148 lines
1.9 KiB
ArmAsm
148 lines
1.9 KiB
ArmAsm
vt100
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mx %11
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and #$7f
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cmp #' '
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bcs :notctrl
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asl
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tax
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jmp (:ctrl_table,x)
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:notctrl
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ldx state
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jmp (:state_table,x)
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:state_table
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ext vt52_esc,vt52_dca_1,vt52_dca_2
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ext vt100_esc,vt100_csi,vt100_csi_2
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ext vt100_esc_pound,vt100_esc_lparen,vt100_esc_rparen
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dw char
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dw vt52_esc
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dw vt52_dca_1
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dw vt52_dca_2
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dw char
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dw vt100_esc
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dw vt100_csi
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dw vt100_csi_2
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dw vt100_esc_pound
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dw vt100_esc_lparen
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dw vt100_esc_rparen
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:ctrl_table
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dw ctrl_00,ctrl_01,ctrl_02,ctrl_03
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dw ctrl_04,ctrl_05,ctrl_06,ctrl_07
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dw ctrl_08,ctrl_09,ctrl_0a,ctrl_0b
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dw ctrl_0c,ctrl_0d,ctrl_0e,ctrl_0f
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dw ctrl_10,ctrl_11,ctrl_12,ctrl_13
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dw ctrl_14,ctrl_15,ctrl_16,ctrl_17
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dw ctrl_18,ctrl_19,ctrl_1a,ctrl_1b
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dw ctrl_1c,ctrl_1d,ctrl_1e,ctrl_1f
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ctrl_00
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ctrl_01
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ctrl_02
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ctrl_03
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ctrl_04
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ctrl_05 ; answer ENQ
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ctrl_06
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ctrl_0e ; G1 character set
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ctrl_0f ; G0 character set
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ctrl_10
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ctrl_11 ; XON
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ctrl_12
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ctrl_13 ; XOFF
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ctrl_14
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ctrl_15
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ctrl_16
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ctrl_17
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ctrl_19
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ctrl_1c
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ctrl_1d
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ctrl_1e
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ctrl_1f
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rts
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ctrl_07 ; ring the bell.
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rts
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ctrl_1b ; escape -
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* vt100 - aborts current escape sequence and starts a new one.
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* vt52 - esc esc aborts and starts new
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* vt50 - esc esc aborts
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lda DECANM
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bne :vt52
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lda #st_vt100_esc
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sta state
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rts
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:vt52
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lda #st_vt52_esc
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sta state
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rts
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ctrl_18
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ctrl_1a
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* vt100 - abort current escape sequence
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* and display error character.
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lda DECANM
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bne :vt52
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lda #st_vt100
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sta state
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rts
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:vt52
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lda #st_vt52
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sta state
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rts
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ctrl_09 ; tab
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* vt100 has adjustable tabs.
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ext tab_table
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ldx x
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lp:
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cpx #79
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bcs :rts
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lda tab_table,x
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bne :hit
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inx
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bra :lp
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stx x
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jmp update_cursor
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:rts rts
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ctrl_0a ; line feed - cursor down w/ scroll
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ctrl_0b ; vertical tab
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ctrl_0c ; form feed.
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* if LNM is active, equivalent to CR, LF
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lda #LNM
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bne :lnm
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stz x
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:lnm
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lda y
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cmp #23
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blt :simple
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lda #" "
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sta cursor_saved_char
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jmp scroll_down
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:simple
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inc y
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jmp update_cursor
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ctrl_0d ; carriage return - cursor to column 0.
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stz x
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jmp update_cursor
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