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