mirror of
https://github.com/ksherlock/itty-bitty-vtty.git
synced 2024-06-07 22:29:35 +00:00
1cc501e72a
this also adds a hexdump in the CDA for the outgoing buffer in local mode, "incoming" data is read from the outgoing buffer. Currently data is (potentially) sent on each run of the main loop. I thought about using the TX empty interrupt but it still needs to be kicked off at some point (unlike incoming data)
359 lines
4.5 KiB
ArmAsm
359 lines
4.5 KiB
ArmAsm
|
|
lst off
|
|
rel
|
|
xc
|
|
xc
|
|
|
|
mx %11
|
|
use vt.equ
|
|
use apple2gs.equ
|
|
use debug
|
|
|
|
ext scroll_down
|
|
ext recalc_cursor,recalc_cursor_x,recalc_cursor_y
|
|
ext modem_io,init_modem,modem_vector,reset_modem_buffer
|
|
ext keypress
|
|
ext disable_cursor,enable_cursor,cursor_vector
|
|
ext erase_screen,fill_screen
|
|
ext init_tabs
|
|
ext init_audio
|
|
ext init_cda
|
|
|
|
main debug main
|
|
|
|
clc
|
|
xce
|
|
cli
|
|
|
|
pea DPAGE
|
|
pld
|
|
|
|
jsr init
|
|
jsr enable_cursor
|
|
|
|
|
|
lda #4
|
|
tsb VGCINT ; enable 1-sec interrupt.
|
|
stz SCANINT ; reset 1-sec interrupt
|
|
|
|
|
|
loop
|
|
jsr keypress ; check for a keypress, write data to out buffer.
|
|
jsr modem_io ;
|
|
bcc :nope
|
|
pha
|
|
jsr disable_cursor
|
|
pla
|
|
jsr vt100
|
|
bra loop
|
|
|
|
:nope ; no modem data, re-enable the cursor.
|
|
jsr enable_cursor
|
|
bra loop
|
|
|
|
init
|
|
mx %11
|
|
|
|
lda #" "
|
|
jsr fill_screen ; erase first to prevent flash if going 40->80 columns.
|
|
|
|
sta TXTSET
|
|
sta SET80VID
|
|
sta SETALTCHAR
|
|
rep #$30
|
|
|
|
ldx #254
|
|
:zloop stz 0,x
|
|
dex
|
|
dex
|
|
bpl :zloop
|
|
|
|
lda #$0400
|
|
sta cursor_base
|
|
lda #$01
|
|
sta cursor_base+2
|
|
|
|
lda #" " ; 16-bit
|
|
sta erase_char
|
|
|
|
|
|
|
|
lda #$0080
|
|
sta cursor_state
|
|
|
|
sei
|
|
lda cursor_vector
|
|
stal IRQ1SEC
|
|
lda cursor_vector+2
|
|
stal IRQ1SEC+2
|
|
|
|
lda modem_vector
|
|
stal IRQSERIAL
|
|
lda modem_vector+2
|
|
stal IRQSERIAL+2
|
|
|
|
cli
|
|
|
|
lda #0 ; clear high byte
|
|
|
|
sep #$30
|
|
|
|
lda #"_"
|
|
sta cursor_char
|
|
|
|
|
|
lda #23
|
|
sta DECBM
|
|
lda #$80
|
|
* sta LOCAL
|
|
sta DECANM
|
|
|
|
* lda #st_vt52
|
|
lda #st_vt100
|
|
sta state
|
|
|
|
* jsr erase_screen
|
|
jsr init_modem
|
|
jsr init_tabs
|
|
jsr init_audio
|
|
jsr init_cda
|
|
rts
|
|
|
|
reset ent
|
|
mx %11
|
|
php
|
|
|
|
* disable 1-sec interrupt...
|
|
|
|
lda #4
|
|
trb VGCINT ; disable 1-sec interrupt.
|
|
stz SCANINT ; reset 1-sec interrupt
|
|
|
|
|
|
lda #" "
|
|
jsr fill_screen ; erase first to prevent flash if going 40->80 columns.
|
|
|
|
rep #$30
|
|
|
|
ldx #254
|
|
:zloop stz 0,x
|
|
dex
|
|
dex
|
|
bpl :zloop
|
|
|
|
lda #$0400
|
|
sta cursor_base
|
|
lda #$01
|
|
sta cursor_base+2
|
|
|
|
lda #" " ; 16-bit
|
|
sta erase_char
|
|
|
|
|
|
lda #$0080
|
|
sta cursor_state
|
|
|
|
lda #0 ; clear high byte
|
|
|
|
sep #$30
|
|
|
|
lda #"_"
|
|
sta cursor_char
|
|
|
|
|
|
lda #23
|
|
sta DECBM
|
|
lda #$80
|
|
sta DECANM
|
|
|
|
lda #st_vt100
|
|
sta state
|
|
|
|
jsr init_tabs
|
|
* jsr enable_cursor
|
|
|
|
jsr reset_modem_buffer
|
|
|
|
lda #4
|
|
tsb VGCINT ; enable 1-sec interrupt.
