mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-26 11:30:12 +00:00
822 lines
16 KiB
ArmAsm
822 lines
16 KiB
ArmAsm
;=====================================================================
|
|
;= ROUTINES
|
|
;=====================================================================
|
|
|
|
|
|
clear_screens:
|
|
;===================================
|
|
; Clear top/bottom of page 0
|
|
;===================================
|
|
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
;===================================
|
|
; Clear top/bottom of page 1
|
|
;===================================
|
|
|
|
lda #$4
|
|
sta DRAW_PAGE
|
|
jsr clear_top
|
|
jsr clear_bottom
|
|
|
|
rts
|
|
|
|
;==========
|
|
; page_flip
|
|
;==========
|
|
|
|
page_flip:
|
|
lda DISP_PAGE ; 3
|
|
beq page_flip_show_1 ; 2nt/3
|
|
page_flip_show_0:
|
|
; bit PAGE0 ; 4
|
|
; lda #4 ; 2
|
|
lda #0
|
|
sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
|
|
lda #0 ; 2
|
|
sta DISP_PAGE ; DISP_PAGE=0 ; 3
|
|
rts ; 6
|
|
page_flip_show_1:
|
|
; bit PAGE1 ; 4
|
|
lda #0
|
|
sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
|
|
lda #1 ; 2
|
|
sta DISP_PAGE ; DISP_PAGE=1 ; 3
|
|
rts ; 6
|
|
;====================
|
|
; DISP_PAGE=0 26
|
|
; DISP_PAGE=1 24
|
|
|
|
;======================
|
|
; memset
|
|
;======================
|
|
; a=value
|
|
; x=length
|
|
; MEMPTRL/MEMPTRH is address
|
|
memset:
|
|
ldy #0
|
|
memset_loop:
|
|
sta MEMPTRL,Y
|
|
iny
|
|
dex
|
|
bne memset_loop
|
|
rts
|
|
|
|
|
|
;=================
|
|
; load RLE image
|
|
;=================
|
|
; Output is BASH/BASL
|
|
; Input is in GBASH/GBASL
|
|
load_rle_gr:
|
|
lda #$0
|
|
tax
|
|
tay ; init X and Y to 0
|
|
|
|
sta CV ; ycoord=0
|
|
|
|
lda (GBASL),y ; load xsize
|
|
sta CH
|
|
iny ; (we should check if we had
|
|
; bad luck and overflows page)
|
|
|
|
iny ; skip ysize
|
|
|
|
rle_loop:
|
|
lda (GBASL),y ; load run value
|
|
cmp #$ff ; if 0xff
|
|
beq rle_done ; we are done
|
|
sta RUN
|
|
iny ; point to next value
|
|
bne rle_yskip1 ; if overflow, increment address
|
|
inc GBASH
|
|
rle_yskip1:
|
|
lda (GBASL),y ; load value to write
|
|
iny
|
|
bne rle_yskip2
|
|
inc GBASH
|
|
rle_yskip2:
|
|
sty TEMP2 ; save y for later
|
|
pha
|
|
lda #$0
|
|
tay
|
|
pla ; convoluted way to set y to 0
|
|
|
|
rle_run_loop:
|
|
sta (BASL),y ; write out the value
|
|
inc BASL ; increment the pointer
|
|
bne rle_skip3 ; if wrapped
|
|
inc BASH ; then increment the high value
|
|
rle_skip3:
|
|
inx ; increment the X value
|
|
cpx CH ; compare against the image width
|
|
bcc rle_not_eol ; if less then keep going
|
|
|
|
pha ; save out value on stack
|
|
|
|
lda BASL ; cheat to avoid a 16-bit add
|
|
cmp #$a7 ; we are adding 0x58 to get
|
|
bcc rle_add_skip ; to the next line
|
|
inc BASH
|
|
rle_add_skip:
|
|
clc
|
|
adc #$58 ; actually do the 0x58 add
|
|
sta BASL ; and store it back
|
|
|
|
inc CV ; add 2 to ypos
|
|
inc CV ; each "line" is two high
|
|
|
|
lda CV ; load value
|
|
cmp #15 ; if it's greater than 14 it wraps
|
|
bcc rle_no_wrap ; Thanks Woz
|
|
|
|
lda #$0 ; we wrapped, so set to zero
|
|
sta CV
|
|
|
|
; when wrapping have to sub 0x3d8
|
|
sec ; this is a 16-bit subtract routine
|
|
lda BASL
|
|
sbc #$d8 ; LSB
|
|
sta BASL
|
|
lda BASH ; MSB
|
|
sbc #$3 ;
|
|
sta BASH
|
|
|
|
rle_no_wrap:
|
|
lda #$0 ; set X value back to zero
|
|
tax
|
|
