576 lines
13 KiB
Plaintext
576 lines
13 KiB
Plaintext
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; PCIO.A -- Screen and keyboard interface routines for the PC
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dseg
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; In this implementation, all special and function keys are translated
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; to the following values.
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;/* control key translations */
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up_char equ 30
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down_char equ 31
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left_char equ 29
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right_char equ 28
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bol_char equ 200
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eol_char equ 201
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pageup_char equ 202
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pagedown_char equ 203
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bof_char equ 204
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eof_char equ 205
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Ins_char equ 206
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Del_char equ 207
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NextWord_char equ 208
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PrevWord_char equ 209
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M1 equ 210
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M2 equ 211
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M3 equ 212
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M4 equ 213
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M5 equ 214
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M6 equ 215
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M7 equ 216
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M8 equ 217
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M9 equ 218
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M10 equ 219
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; the table that is used to make the translation
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convert:
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db 72, up_char
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db 80, down_char
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db 75, left_char
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db 77, right_char
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db 71, bol_char
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db 79, eol_char
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db 73, pageup_char
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db 81, pagedown_char
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db 77H, bof_char
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db 75H, eof_char
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db 82, Ins_char
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db 83, Del_char
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db 115, PrevWord_char
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db 116, NextWord_char
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db 59, M1
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db 60, M2
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db 61, M3
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db 62, M4
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db 63, M5
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db 64, M6
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db 65, M7
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db 66, M8
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db 67, M9
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db 68, M10
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db 0, 255 ; illegal character
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; equates for bios interface.
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; the interrupt and codes for the screen interface interrupt.
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video equ 10h ;interrupt for dealing with screen
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mode equ 0 ;code for setting new screen mode
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curtype equ 1 ;code for setting new cursor type
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setcur equ 2 ;code for addressing cursor
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readcur equ 3 ;code for reading cursor location
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readlp equ 4 ;code for reading light pen position
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setpage equ 5 ;code to select active page
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scrollup equ 6 ;code to scroll screen up
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scrolldn equ 7 ;code to scroll screen nown
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readch equ 8 ;code to read a character from screen
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writeach equ 9 ;code to write char and attributes
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writech equ 10 ;code to write character only
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setpal equ 11 ;code to set new setpal or border
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wdot equ 12 ;code to write a dot
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rdot equ 13 ;code to read a dot
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wtty equ 14 ;code to write as if teletype
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state equ 15 ;code to find current screen status
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; the interrupt and codes for the keyboard interface.
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keyboard equ 16h ;interrupt 16 to deal with keyboard
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cicode equ 0 ;code for reading a character
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cstscode equ 1 ;code for keyboard status
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; caution: must change column number if 40 column mode
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crt_cols equ 80
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; variables available to a C88 program
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public scr_cols_, scr_rows_, scr_scrollup_, scr_scrolldown_
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public scr_mode_,scr_page_,scr_attr_,scr_window_top_
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scr_cols_: dw crt_cols ;current number of columns
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; note- make 25 for ms-dos and 24 for cp/m as cp/m steals the bottom
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; line.
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scr_rows_: dw 25 ;current number of rows
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scr_mode_ db 0 ;current screen mode
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scr_page_ db 0 ;current page
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scr_attr_ db 7 ;current attributes for screen
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;7 is white letters on black
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scr_window_top_ db 2 ;first line to scroll
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; variables needed by SEE. Not used here.
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scr_scrollup_: db 0 ;zero if scrollup leaves top line alone
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scr_scrolldown_:db 0 ;zero if scroll down supported
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cseg
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; SCR_SETUP_ scr_setup must be called before any use of any
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; other routine unless the starting mode is 80X25
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; character mode (3,4 or 7). Must be called for monocrome
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; (mode 7) for scr_curson to set a proper cursor.
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; Usage: scr_setup();
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public scr_setup_
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scr_setup_: push bp
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mov ah,state ;get current state
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int video
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mov scr_mode_,al ;current mode
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mov cl,ah ;make cols a word
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mov ch,0
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mov scr_cols_,cx ;40 or 80 columns
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mov scr_page_,bh
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mov scr_attr_,7 ;set to white chars on black
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cmp al,4 ;see if a character mode
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jc got_attr
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cmp al,7 ;7 is for graphics mode
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jz got_attr
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mov scr_attr_,0 ;attribute is zero in graphics
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got_attr: mov ah,0 ;return int containing mode
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pop bp
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ret
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; SCR_TERM_ do any required termination.
