mirror of
https://github.com/ksherlock/itty-bitty-vtty.git
synced 2024-11-24 08:30:54 +00:00
6e0de284e0
to handle DECAWM mode, bit 7 of x ($80 + 79) indicates a wrap is imminent, as opposed to just being in column 79. backspace, etc will drop back to column 78 (based on testing).
119 lines
1.3 KiB
ArmAsm
119 lines
1.3 KiB
ArmAsm
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lst off
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cas se
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rel
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xc
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xc
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use vt.equ
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*control chars
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ext draw_char,update_cursor
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control ent
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asl
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tax
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jmp (:table,x)
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:table
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dw :rts ; ^@
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dw :rts ; ^A
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dw :rts ; ^B
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dw :rts ; ^C
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dw :rts ; ^D
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dw enq ; ^E
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dw :rts ; ^F
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dw bel ; ^G
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dw bs ; ^H
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dw tab ; ^I
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dw lf ; ^J
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dw vt ; ^K
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dw ff ; ^L
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dw cr ; ^M
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dw so ; ^N
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dw si ; ^O
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dw :rts ; ^P
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dw xon ; ^Q
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dw :rts ; ^R
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dw xoff ; ^S
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dw :rts ; ^T
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dw :rts ; ^U
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dw :rts ; ^V
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dw :rts ; ^W
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dw can ; ^X
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dw :rts ; ^Y
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dw sub ; ^Z
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dw esc ; ^[
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dw :rts ; ^\
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dw :rts ; ^]
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dw :rts ; ^^
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dw :rts ; ^_
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:rts rts
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enq
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* send answer back message.
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* answer back message is a user-controllable string of text sent as-is
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* (with no specific terminator character)
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rts
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bel
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* todo - trigger nice ensoniq beep.
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rts
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bs
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* backspace, no wrap
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lda x
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beq :rts
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and #$7f
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dec
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sta x
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jmp update_cursor
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:rts rts
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tab
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* go to next tab stop
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* tab at 80 does not reset overflow.
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rts
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lf
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vt
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ff
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* vt and ff interpreted as lf
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* LNM: also do cr.
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bit LNM
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bpl :lnm
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stz x
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:lnm
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lda y
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cmp BM ; bottom margin
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bne :iny
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jmp scroll_up
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:iny inc y
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jmp update_cursor
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cr
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stz x
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jmp update_cursor
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so ; G1 character set
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si ; G0 character set
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rts
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xon
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xoff
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* flow control...
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rts
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can
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sub
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* cancel esc sequence and display error character
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stz state
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rts
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esc
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lda #st_esc
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sta state
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rts |