Re: Apple IIgs motherboard pinout

[supertimer@aol.com (Supertimer)]

phoenyx <quazar@dcnet2000.com> wrote:

>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.