mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-11-03 07:05:57 +00:00
154 lines
9.4 KiB
Forth
154 lines
9.4 KiB
Forth
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\ *** Block No. 0 Hexblock 0
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This video display interface utilizes the ROM BIOS call $10.
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The display is fairly fast and should work on most IBM
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compatible computers
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\ *** Block No. 1 Hexblock 1
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\ BIOS display interface ks 1 secas 09jun20
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Onlyforth \needs Assembler 2 loadfrom asm.fb
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Variable dpage dpage off
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Variable top top off
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Code (at ( lin col -- ) A pop R push U push
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dpage #) R+ mov A- D+ mov 2 # A+ mov $10 int
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U pop R pop D pop Next end-code
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Code (at? ( -- lin col ) D push R push U push
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dpage #) R+ mov 3 # A+ mov $10 int U pop R pop
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D+ A- mov 0 # A+ mov A+ D+ mov A push Next
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end-code
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1 6 +thru .( BIOS display interface active) cr
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\ *** Block No. 2 Hexblock 2
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\ BIOS normal invers blankline ks 1 sep 86
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: full top off ;
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Variable attribut 7 attribut !
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: normal 7 attribut ! ; : invers $70 attribut ! ;
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: underline 1 attribut ! ; : bright $F attribut ! ;
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Code blankline D push R push U push
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dpage #) R+ mov attribut #) R- mov
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3 # A+ mov $10 int ' c/row >body #) C mov
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D- C- sub bl # A- mov 9 # A+ mov $10 int
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U pop R pop D pop Next end-code
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| : lineerase 0 (at blankline ;
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\ *** Block No. 3 Hexblock 3
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\ curshape setpage curat? ks 8 mar 88
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Code curshape ( top bot -- ) D C mov D pop
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D- C+ mov 1 # A+ mov $10 int D pop Next
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end-code
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Code setpage ( n -- )
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$503 # A mov D- A- and $10 int D pop Next
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end-code
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' (at? Alias curat?
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\ *** Block No. 4 Hexblock 4
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\ BIOS (type (emit ks 1 sep 86
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Code (type ( addr len -- ) W pop R push U push
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D U mov dpage #) R+ mov attribut #) R- mov
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3 # A+ mov $10 int U inc C push $E0E # C mov
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1 # A+ mov $10 int 1 # C mov [[ U dec 0= not
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?[[ D- inc ' c/row >body #) D- cmp 0= not
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?[[ W ) A- mov W inc 9 # A+ mov
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$10 int 2 # A+ mov $10 int ]]?
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]? C pop 1 # A+ mov $10 int
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U pop R pop D pop ' pause #) jmp
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end-code
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: (emit ( char -- ) sp@ 1 (type drop ;
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\ *** Block No. 5 Hexblock 5
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\ BIOS (del scroll (cr (page ks 2 sep 86
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: (del (at? ?dup
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IF 1- 2dup (at bl (emit (at exit THEN drop ;
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Code scroll D push R push U push attribut #) R+ mov
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top #) C+ mov 0 # C- mov ' c/row >body #) D- mov
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D- dec ' c/col >body #) D+ mov D+ dec D+ dec
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$601 # A mov $10 int U pop R pop D pop Next
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end-code
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: (cr (at? drop 1+ dup 2+ c/col u>
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IF scroll 1- THEN lineerase ;
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: (page top @ c/col 2- DO I lineerase -1 +LOOP ;
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\ *** Block No. 6 Hexblock 6
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\ BIOS status display ks 2 sep 86
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' (emit ' display 2 + ! ' (cr ' display 4 + !
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' (type ' display 6 + ! ' (del ' display 8 + !
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' (page ' display &10 + !
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' (at ' display &12 + ! ' (at? ' display &14 + !
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: .sp ( n -- ) ." s" depth swap 1+ - 2 .r ;
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: .base base @ decimal dup 2 .r base ! ;
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: (.drv ( n -- ) Ascii A + emit ." : " ;
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: .dr ." " drv (.drv ;
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: .scr blk @ IF ." Blk" blk ELSE ." Scr" scr THEN
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@ 5 .r ;
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: .space ." Dic" s0 @ here $100 + - 6 u.r ;
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\ *** Block No. 7 Hexblock 7
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\ statuszeile ks 1 sep 86
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| : fstat ( n -- ) .base .sp
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.space .scr .dr file? 2 spaces order ;
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: .stat attribut @ output @ (at?
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display invers c/col 1- 0 (at 4 fstat
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blankline (at output ! attribut ! ;
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: +stat ['] .stat Is .status .status ;
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: -stat ['] noop Is .status ;
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\ *** Block No. 8 Hexblock 8
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