|
|
stz SCANINT ; reset 1-sec interrupt
|
|
|
|
plp
|
|
rts
|
|
|
|
|
|
*dispatch ent
|
|
* mx %11
|
|
** a = character to xmit
|
|
* bit LOCAL
|
|
* bmi :local
|
|
* jmp write_modem
|
|
*:local
|
|
* pha
|
|
* jsr disable_cursor
|
|
* pla
|
|
|
|
* fall through
|
|
|
|
vt100
|
|
mx %11
|
|
and #$7f
|
|
cmp #' '
|
|
bcs :notctrl
|
|
asl
|
|
tax
|
|
jmp (:ctrl_table,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
|
|
ext vt100_esc_bad,vt100_csi_bad
|
|
ext draw_char
|
|
|
|
dw draw_char
|
|
dw vt52_esc
|
|
dw vt52_dca
|
|
dw draw_char
|
|
dw vt100_esc
|
|
dw vt100_csi
|
|
dw vt100_csi_2
|
|
dw vt100_esc_pound
|
|
dw vt100_esc_lparen
|
|
dw vt100_esc_rparen
|
|
dw vt100_esc_bad
|
|
dw vt100_csi_bad
|
|
|
|
|
|
:ctrl_table
|
|
dw ctrl_00,ctrl_01,ctrl_02,ctrl_03
|
|
dw ctrl_04,ctrl_05,ctrl_06,ctrl_07
|
|
dw ctrl_08,ctrl_09,ctrl_0a,ctrl_0b
|
|
dw ctrl_0c,ctrl_0d,ctrl_0e,ctrl_0f
|
|
dw ctrl_10,ctrl_11,ctrl_12,ctrl_13
|
|
dw ctrl_14,ctrl_15,ctrl_16,ctrl_17
|
|
dw ctrl_18,ctrl_19,ctrl_1a,ctrl_1b
|
|
dw ctrl_1c,ctrl_1d,ctrl_1e,ctrl_1f
|
|
|
|
|
|
|
|
ctrl_00
|
|
ctrl_01
|
|
ctrl_02
|
|
ctrl_03
|
|
ctrl_04
|
|
ctrl_05 ; answer ENQ
|
|
ctrl_06
|
|
ctrl_0e ; G1 character set
|
|
ctrl_0f ; G0 character set
|
|
ctrl_10
|
|
ctrl_11 ; XON
|
|
ctrl_12
|
|
ctrl_13 ; XOFF
|
|
ctrl_14
|
|
ctrl_15
|
|
ctrl_16
|
|
ctrl_17
|
|
ctrl_19
|
|
ctrl_1c
|
|
ctrl_1d
|
|
ctrl_1e
|
|
ctrl_1f
|
|
rts
|
|
|
|
|
|
ctrl_07 ; ring the bell.
|
|
ext beep
|
|
jmp beep
|
|
|
|
ctrl_1b ; escape -
|
|
* vt100 - aborts current escape sequence and starts a new one.
|
|
* vt52 - esc esc aborts and starts new
|
|
* vt50 - esc esc aborts
|
|
bit DECANM
|
|
bpl :vt52
|
|
lda #st_vt100_esc
|
|
sta state
|
|
rts
|
|
|
|
:vt52
|
|
lda #st_vt52_esc
|
|
sta state
|
|
rts
|
|
|
|
ctrl_18
|
|
ctrl_1a
|
|
* vt100 - abort current escape sequence
|
|
* and display error character.
|
|
* TODO - display error character (mouse text)
|
|
bit DECANM
|
|
bpl :vt52
|
|
lda #st_vt100
|
|
sta state
|
|
rts
|
|
|
|
:vt52
|
|
lda #st_vt52
|
|
sta state
|
|
rts
|
|
|
|
ctrl_08 ; back space
|
|
lda x
|
|
beq :rts
|
|
and #$7f
|
|
dec
|
|
sta x
|
|
jmp recalc_cursor_x
|
|
:rts rts
|
|
|
|
ctrl_09 ; tab
|
|
* vt100 has adjustable tabs.
|
|
ext next_tab_stop
|
|
ldx x
|
|
bmi :rts
|
|
jsr next_tab_stop
|
|
stx x
|
|
jmp recalc_cursor_x
|
|
:rts rts
|
|
|
|
ctrl_0a ; line feed - cursor down w/ scroll
|
|
ctrl_0b ; vertical tab
|
|
ctrl_0c ; form feed.
|
|
|
|
* if LNM is active, equivalent to CR, LF
|
|
|
|
bit #LNM
|
|
bpl :lf
|
|
stz x
|
|
jsr recalc_cursor_x
|
|
|
|
:lf
|
|
lda y
|
|
cmp DECBM
|
|
bne :simple
|
|
|
|
* lda #" " ; needs to factor in reverse video
|
|
* sta cursor_saved_char
|
|
jmp scroll_down
|
|
* if LNM mode, need to update cursor as well.
|
|
|
|
:simple
|
|
cmp #23
|
|
beq :rts
|
|
inc y
|
|
jmp recalc_cursor_y
|
|
|
|
:rts rts
|
|
|
|
ctrl_0d ; carriage return - cursor to column 0.
|
|
stz x
|
|
jmp recalc_cursor_x
|
|
|
|
|
|
sav vt100.main.L
|