pla ; restore value to write from stack
|
|
|
|
rle_not_eol:
|
|
dec RUN ; decrement run value
|
|
bne rle_run_loop ; if not zero, keep looping
|
|
|
|
ldy TEMP2 ; restore the input pointer
|
|
sec
|
|
bcs rle_loop ; and branch always
|
|
|
|
rle_done:
|
|
lda #$15 ; move the cursor somewhere sane
|
|
sta CV
|
|
rts
|
|
|
|
|
|
;==========================================================
|
|
; set_text_page0
|
|
;==========================================================
|
|
;
|
|
set_text_page0:
|
|
bit PAGE0 ; set page0
|
|
bit TEXT ; set text mode
|
|
rts
|
|
|
|
;==========================================================
|
|
; set_gr_page0
|
|
;==========================================================
|
|
;
|
|
set_gr_page0:
|
|
;lda #4
|
|
;sta GR_PAGE
|
|
bit PAGE0 ; set page 0
|
|
bit LORES ; Lo-res graphics
|
|
bit TEXTGR ; mixed gr/text mode
|
|
bit SET_GR ; set graphics
|
|
rts
|
|
|
|
;=========================================================
|
|
; gr_copy_to_current
|
|
;=========================================================
|
|
; copy 0xc00 to DRAW_PAGE
|
|
; 2 + 8*38 + 4*80*23 + 4*120*26 + 13 = 20,159 = 20ms = 50Hz
|
|
;
|
|
gr_copy_to_current:
|
|
ldx #0 ; set y to zero ; 2
|
|
|
|
gr_copy_loop:
|
|
stx TEMP ; save y ; 3
|
|
txa ; move to A ; 2
|
|
asl ; mult by 2 ; 2
|
|
tay ; put into Y ; 2
|
|
lda gr_offsets,Y ; lookup low byte for line addr ; 5
|
|
sta OUTL ; out and in are the same ; 3
|
|
sta INL ; 3
|
|
lda gr_offsets+1,Y ; lookup high byte for line addr ; 5
|
|
adc DRAW_PAGE
|
|
sta OUTH ; 3
|
|
lda gr_offsets+1,Y ; lookup high byte for line addr ; 5
|
|
adc #$8 ; for now, fixed 0xc ; 2
|
|
sta INH ; 3
|
|
ldx TEMP ; restore y ; 3
|
|
|
|
ldy #0 ; set X counter to 0 ; 2
|
|
gr_copy_line:
|
|
lda (INL),Y ; load a byte ; 5
|
|
sta (OUTL),Y ; store a byte ; 6
|
|
iny ; increment pointer ; 2
|
|
|
|
cpx #$4 ; don't want to copy bottom 4*40 ; 2
|
|
bcs gr_copy_above4 ; 3
|
|
|
|
gr_copy_below4:
|
|
cpy #120 ; for early ones, copy 120 bytes ; 2
|
|
bne gr_copy_line ; 3
|
|
beq gr_copy_line_done ; 3
|
|
|
|
gr_copy_above4: ; for last four, just copy 80 bytes
|
|
cpy #80 ; 2
|
|
bne gr_copy_line ; 3
|
|
|
|
gr_copy_line_done:
|
|
inx ; increment y value ; 2
|
|
cpx #8 ; there are 8 of them ; 2
|
|
bne gr_copy_loop ; if not, loop ; 3
|
|
rts ; 6
|
|
|
|
;==========================================================
|
|
; Wait until keypressed
|
|
;==========================================================
|
|
;
|
|
|
|
wait_until_keypressed:
|
|
lda KEYPRESS ; check if keypressed
|
|
bpl wait_until_keypressed ; if not, loop
|
|
jmp figure_out_key
|
|
|
|
|
|
;==========================================================
|
|
; Get Key
|
|
;==========================================================
|
|
;
|
|
|
|
get_key:
|
|
|
|
check_paddle_button:
|
|
|
|
; check for paddle button
|
|
|
|
bit PADDLE_BUTTON0 ; 4
|
|
bpl no_button ; 2nt/3
|
|
lda #' '+128 ; 2
|
|
jmp save_key ; 3
|
|
|
|
no_button:
|
|
lda KEYPRESS ; 3
|
|
bpl no_key ; 2nt/3
|
|
|
|
figure_out_key:
|
|
cmp #' '+128 ; the mask destroys space ; 2
|
|
beq save_key ; so handle it specially ; 2nt/3
|
|
|
|
and #$5f ; mask, to make upper-case ; 2
|
|
check_right_arrow:
|
|
cmp #$15 ; 2
|
|
bne check_left_arrow ; 2nt/3
|
|
lda #'D' ; 2
|
|
check_left_arrow:
|
|
cmp #$08 ; 2
|
|
bne check_up_arrow ; 2nt/3
|
|
lda #'A' ; 2
|
|
