sufficient
tension, the cards are well protected and have
support while hanging sideways in their slots.)
phoenyx
to spend on my Apples.
If yoy want to send the files, feel free. You're right about the
emulators and the video mode. I've heard Kent has considered
it for Kegs but I'm not holding my breathe. It sounds like a
major task.
Phoenyx
phoenyx
a used case. Even a cheap 386 which you can strip. Most of
the AT and clone cases will work, but stay away from Compaq
and Dell. Most of theirs are proprietary.
Phoenyx