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; Usage: scr_term();
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public scr_term_
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scr_term_:
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ret
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; SCR_SETMODE_ set a new screen mode
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; Usage: scr_setmode(new mode);
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public scr_setmode_
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scr_setmode_: push bp
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mov bp,sp
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mov al,[bp+4] ; new mode value
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mov ah,mode
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int video ; set new mode
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call scr_setup_ ;remember new values
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pop bp
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ret
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; SCR_ROWCOL_ sets cursor at any location.
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; Usage: scr_rowcol(new row, new column);
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public scr_rowcol_
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scr_rowcol_: ; move cursor to x,y
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push bp ; save from bios
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mov bp,sp
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mov dx,[bp+6] ; column
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mov ax,[bp+4] ; row
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mov dh,al
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mov bh,scr_page_ ; force page zero
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mov ah,setcur ; set cursor location
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int video ; call bios
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pop bp
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ret
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; SCR_CLR_ clear entire screen
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; Usage: scr_clr();
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public scr_clr_
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scr_clr_: ; clear screen
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push bp ;save from video call
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mov al,0 ;ask for a clear window
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xor cx,cx ;start at 0,0
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mov dh,byte scr_rows_;last line
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dec dh
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mov dl,byte scr_cols_ ;clear entire width
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dec dl ;last column is width-1
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mov bh,scr_attr_ ;attributes for new blanks
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mov ah,scrollup ;ask for a scrollup to clear
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int video ;do the clear
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pop bp
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ret
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; SCR_CLRL_ clear rest of line.
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; Usage: scr_clrl();
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public scr_clrl_
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scr_clrl_: ; clear rest of line
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push bp
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mov bh,scr_page_
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mov ah,readcur ;see where we are
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int video
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mov cl,byte scr_cols_ ;calc how many chars left in line
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sub cl,dl ;number left
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mov ch,0 ;number of blanks needed
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mov al,' ' ;write blanks
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mov bl,scr_attr_ ;normal attributes
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mov bh,scr_page_ ;page number
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mov ah,writeach ;write the blanks
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int video
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pop bp
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ret
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; SCR_CLS_ clear rest of screen.
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; Usage: scr_cls();
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public scr_cls_
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scr_cls_: ; clear rest of screen
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push bp
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call scr_clrl_ ;clear rest of line
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mov ah,readcur ;see where we are
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mov bh,scr_page_
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int video
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mov al,0 ;ask for a clear window
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mov ch,dh ;current row
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inc ch ;+1
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cmp ch,byte scr_rows_;see if in last line
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jz cleared ;all done
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mov cl,0 ;first column
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mov dh,byte scr_rows_;24 is the last line
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dec dh
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mov dl,byte scr_cols_ ;clear entire width
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dec dl ;last column is width-1
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mov bh,scr_attr_ ;attributes for new blanks
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mov ah,scrollup ;ask for a scrollup to clear
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int video ;do the clear
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cleared: pop bp
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ret
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; SCR_SCUP_ scroll text up leaving top lines alone.
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; Usage: scr_scup();
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public scr_scup_
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scr_scup_: ; scroll last line, screen from line
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; scr_windor_top to end
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mov ax,scr_cols_ ;need last column of screen
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dec ax
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push ax
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mov ax,scr_rows_ ;scroll through last line
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dec ax
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push ax
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xor ax,ax ;from column 0
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push ax
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mov al,scr_window_top_;leave top line alone
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push ax
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mov al,1
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push ax ;scroll by 1
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call scr_scrup_ ;do the scroll
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add sp,10 ;clear arge
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ret
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; SCR_SCRUP_ Scroll the screen up. The window is scrolled
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; up nline lines. A zero nline will clear the
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; window. Top left of the screen in 0,0.
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; Usage: scr_scrup(nline,fromrow,fromcol,torow,tocol);
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public scr_scrup_
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scr_scrup_: push bp
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mov bp,sp
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mov al,[bp+4] ;number of lines
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mov ch,[bp+6] ;starting row
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mov cl,[bp+8] ;starting column
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mov dh,[bp+10] ;ending row
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mov dl,[bp+12] ;ending column
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mov bh,scr_attr_ ;current attribute
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mov ah,scrollup
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int video ;do the scroll
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pop bp
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ret
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; SCR_SCDN_ scroll all but the top lines down one.
