2021-09-04 21:52:35 +00:00
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2021-09-05 21:04:52 +00:00
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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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2021-09-04 21:52:35 +00:00
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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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2021-09-17 23:50:56 +00:00
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and #$7f
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dec
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sta x
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2021-09-04 21:52:35 +00:00
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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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2021-09-17 23:50:56 +00:00
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* tab at 80 does not reset overflow.
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2021-09-04 21:52:35 +00:00
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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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2021-09-05 21:04:52 +00:00
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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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2021-09-04 21:52:35 +00:00
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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
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