From Louis Ohland@21:1/5 to All on Tue Feb 8 23:40:04 2022
MONO MODE NOT SUPPORTED ON THE 8530
THE MONO MODE IS NOT ALLOWED ON THE 8530 WITH A MONOCHROME DISPLAY
(8503) ATTACHED TO THE SYSTEM. IF YOU SPECIFY MODE MONO USING DOS YOU
WILL GET THE ERROR MESSAGE "INVALID PARAMETERS". THE 8503 MONITOR IS A "MONOCHROME" DISPLAY CAPABLE OF DISPLAYING 64 SHADES OF GREY. MODE MONO,
WHICH IS MODE 7 IS NOT A SUPPORTED MODE ON THE 8530. THE 8530 OPERATES
IN COLOR GRAPHICS MODES ONLY, EXCEPT WHEN A PERSONAL SYSTEM/2 DISPLAY
ADAPTER IS INSTALLED.