Caple C871i Manual do Utilizador descarregar pdf (Página 541)

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Apple II Computer Info

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### FILE : VGAmonitors

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### Created : Tuesday, January 1, 1980 Modified: Thursday, March 1, 1973

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 5252 bytes 5 KB

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In <1ema25d.110cduy1mflxykN%[email protected]>, [email protected] (David

Empson) writes:

>Allen Bong <[email protected]> wrote:

>> What are the differences between a GS rgb monitor and a PC SVGA monitor?

>The IIgs RGB monitor uses TV-compatible scan frequency: about 15.75 kHz.

>VGA and higher resolution monitors operate at a higher scan frequency:

>at least 30 kHz.

>The IIgs can only output video at 15.75 kHz, and modern RGB monitors

>cannot synchronize to such a slow signal, so they won't display the

>image correctly.

>> I ask this because I want to mail order a used IIgs without monitor from

>> ebay and modify a SVGA monitor to work with it. Could it be done?

>In theory, you could get a scan doubling device which would take the

>IIgs video signal as input and produce a double speed video signal as

>output. This would work with many current monitors.

>For some monitors, it is possible to modify their internals to work with

>the lower frequency, but I don't know the details.

An easier and cheaper solution is to pick up an old VGA monitor at a flea market

or surplus

store that can scan down to 15 kHz. I found the following list of monitors so

capable:

Model Manufacturer

Size

Horiz (inch)

Hz Vert

Frequency

KHz

Frequency

7015 ACER

AML-1402

Adara Technology

15-36

45-90

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 541 of 572

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