mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
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104 lines
3.3 KiB
Plaintext
104 lines
3.3 KiB
Plaintext
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*``````````````````````````````*
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* TVLIN :: TEXT VERTICAL LINE *
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*- -*
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* CREATES A VERTICAL LINE OF *
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* TEXT COMPOSED OF THE FILL *
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* CHARACTER SPECIFIED AT X. *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ????---- REG: AXYM *
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*- -*
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* CYCLES: ??? *
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* SIZE: *
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*- -*
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* USAGE: *
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* LDA (Y-START) *
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* PHA *
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* LDA (Y-END) *
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* PHA *
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* LDA (X-POS) *
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* PHA *
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* LDA (FILL CHAR) *
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* PHA *
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* JSR TVLIN *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* XPOS START OF LINE (:Y1) *
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* XPOS END OF LINE (:Y2) *
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* YPOS OF LINE (:X) *
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* FILL CHARACTER (:F) *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* Y = END OF LINE *
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* X = HORIZONTAL POSITION *
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* A = LOW BYTE OF RET ADDR *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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TVLIN
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*
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** SAVE RETURN ADDRESS
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*
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PLA
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STA :RETADR
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PLA
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STA :RETADR+1
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*
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** GET PARAMETERS
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*
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PLA
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STA :F ; FILL CHAR
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PLA
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STA :X ; X POS
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PLA
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STA :Y2 ; END
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PLA
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STA :Y1 ; START
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*
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LDX :X
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LDY :Y1
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STY CURSV
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STX CURSH
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JSR VTAB ; SET CURSOR POS
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:LOOP
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JSR COUT1 ; PRINT CHAR
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LDX :X
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STX CURSH
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STY CURSV
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JSR VTAB ; SET NEW CURSOR POS
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LDA :F ; RELOAD FILL CHAR
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INY ; INCREASE COUNTER
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CPY :Y2 ; IF Y1 < Y2
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BNE :LOOP ; LOOP; ELSE, CONTINUE
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:EXIT
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*
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** RESTORE RETURN ADDRESS
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*
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LDA :RETADR+1
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PHA
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LDA :RETADR
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PHA
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*
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RTS
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*
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** DATA
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*
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:RETADR DS 2
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:X DS 1
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:Y1 DS 1
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:Y2 DS 1
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:F DS 1
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