Jeremy Penner
6521a2127b
assemble.jrt for creating assemble.com which has asm.jrt preloaded rebuild.bat for re-bootstrapping tinyjort from scratch and verifying that minijort and assemble produce the same binary small CGA textmode vocabulary with test program
48 lines
774 B
Plaintext
Executable file
48 lines
774 B
Plaintext
Executable file
0 VAR, textpage
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0x0f VAR, textpen
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80 const pagew
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25 const pageh
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0xb800 CONST TEXTMEM
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: PREP-TEXTCOPY
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MOV ES t& TEXTMEM @+
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MOV AH textpen @+
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MOV DI textpage @+ ;
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:ASM fill-page ( char -- )
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POP AX
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PREP-TEXTCOPY
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MOV CX pagew pageh * #
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REPZ STOSW
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NEXT
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0 VAR, textpos
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: textx textpos @ pagew % ;
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: texty textpos @ pagew / ;
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: textx! texty pagew * + textpos ! ;
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: texty! pagew * textx + textpos ! ;
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: nextline texty 1+ pagew * textpos ! ;
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: PREP-TEXTCOPY-XY
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PREP-TEXTCOPY
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ADD SI textpos @+ ;
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:ASM draw-text ( s -- )
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MOV BX SI
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POP SI
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PREP-TEXTCOPY-XY
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L: draw-next-char
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LODSB
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OR AL AL
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JZ 0 @>
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STOSW
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JMP draw-next-char
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0 <:
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SUB DI textpage @+
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INC DI
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MOV textpos @+ DI
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MOV SI BX
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NEXT
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