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CPM OPERATING SYSTEMS/CPM 86/CONCURRENT/CCPM-86 3.1 SOURCE/D5/VSCREEN.EQU

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+;*****************************************************************
+;                                                                *
+;       VIRTUAL   SCREEN   STRUCTURES   AND   EQUATES            *
+;                                                                *
+;*****************************************************************
+
+
+backsp             equ   08H
+escape             equ   01bH
+blank              equ   ' '
+
+crt_col            equ   80                   ; screen sizings
+crt_row            equ   24
+crt_size           equ   crt_col * crt_row
+crtfull            equ   0
+
+                                              ; Screen Structure
+vs_cursor          equ   word ptr    0[bx]    ; cursor pts to attrib and char
+vs_oldcursor       equ   word ptr    2[bx]
+vs_column          equ   byte ptr    4[bx]
+vs_row             equ   byte ptr    5[bx]
+vs_mode            equ   byte ptr    6[bx]    ; screen mode - see vsm values
+vs_attrib          equ   byte ptr    7[bx]
+vs_xy              equ   word ptr    8[bx]    ; x-y coordinates for direct
+vs_old_xy          equ   word ptr  0aH[bx]    ; cursor positioning
+vs_screen_seg      equ   word ptr  0cH[bx]    ; for screen image buffer
+vs_escape_rt       equ   word ptr  0eH[bx]    ; escape routine to ret to
+vs_struc_len       equ   010h                 ; edge up to pp. boundary
+
+                                              ; attribute bit values
+vsa_reverse       equ   01110000B             ; IBM PC compatible
+vsa_normal        equ   00000111B
+vsa_blink         equ   10000000B
+vsa_bright        equ   00001000B
+
+                                              ; mode bit values
+vsm_no_wrap       equ   00000010B             ; CCP/M only
+vsm_nocursor      equ   00000100B
+
+vccb_pcon         equ   0ah
+vccb_vcon         equ   0bh
+