The Linux video mode numbers are at 
https://en.wikipedia.org/wiki/VESA_BIOS_Extensions#Linux_video_mode_numbers . 
Since the best resolution of the old CRT I have connected to the machine is 
1280x1024, I tried "vga=792", "vga=794" and "vga=795" and each of those work. 
When in the 1024x768 modes (791, 792) I see pincushioning which I also saw with 
just "nomodeset" (which used 1024x768 automatically).  In either 1280x1024 mode 
I don't, so I settled on "vga=795" (1280x1024, 24-bit). Strangely, checking the 
color depth with the command "xdpyinfo | grep -B3 depths" and looking at the 
first number after "depths" says that it's always in 24-bit, whether the mode I 
chose was 16- or 24-bit.
--
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