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Re: RGB-connection question??
In article <10DC16A9@rook.wa.com>,
eugene welcome <EUGENE.WELCOME@rook.wa.com> wrote:
> >Hello, I have a friend with an Apple 2c+. I asked me what the pin
> >configuration is,but I honestly have no idea.
>
> Hi Joe: Here is what I have on the IIc and Laser128 as they were the
> same. [snip]
The information in your post about the IIc video port is WRONG!
It may be correct for the Laser 128. The IIc's video port has a set
of internal signals. The pins listed here might be correct for an RGB
adaptor attached to the IIc video port, but the video port itself does
NOT have any of the signals expected by an RGB monitor (they have to be
generated by an adaptor).
The following table (from your post) is correct for the IIgs, but most
of the listed signals for the IIc are wrong.
> Apple IIgs RGB Apple IIc and Laser-128 RGB
> Pin Signal Pin Signal
> === ====== === ======
> 1 Ground 1 Intensity signal
> 2 Red analog video 2 F14M - 14 MHz
> 3 Composite sync 3 Red - signal
> 4 Not connected 4 Blue - signal
> 5 Green analog video 5 Spkr sound output
> 6 Ground 6 Load Pulse for LCD
> 7 -5 volts 7 Dispen for LCD
> 8 +12 volts 8 +12 volts DC
> 9 Blue analog video 9 Horizontal Sync Signal
> 10 Not connected 10 Composite Video Sync Signal
> 11 Sound 11 Serial out - Data for LCD
> 12 Composite video (NTSC, PAL, 12 Composite Video Output
> or SECAM ) 13 Ground
> 13 Ground 14 Vertical Sync Signal
> 14 Not connected 15 Green - Signal
> 15 Not connected Note LCD = Liquid Crystal Display
The actual functions of the IIc video port are as follows:
1 TEXT Indicates text mode is active (special function in DHR mode)
2 14M 14 MHz clock sigal
3 SYNC Horizontal and vertical sync
4 SEGB Vertical counter signal from IOU, or lo-res indication
5 1VSOUND Sound output (one volt peak-to-peak)
6 LDPS Video shift load enable
7 WNDW Active area display blanking
8 +12V +12 volts DC
9 PRAS RAM row address strobe
10 GR Graphics mode enable
11 SEROUT Serialized character generator output
12 NTSC Composite NTSC video output
13 GND Ground reference
14 VIDD7 Bit 7 of video shift latch (for hires mode colour shifting)
15 CREF Colour reference timing signal
These come from the IIc Technical Reference, both first and second
editions.
It is odd that your listing for the IIc is correct for some of the
signals, but has RGB outputs in place of the IIc's timing signals.
You cannot connect a monitor directly to the IIc video port (with the
possible exception of the the LCD display, or an NTSC monitor). An
adaptor is required to generate the appropriate video signals for an
RGB monitor.
--
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand