Subject: Re: HW ref manual
Newsgroups: comp.sys.apple2.programmer
From: dempson@actrix.gen.nz (David Empson)
Date: Sat, 24 Apr 1999 13:29:39 +1200
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Jay Krell <jay.krell@cornell.edu> wrote:

> The information is in the IIGS hardware ref manual, and it's *almost*
> identical.
> 
> Wow..this is clearly a huge bug in the book.
> page 165 of the second edition
> 
> "Figure 7-10 shows the two Apple IIGS game connectors"
> 
> but in fact only one of them is shown. The book therefore never says which
> pin is which. Anyone know?

The DE-9 connector (back panel) is shown, but the 16-pin DIP is missing.

It is pretty easy working out the pin numbers on a standard DIP socket,
so I don't think this is a major omission.  (The same rules apply to
every DIP integrated circuit.)

The only issue is locating pin 1.  There is a notch on the edge of the
socket next to pin 1, and the pins are numbered anticlockwise from
there.  (The notch is usually in the centre, in which case you have to
remember where pin 1 is located relative to the notch.)

On the Apple ][, ][+ and IIe, pin 1 is in the top left corner.
     
   1 |--v--| 16
   2 |     | 15
   3 |     | 14
   4 |     | 13
   5 |     | 12
   6 |     | 11
   7 |     | 10
   8 |-----|  9

On the Apple IIgs, pin 1 is in the bottom right corner, so flip the
diagram above.

> Note that SW3 is new to the Apple IIGS. [ie: the Apple IIGS accommodate
> two two-button joysticks, whereas the II+, IIe, and IIc only accomodate
> three buttons total].

Actually the IIc only has two buttons, only supports two paddle inputs,
and has no annunciators or strobe (no 16-pin connector).

The ][, ][+ and IIe have three buttons, four paddles, four annunciators
and the strobe.

The IIgs has four buttons, four paddles, four annunciators but no
strobe.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand