AST RESEARCH TECHNICAL BULLETIN TB-0260 02/12/87 USING DISPLAY CARDS WITH AST5251/11 There is a limitation in using monochrome display cards with the AST5251/11 emulation board. If you are defining reverse image fields and underlining as input, some monochrome display cards do not support these features. If you use the AST5250 display card with the 5251/11 card, these attribute limitations will no longer exist.