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; Usage: scr_scdn();
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public scr_scdn_
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scr_scdn_:
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mov ax,scr_cols_ ;need last column of screen
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dec ax
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push ax
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mov ax,scr_rows_ ;scroll through last line
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dec ax
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push ax
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xor ax,ax ;from column 0
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push ax
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mov al,scr_window_top_;leave top lines alone
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push ax
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mov al,1
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push ax ;scroll by 1
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call scr_scrdn_ ;do the scroll
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add sp,10 ;clear arge
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ret
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; SCR_SCRDN_ scroll the screen down. the window is scrolled
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; down nline lines. A zero nline will clear the
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; window. Top left of the screen in 0,0.
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; Usage: scr_scrdn(nline,fromrow,fromcol,torow,tocol);
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public scr_scrdn_
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scr_scrdn_: push bp
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mov bp,sp
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mov al,[bp+4] ;number of lines
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mov ch,[bp+6] ;starting row
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mov cl,[bp+8] ;starting column
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mov dh,[bp+10] ;ending row
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mov dl,[bp+12] ;ending column
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mov bh,scr_attr_ ;current attribute
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mov ah,scrolldn
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int video ;do the scroll
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pop bp
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ret
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; SCR_CO_ write a character to the screen. this
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; routine increments the cursor position
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; after writing. normal C88 puts and printf
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; statements can also be used to write to the
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; screen.
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; Usage: scr_co_(character);
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public scr_co_
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scr_co_: ; standard console output
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push bp
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mov bp,sp
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mov al,[bp+4] ;character to write
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mov bh,scr_page_
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mov ah,wtty ;use tty write routine
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int video
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pop bp
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ret
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; SCR_CI_ keyboard input. function and soft keys are
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; translated. see equates for values.
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; Usage: character = scr_ci();
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public scr_ci_
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scr_ci_: ;return the next character
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; translate if necessary
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push bp
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mov ah,cicode ;ask for a keyboard character
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int keyboard
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cmp al,0
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jne not_special
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mov bx, offset convert ; convert special key
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ci_loop:
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cmp byte[bx],0
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jz got_it
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cmp ah, byte[bx]
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je got_it
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add bx,2
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jmp ci_loop
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got_it: inc bx
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mov al,[bx]
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mov ah,0
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pop bp
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ret
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not_special: mov ah,0
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pop bp
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ret
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; SCR_CSTS_ return character if any available. otherwise
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; return zero.
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; Usage: character = scr_csts();
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public scr_csts_
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scr_csts_: ;return coded character if any available
|
||
|
|
push bp
|
||
|
|
mov ah,cstscode
|
||
|
|
int keyboard
|
||
|
|
mov ax,0
|
||
|
|
jz csts_over
|
||
|
|
call scr_ci_ ;get the coded character
|
||
|
|
csts_over: pop bp
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_SET_CURSOR_ does nothing. needed by SEE.
|
||
|
|
|
||
|
|
|
||
|
|
public scr_set_cursor_
|
||
|
|
scr_set_cursor_: ; set the visible cursor to the
|
||
|
|
; current position
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_SINP_ screen input (read character from the screen).
|
||
|
|
|
||
|
|
; Usage: character = scr_sinp();
|
||
|
|
|
||
|
|
public scr_sinp_
|
||
|
|
scr_sinp_:
|
||
|
|
push bp ;save the registers
|
||
|
|
mov bh,scr_page_
|
||
|
|
mov ah,readch ;code to read a character
|
||
|
|
int video ;al is letter, ah=attributes
|
||
|
|
or al,al ;zero returned instead of blank in
|
||
|
|
;graphics mode
|
||
|
|
jnz ret_ch
|
||
|
|
mov al,' '
|
||
|
|
ret_ch: mov ah,0 ;kill the attributes
|
||
|
|
pop bp
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_CURSOFF_ turn cursor off.
|
||
|
|
|
||
|
|
; Usage: scr_cursoff();
|
||
|
|
|
||
|
|
public scr_cursoff_
|
||
|
|
scr_cursoff_:
|
||
|
|
push bp ;save registers
|
||
|
|
cmp scr_mode_,4 ;see if graphics
|
||
|
|
jc text_coff
|
||
|
|
cmp scr_mode_,7
|
||
|
|
jnz no_cur
|
||
|
|
text_coff:
|
||
|
|
mov cx,0f00h ;should turn cursor off
|
||
|
|
new_cur: mov ah,curtype ;set a new cursor type
|
||
|
|
int video
|
||
|
|
no_cur: pop bp
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_CURSON_ turn cursor back on.
