itty-bitty-vtty/vt100.S

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ArmAsm
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vt100
mx %11
and #$7f
cmp #' '
bcs :notctrl
asl
tax
jmp (ctrl,x)
:notctrl
ldx state
jmp (:state_table,x)
:state_table
ext vt52_esc,vt52_dca
ext vt100_esc,vt100_csi,vt100_csi_2
ext vt100_esc_pound,vt100_esc_lparen,vt100_esc_rparen
dw char
dw vt52_esc
dw vt52_dca
dw char
dw vt100_esc
dw vt100_csi
dw vt100_csi_2
dw vt100_esc_pound
dw vt100_esc_lparen
dw vt100_esc_rparen
vt100_csi_bad ent
cmp #'@'
blt :rts
ldx #st_vt100
stx state
:rts rts
esc_csi
stz pcount
stz params
stz params+1
stz csi_private
lda #st_csi
sta state
rts
csi
inc state
inc state
cmp #'?'
bne csi0
lda #$80
sta csi_private
rts
csi0
cmp #';'
beq :semi
cmp #'0'
bcc csi_final
cmp #'9'+1
bcs csi_final
:num
and #$0f ; 0-9
tay ; save
ldx pcount
lda params,x
asl ; x 2
sta params,x
asl ; x 4
asl ; x 8
clc
adc params,x
sta params,x
tya
clc
adc params,x
sta params,x
rts
:semi
ldx pcount
inx
cpx #MAX_PCOUNT
bcs :srts
stx pcount
stz params,x
:srts
rts
csi_final
* c, h, l have private modes.
bit csi_private
bmi :priv
cmp #:MIN_FINAL
bcc :rts
cmp #:MAX_FINAL+1
bcs :rts
asl
tax
jmp (:table,x)
:rts rts
:priv
cmp #:MIN_FINAL_PRIV
bcc :rts
cmp #:MAX_FINAL_PRIV+1
bcs :rts
asl
tax
jmp (:table_priv,x)
csi
*
* ESC [ encountered.
*
* ? -> DEC private
* 0-9 -> parameter value
* ; parameter delim
* other - final character.
cmp #'0'
blt :notnum
cmp #'9'+1
bge :notnum
sep #$30
and #$0f
tay
ldx pcount
lda parms,x
asl
pha
asl
asl
clc
adc 1,s
sta 1,s
tya
adc 1,s
ply
sta parms,x
sep #$30
]rts rts
:notnum
cmp #';'
bne :notsemi
ldx pcount
cpx #MAXPCOUNT
bge ]rts
inx
stx pcount
stz parms,
stz parms+1,x
]rts rts
:notsemi
cmp #'?'
bne :final
sta ptype
rts
:final