29 lines
1.0 KiB
Markdown
29 lines
1.0 KiB
Markdown
# Macintosh SE Internal CRT Replacement
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Got a Macintosh SE with a non-functional CRT? No worries, there is
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actually an easy workaround to get video on your Macintosh SE!
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The CRT is controlled by 3 digital output signals:
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* `VIDOUT`
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* `*HSYNC`
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* `*VSYNC`
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These are all 5V logic signals. Therefore, they can be packed up into
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a DB-9 connector for TTL or ECL video. Commercially available flat
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panel displays are avaiable with adapter electronics that can accept
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TTL or ECL video, since these apparently became very popular in
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specialized industrial equipment. Once you've got your monitor and
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connectors all set up, you should be good to go.
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* Visited 2020-08-06:
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https://allpinouts.org/pinouts/connectors/computer_video/ecl-video/
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* Visited 2020-08-06:
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https://allpinouts.org/pinouts/connectors/computer_video/monochrome-ttl/
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It might be relevant that ECL stands for "Emitter Coupled Logic" in
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other contexts, here is a source for reference.
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* Visited 2020-08-06:
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https://technobyte.org/logic-families-ttl-cmos-ecl-bicmos-difference/
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