because that port you're connecting to isn't an RGB port. It's a contraption called "video expansion" unique to the IIc/IIc+; that, with additional hardware, an RGB or similar signal can be created to drive an external display.
Post #2 by dorkbert
| Source Forum | Apple IIc+ won't boot when connected to monitor — #2 |
|---|---|
| Category | Software |
| Post Date | Tue, 14 Aug 2012 - 21:48 |
| Original URL | https://68kmla.org/bb/threads/apple-iic-wont-boot-when-connected-to-monitor.26021/ |
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