|
||
|
|
|
||
|
|
; Usage: scr_curson();
|
||
|
|
|
||
|
|
public scr_curson_
|
||
|
|
scr_curson_:
|
||
|
|
push bp
|
||
|
|
mov cx,0c0dh ;assume monocrome
|
||
|
|
cmp scr_mode_,7 ;true is mono
|
||
|
|
jz new_cur ;set it
|
||
|
|
mov cx,0607h ;assume color card in text mode
|
||
|
|
cmp scr_mode_,4 ;color text is 0 to 3
|
||
|
|
jc new_cur
|
||
|
|
pop bp ;do nothing if in graphics mode
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_MARK -- mark the current character on the screen.
|
||
|
|
; Used to delimit block areas in SEE. Just write
|
||
|
|
; an X or something if reverse video is not available.
|
||
|
|
; Usage: scr_mark(current character);
|
||
|
|
|
||
|
|
public scr_mark_
|
||
|
|
scr_mark_: ; mark the passed char,
|
||
|
|
; cursor does not advance
|
||
|
|
push bp
|
||
|
|
mov al,219 ;just write a block character
|
||
|
|
mov bl,scr_attr_ ;normal attributes
|
||
|
|
mov cx,1 ; one character
|
||
|
|
mov bh,scr_page_ ;page number
|
||
|
|
mov ah,writeach ;write char and attr
|
||
|
|
int video ;write character and attributes
|
||
|
|
pop bp
|
||
|
|
ret
|
||
|
|
|
||
|
|
|
||
|
|
; the following routine is not used by either SEE or D88.
|
||
|
|
|
||
|
|
|
||
|
|
; SCR_APUTS_ write a string and attributes to the screen.
|
||
|
|
; the cursor is moved normally
|
||
|
|
|
||
|
|
; Usage: acr_aputs("Print This",attribute);
|
||
|
|
; attribute is BRGBIRGB
|
||
|
|
; | | | |
|
||
|
|
; | | | color for letter. 7 is white
|
||
|
|
; | | intensity for letter
|
||
|
|
; | color for background. 0 is black
|
||
|
|
; blinking
|
||
|
|
|
||
|
|
public scr_aputs_
|
||
|
|
scr_aputs_:
|
||
|
|
push bp
|
||
|
|
mov bp,sp
|
||
|
|
mov ah,readcur ;see where we are
|
||
|
|
int video ;dx is cursor location, bh is page
|
||
|
|
mov si,[bp+4] ;string pointer
|
||
|
|
mov cx,1 ;number of characters to write
|
||
|
|
mov bl,[bp+6] ;attribute
|
||
|
|
naputs: cld
|
||
|
|
lodsb ;next character to write
|
||
|
|
or al,al ;zero at end
|
||
|
|
jz eaputs
|
||
|
|
cmp al,10 ;look for LF
|
||
|
|
jnz normal_ap
|
||
|
|
ap_scroll: mov bp,sp ;reset pointer to next char
|
||
|
|
mov [bp+4],si
|
||
|
|
mov al,13 ;use tty output to scroll screen
|
||
|
|
mov ah,wtty
|
||
|
|
int video ;write cr,lf
|
||
|
|
mov ah,wtty
|
||
|
|
mov al,10
|
||
|
|
int video
|
||
|
|
pop bp
|
||
|
|
jmp scr_aputs_ ;start over
|
||
|
|
normal_ap:
|
||
|
|
mov bh,scr_page_ ;page number
|
||
|
|
mov ah,writeach ;write char and attr
|
||
|
|
int video ;write character and attributes
|
||
|
|
inc dl ;next column
|
||
|
|
cmp dl,crt_cols ;see if wrapping around
|
||
|
|
jc set_loc
|
||
|
|
mov dl,0 ;at start of column
|
||
|
|
inc dh ;at next row
|
||
|
|
cmp dh,byte scr_rows_;see if need a scroll
|
||
|
|
jc set_loc
|
||
|
|
jmp ap_scroll ;do a scroll up
|
||
|
|
set_loc: mov ah,setcur ;move the cursor
|
||
|
|
int video
|
||
|
|
jmp naputs
|
||
|
|
eaputs: pop bp
|
||
|
|
ret
|
||
|
|
|