mirror of
https://github.com/ksherlock/itty-bitty-vtty.git
synced 2024-11-23 17:33:57 +00:00
310 lines
4.4 KiB
ArmAsm
310 lines
4.4 KiB
ArmAsm
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lst off
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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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mx %11
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ext recalc_cursor,recalc_cursor_x,recalc_cursor_y
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ext scroll_up,scroll_down
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vt100_esc ent
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* #[()=>cH78DEM
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* based on testing, unspecified chars in the 0x20-0x2f range cause it
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* to gobble chars until 0x30- terminator (which ends the sequence but
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* does not take an action)
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* esc 1 -> hangs? [undocumented]
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ldx #st_vt100
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stx state
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cmp #:MIN
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blt :bad
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cmp #:MAX+1
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bge :rts
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sec
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sbc #:MIN
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asl
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tax
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jmp (:table,x)
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:bad
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ldx #st_vt100_esc_bad
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stx state
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:rts
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rts
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:MIN equ 35
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:MAX equ 99
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:table
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dw :pound ; #
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dw :bad ; $
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dw :bad ; %
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dw :bad ; &
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dw :bad ; '
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dw :lparen ; (
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dw :rparen ; )
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dw :bad ; *
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dw :bad ; +
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dw :bad ; ,
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dw :bad ; -
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dw :bad ; .
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dw :bad ; /
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dw :rts ; 0
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dw :rts ; 1
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dw :rts ; 2
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dw :rts ; 3
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dw :rts ; 4
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dw :rts ; 5
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dw :rts ; 6
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dw esc_7 ; 7
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dw esc_8 ; 8
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dw :rts ; 9
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dw :rts ; :
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dw :rts ; ;
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dw :rts ; <
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dw esc_eq ; =
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dw esc_gt ; >
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dw :rts ; ?
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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 esc_D ; D
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dw esc_E ; E
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dw :rts ; F
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dw :rts ; G
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dw esc_H ; H
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dw :rts ; I
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dw :rts ; J
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dw :rts ; K
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dw :rts ; L
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dw esc_M ; M
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dw :rts ; N
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dw :rts ; O
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dw :rts ; P
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dw :rts ; Q
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dw :rts ; R
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dw :rts ; 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 :rts ; X
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dw :rts ; Y
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dw :rts ; Z
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dw :csi ; [
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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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dw :rts ; `
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dw :rts ; a
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dw :rts ; b
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dw esc_c ; c
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:lparen
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ldx #st_vt100_esc_lparen
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stx state
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rts
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:rparen
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ldx #st_vt100_esc_rparen
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stx state
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rts
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:pound
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ldx #st_vt100_esc_pound
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stx state
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rts
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:csi
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ldx #st_vt100_csi
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stx state
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rts
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esc_7 ; save cursor position, graphic rendition, and character set.
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lda x
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sta saved_x
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lda y
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sta saved_y
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rts
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esc_8 ; restore cursor position, graphic rendition, and character set.
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* TODO - how does this interact with DECOM?
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lda saved_x
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sta x
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lda saved_y
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sta y
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jmp recalc_cursor
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esc_eq ; enter alternate keypad mode
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lda #$80
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sta DECKPAM
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rts
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esc_gt ; exit alternate keypad mode
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stz DECKPAM
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rts
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esc_H ; set tab stop
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ext set_tab
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ldx x
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bmi :rts
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jmp set_tab
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:rts rts
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esc_E ; next line
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* This sequence causes the active position to move to the first position
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* on the next line downward. If the active position is at the bottom
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* margin, a scroll up is performed.
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stz x
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jsr recalc_cursor_x
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; drop through
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esc_D ; index
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* This sequence causes the active position to move downward one line
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* without changing the column position. If the active position is at the
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* bottom margin, a scroll up is performed.
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lda y
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cmp DECBM
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beq :scroll
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cmp #23
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beq :rts
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inc y
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jmp recalc_cursor_y
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:scroll jmp scroll_down
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:rts rts
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esc_M ; reverse index
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* Move the active position to the same horizontal position on the
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* preceding line. If the active position is at the top margin, a scroll
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* down is performed.
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lda y
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cmp DECTM
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beq :scroll
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cmp #0
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beq :rts
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dec y
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jmp recalc_cursor_y
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:scroll jmp scroll_up
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:rts rts
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esc_c ; reset terminal.
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rts
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vt100_esc_bad ent
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cmp #'0'
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blt :rts
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ldx #st_vt100
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stx state
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:rts
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rts
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vt100_esc_pound ent
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* esc # 3 - make line double height (top half)
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* esc # 4 - make line double height (bottom half)
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* esc # 5 - make line single width, single height
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* esc # 6 - make line double width
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* esc # 8 - screen alignment - fill screen with E (SGR not honored)
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* based on testing, this also resets the scrolling region and homes
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* the cursor.
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* based on testing, 0+ are term characters, 0x20-0x2f puts it in
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* esc_bad state
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ldx #st_vt100
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stx state
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cmp #:MIN
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blt :bad
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cmp #:MAX+1
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bge :rts
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sec
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sbc #:MIN
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asl
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tax
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jmp (:table,x)
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:bad ldx #st_vt100_esc_bad
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stx state
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:rts rts
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:MIN equ 48
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:MAX equ 57
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:table
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dw :rts ; 0
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dw :rts ; 1
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dw :rts ; 2
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dw :rts ; 3
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dw :rts ; 4
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dw :rts ; 5
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dw :rts ; 6
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dw :rts ; 7
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dw :e ; 8
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dw :rts ; 9
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:e
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* TODO - does this reset DECOM?
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ext fill_screen
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stz x
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stz y
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stz DECTM
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lda #23
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sta DECBM
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jsr recalc_cursor
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lda #"E"
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jmp fill_screen
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vt100_esc_lparen ent
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vt100_esc_rparen ent
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* ( sets G0, ) sets G1
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* A - UK set
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* B - ASCII set
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* 0 - Special Graphics
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* 1 - Alternate Char ROM Standard Char Set
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* 2 - Alternate Char ROM Special Graphics
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* SO, aka Control-N aka 0x0e set the G1 char set
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* SI, aka Control-O aka 0x0f set the G0 char set
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* not currently supported.
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ldx #st_vt100
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stx state
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cmp #'0'
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blt :bad
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rts
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:bad ldx #st_vt100_esc_bad
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stx state
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:rts rts
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sav vt100.esc.L
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