[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: C= Analog RGB on IIGS?
- Subject: Re: C= Analog RGB on IIGS?
- From: Roger Johnstone <rojaws@mac.com>
- Date: Fri, 30 Nov 2001 06:24:58 +0000 (UTC)
- Newsgroups: comp.sys.apple2, comp.sys.apple2.marketplace
- Organization: ihug ( New Zealand )
- Xref: archiver1.google.com comp.sys.apple2:15300 comp.sys.apple2.marketplace:2118
Jeff Thomas wrote:
>Hi,
>
>I would like to know, if is it is possible to connect an Commodore (C=)
>1084S Analog RGB Colour monitor to the Apple IIGS and get colour?
Yes.
>Does
>it matter which video format?? My Apple IIGS came from Canada, is that
>NSTC or PAL? I know for certain, that the C= monitor is PAL.
Your IIGS should be NTSC, in fact I don't believe Apple ever made a PAL IIGS. It doesn't matter though for RGB video.
>For the cable, what is the pin assignment for output 15-pin D-style
>(Female) connector on Apple IIGS?
> And refresh rate/raster (e.g. 50Hz),
>& line (e.g. 15625Hz) frequency?
My web site has the pin connections at http://homepage.mac.com/rojaws/apple2/scart.html
The IIGS can run its video output at either 50 or 60Hz. To switch, hold down the option key while turning on the computer, or hold down option+control and press reset. You'll get a menu to choose between 50 and 60Hz, for a PAL monitor you would normally need to use 50Hz. And yes, the line frequency is about 15625Hz.
>By hooking up, a Y-adpator (to the sound port) with two RCA plugs on the
>other end, do I then get the left and right audio - thus, enabling me,
>to connect it to the monitor, for stereo sound (and requires it, for
>sound)?
Unfortunately, no. It's mono only, I think it is a stereo connector but with both channels wired together. While the IIGS sound chip can produce up to 16 channels, it needs to be decoded. Apple didn't include any circuitry to do it, just an expansion connector. The connector allows up to 8 channels, but most IIGS sound cards just decode all the odd channels to one side and all the even channels to the other side.
>What is the sound output level? (e.g. 1.0 RMS/per channel, 177
>mV, 10K Ohm)?? Can I also, connect it to the aux-port on my home
>stereo???
The sound output on the back is designed to drive headphones. Its impedance is about 43 ohms. It can be used to drive a line level input since you can easily adjust the output volume in the control panel.
>Thanks!
You're welcome,
Roger Johnstone, Invercargill, New Zealand
-------------------------------------------------------------------------
Apple II - Future Cop:LAPD - iMac Game Wizard - WarCraft II
http://homepage.mac.com/rojaws