Re: Apple 2 gs and compatibility with a pc monitor

[supertimer@aol.com (Supertimer)]

dempson@actrix.gen.nz (David Empson) wrote:

>Homer's Pet Rock <KWIKEMRT@DEATHSDOOR.COM> wrote:
>
>> I know that a macintosh monitor can be used with a pc with a special adapter
>> but would this work with an old apple 2 gs monitor? How much different is
the
>> gs monitor to the mac monitor? Thanks!
>
>[I've removed comp.sys.apple, which hasn't existed for about ten years,
>and set followups to comp.sys.apple2, which is the only appropriate
>group.]
>
>The IIgs monitor has almost nothing in common with Mac monitors.  It
>expects horizontal scan frequencies similar to television (15.75 kHz or
>thereabouts), and its vertical resolution is limited to around 200 lines
>(noninterlaced, double for interlaced).
>
>Mac monitors are like VGA and higher derivatives: minimum horizontal
>scan frequency is in the region of 30 kHz, and vertical resolution is
>much higher (typically 480 lines or higher, except for the smallest
>monitors that run at 512x384).

Actually, the IIGS monitor has almost everything in common
with Mac and VGA and higher derivatives EXCEPT horizontal
scan frequencies.  They are all analog RGB.

A competent TV/monitor technician can easily change the
scan frequency either up or down by replacing the right
components.  In fact, one of csa2's readers who was such a
technician reported some time back that he had modified a
VGA monitor to accept 15.75Khz horizontal scan frequencies
and with a Mac to VGA adapter cable, presto the IIGS image
shows up on the (former) VGA monitor.