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- From: mattd@apple.com (Matt Deatherage)
- Newsgroups: comp.sys.apple2
- Subject: Re: Media Control qs for Matt Deatherage
- Message-ID: <mattd-010992180129@city-lights.apple.com>
- Date: 2 Sep 92 01:03:28 GMT
- References: <posty.715315729@ultima>
- Sender: news@gallant.apple.com
- Followup-To: comp.sys.apple2
- Organization: Developer Technical Support, Apple Computer, Inc.
- Lines: 71
-
- In article <posty.715315729@ultima>, posty@socs.uts.edu.au (Andrew Roughan)
- wrote:
- >
- >
- > G'day Matt,
- >
- By the way, posting technical questions addressed to only one person is
- a good way to keep other knowledgeable people from chiming in. I
- personally
- know next-to-nothing about the Media Control tools.
-
- > I'm having an interesting time researching information about writing such a
- > driver. Could you possibly enlighten me on the following points?
- >
- > MCGetFeatures, mcFeatSel codes:
- > mcFVideo: what exactly is "toggling of video"?
- > mcFVDisplay: what exactly is "video display of the location"?
- > mcFVOverlay: what exactly are "overlay characters"?
- >
- > MCControl, ctlCommand codes:
- > mcCVideoOn/Off: what exactly does this accomplish?
- > mcCDisplayOn/Off: what exactly does this accomplish?
- > mcCBlankVideo: what exactly does this accomplish?
- >
- I don't know; I've never tried them. Have you? I don't even have a
- controllable device handy to play with.
-
- > Are there any Apple supplied Macros and Equates files for the Media Control
- > Toolset?
-
- If there are, they're on the 6.0 Golden Master CD. I don't have one handy
- and haven't checked.
- >
- > There appears to be an inconsistancy between the Media Ctl CDEV and the
- > DC Printer CDEV. If Slot 2 is set to "Your Card" in the control panel, the
- > DC Printer CDEV still offers "MODEM" as a valid port whereas the Media Ctl
- > CDEV does not. This probably holds for Slot 1 as well.
-
- The DC Printer Control Panel records your choices; the Print Manager
- complains if the chosen port isn't available at print time.
-
- > Is there a published diagram of the way in which Media Control Device Drivers
- > interact with the GS/OS drivers?
- >
- Media Control drivers talk to their peripherals however they can. In some
- cases, like the SCSI peripherals, this uses the GS/OS drivers. In others,
- like through the game port, it does not. It's up to the driver author.
-
- > I have noticed that the Apple IIGS GS/OS Reference and the Apple IIGS GS/OS
- > Device Driver Reference make no mention of the MODEM and PRINTER port drivers.
- > Is there any additional information available on these?
- >
- > The Control L protocol provides a stream of data from the video recorder
- > interspersed with gaps. The only way to send a command from the computer is
- > to wait for a gap.
- > Is it possible for the MODEM and PRINTER port drivers to do this?
- > Or will I have to write a Control L port driver? (i.e. like the AppleTalk
- > driver)
-
- They are Print Manager port drivers, and documented in Apple IIgs Technical
- Note #36. These are _not_ Media Control drivers and you should not try to
- use them as such.
-
- > Andrew Roughan | Snail: PO Box 65 Wahroonga, NSW 2076 Australia
-
- ============================================================================
- Matt Deatherage, Developer Support Center, Apple Computer, Inc.
- Personal mail only -- please POST technical questions, questions about
- Apple and its policies, where to find documents and related inquiries.
- The opinions I express don't represent Apple, which makes us both happy.
- ============================================================================
-