Re: Apple 14" composite monitor on IIGS?

[dempson@actrix.gen.nz (David Empson)]

SlickRCBD <Metallic@rr.army.mil> wrote:

> In article <1fc967x.1aib477a17igmN%dempson@actrix.gen.nz>,
> dempson@actrix.gen.nz (David Empson) wrote:
> 
> > Another possible option would be to locate a CGA monitor (digital RGB)
> > and use that via the 10 pin digital RGB output connector on the PC
> > Transporter (you need another adaptor cable to get it to the standard 9
> > pin CGA connector).  Such a monitor wouldn't be able to display IIgs
> > video output, so you would end up with two independent displays.
> 
> I have a CGA/EGA monitor for an old system somebody gave me. However, the
> plug looks almost identical to the plug for my joystick port, not the
> socket on the PCT.

If it is a CGA monitor, it should have a 9 pin D-shaped male connector,
which is exactly the same as the plug which goes into the external
joystick port on the Apple IIe, IIc and IIgs.

An EGA monitor might need a larger plug - it has 6 bits for the colour
signals (two bits each for red, green and blue) compared to CGA's 4 bits
(three bit encoded colour plus one bit intensity).

> What kind of adapter do I need, or is the monitor
> incompadible?

One of the optional accessories for the PC Transporter was a CGA adaptor
cable.  It is a short ribbon cable with a 10 pin IDC connector at one
end, and a D9 female at the other end.  It plugs into J6 on the PC
Transporter, which is the same connector used by the cable which goes to
the ColorSwitch card.

Unfortunately, this appears to be the only PC Transporter accessory
which I _don't_ have.  (I thought I did have one, but it isn't in the
box with the other cables.  The box hasn't been opened for several
years.)

If anyone else has one, they may be able to decipher the pinout, and it
shouldn't be too hard to construct one.

-- 
David Empson
dempson@actrix.gen.nz