Neither everyman nor LEM are necessarily correct on any given spec, neither has all the specs and sometimes they're both wrong or have failed to include some info. Use 'em both and you'll get it close enough to right most of the time.

Portrait Res is Rock Solid on the IIsi, it's grayscale, 2bit deep and a Macintosh fixed res standard that's apparently not supported (correctly) by the monitor you're using. It's pretty much the only USABLE res the IIsi produces as far as I'm concerned.

If you want the real deal, google the DevNotes:

On-board videoIn addition to the existing NuBus video options, a new video

solution has been built into the Macintosh IIsi computer, supporting

the Macintosh II 12-inch B&W, 12-inch and

13-inch RGB monitors and the 15-inch B&W portrait monitor. The

12-inch and 13-inch monitors are supported at up to 8 bits per pixel

(256 colors or shades of gray) and the

15-inch portrait monitor is supported at up to 4 bits per pixel (16

grays).

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