macsehw/VIDEO.md

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2020-08-06 23:02:37 +00:00
# Macintosh SE Internal CRT Replacement
Got a Macintosh SE with a non-functional CRT? No worries, there is
actually an easy workaround to get video on your Macintosh SE!
The CRT is controlled by 3 digital output signals:
* `VIDOUT`
* `*HSYNC`
* `*VSYNC`
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These are all 5V logic signals. Therefore, they can be packed up into
a DB-9 connector for TTL or ECL video. Commercially available flat
panel displays are avaiable with adapter electronics that can accept
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
connectors all set up, you should be good to go.
* Visited 2020-08-06:
https://allpinouts.org/pinouts/connectors/computer_video/ecl-video/
* Visited 2020-08-06:
https://allpinouts.org/pinouts/connectors/computer_video/monochrome-ttl/
It might be relevant that ECL stands for "Emitter Coupled Logic" in
other contexts, here is a source for reference.
* Visited 2020-08-06:
https://technobyte.org/logic-families-ttl-cmos-ecl-bicmos-difference/