eMac: What's the CRT's Dot Pitch

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eMac: What's the CRT's Dot Pitch

Hi. I'm planning to mod an eMac at a thrift store for $27 equivalent (not sure how hard it can be revived but they say it doesn't start. It's got no keyboard nor mouse but it has 128MB memory and the power cord's still there) for it to work as a regular TV for retro gaming on a Dreamcast with games doing VGA resolution but what is the dot pitch of the eMac's CRT? Is it .22?

Also if anyone has a link on how to mod the eMac as a VGA monitor so it can be connected to a Dreamcast with a VGA box, that'd be very time saving and very helpful.

Thank you in advance.

God bless, Rev. 21:4

iMac, OS X Yosemite (10.10.1), iMac Late 2009

Posted on Dec 1, 2014 1:45 AM

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Answer 1

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Allan Jones

Level 9

68,696 points

Dec 1, 2014 8:44 AM in response to Alvin777

According to the Apple Development notes for the 1Gen (USB 1.1) eMacs:

The built-in video display uses a 17-inch CRT (16-inch viewable diagonal). The CRT uses shadow-mask technology and has a dot pitch of 0.25 mm. The display has a fixed horizontal scan rate (72 kHz) and supports five resolutions. Table 3-6 lists the resolutions and the vertical scan rates supported.

The display has a mode called Theater Mode that increases the display luminance when playing full-screen video material. Theater Mode is an option in the Displays control panel and is active only when an application requests it.

The display supports pixel depths up to 24 bits (millions of colors) at all resolutions.

Table 3-6

Resolution

640 by 480

800 by 600

1024 by 768

1152 by 864

1280 by 960

Notes for the 2Gen (USB 2.0) eMacs show the hardware specs are basically the same.

Unfortunately those documents do not show any video pin details that would help you with the modding.

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Answer 2

Alvin777 Author

Level 1

128 points

Dec 2, 2014 9:07 AM in response to Allan Jones

Hi Thanks for the reply. Would you know if the it's a flat screen? Coz' I think if it's a flat screen or the old curved one (I think the curved one is measure in dot pitch and the flat one is measured in diagonal pitch. If it has a dot pitch of .25 in the curve one, the equivalent diagonal pitch for that if it's a flat screen tube is .24mm)?

Thank you in advance.

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