check_up_arrow:
|
|
cmp #$0B ; 2
|
|
bne check_down_arrow ; 2nt/3
|
|
lda #'W' ; 2
|
|
check_down_arrow:
|
|
cmp #$0A ; 2
|
|
bne check_escape ; 2nt/3
|
|
lda #'S' ; 2
|
|
check_escape:
|
|
cmp #$1B ; 2
|
|
bne save_key ; 2nt/3
|
|
lda #'Q' ; 2
|
|
jmp save_key ; 3
|
|
|
|
no_key:
|
|
bit PADDLE_STATUS ; 3
|
|
bpl no_key_store ; 2nt/3
|
|
|
|
; check for paddle action
|
|
; code from http://web.pdx.edu/~heiss/technotes/aiie/tn.aiie.06.html
|
|
|
|
inc PADDLE_STATUS ; 5
|
|
lda PADDLE_STATUS ; 3
|
|
and #$03 ; 2
|
|
beq check_paddles ; 2nt/3
|
|
jmp no_key_store ; 3
|
|
|
|
check_paddles:
|
|
lda PADDLE_STATUS ; 3
|
|
and #$80 ; 2
|
|
sta PADDLE_STATUS ; 3
|
|
|
|
ldx #$0 ; 2
|
|
LDA PTRIG ;TRIGGER PADDLES ; 4
|
|
LDY #0 ;INIT COUNTER ; 2
|
|
NOP ;COMPENSATE FOR 1ST COUNT ; 2
|
|
NOP ; 2
|
|
PREAD2: LDA PADDL0,X ;COUNT EVERY 11 uSEC. ; 4
|
|
BPL RTS2D ;BRANCH WHEN TIMED OUT ; 2nt/3
|
|
INY ;INCREMENT COUNTER ; 2
|
|
BNE PREAD2 ;CONTINUE COUNTING ; 2nt/3
|
|
DEY ;COUNTER OVERFLOWED ; 2
|
|
RTS2D: ;RETURN W/VALUE 0-255
|
|
|
|
cpy #96 ; 2
|
|
bmi paddle_left ; 2nt/3
|
|
cpy #160 ; 2
|
|
bmi no_key_store ; 2nt/3
|
|
lda #'D' ; 2
|
|
jmp save_key ; 3
|
|
paddle_left:
|
|
lda #'A' ; 2
|
|
jmp save_key ; 3
|
|
|
|
no_key_store:
|
|
lda #0 ; no key, so save a zero ; 2
|
|
|
|
save_key:
|
|
sta LASTKEY ; save the key to our buffer ; 2
|
|
bit KEYRESET ; clear the keyboard buffer ; 4
|
|
rts ; 6
|
|
;============
|
|
; 33=nokey
|
|
; 48=worstkey
|
|
|
|
|
|
;=============================================
|
|
; put_sprite
|
|
;=============================================
|
|
; Sprite to display in INH,INL
|
|
; Location is XPOS,YPOS
|
|
; Note, only works if YPOS is multiple of two?
|
|
|
|
put_sprite:
|
|
|
|
ldy #0 ; byte 0 is xsize ; 2
|
|
lda (INL),Y ; 5
|
|
sta CH ; xsize is in CH ; 3
|
|
iny ; 2
|
|
|
|
lda (INL),Y ; byte 1 is ysize ; 5
|
|
sta CV ; ysize is in CV ; 3
|
|
iny ; 2
|
|
|
|
lda YPOS ; make a copy of ypos ; 3
|
|
sta TEMPY ; as we modify it ; 3
|
|
;===========
|
|
; 28
|
|
put_sprite_loop:
|
|
sty TEMP ; save sprite pointer ; 3
|
|
|
|
ldy TEMPY ; 3
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 5
|
|
clc ; 2
|
|
adc XPOS ; add in xpos ; 3
|
|
sta OUTL ; store out low byte of addy ; 3
|
|
lda gr_offsets+1,Y ; look up high byte ; 5
|
|
adc DRAW_PAGE ; ; 3
|
|
sta OUTH ; and store it out ; 3
|
|
ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
; OUTH:OUTL now points at right place
|
|
|
|
ldx CH ; load xsize into x ; 3
|
|
;===========
|
|
; 36
|
|
put_sprite_pixel:
|
|
lda (INL),Y ; get sprite colors ; 5
|
|
iny ; increment sprite pointer ; 2
|
|
|
|
sty TEMP ; save sprite pointer ; 3
|
|
ldy #$0 ; 2
|
|
|
|
; check if completely transparent
|
|
; if so, skip
|
|
|
|
cmp #$0 ; if all zero, transparent ; 2
|
|
beq put_sprite_done_draw ; don't draw it ; 2nt/3
|
|
; FIXME: use BIT? ;==============
|
|
; 17
|
|
|
|
sta COLOR ; save color for later ; 3
|
|
|
|
; check if top pixel transparent
|
|
|
|
and #$f0 ; check if top nibble zero ; 2
|
|
bne put_sprite_bottom ; if not skip ahead ; 2nt/3
|
|
|
|
lda #$f0 ; setup mask ; 2
|
|
sta MASK ; 3
|
|
bmi put_sprite_mask ; 2nt/3
|
|
|
|
put_sprite_bottom:
|
|
lda COLOR ; re-load color ; 3
|
|
and #$0f ; check if bottom nibble zero ; 2
|
|
bne put_sprite_all ; if not, skip ahead ; 2nt/3
|
|
lda #$0f ; 2
|
|
sta MASK ; setup mask ; 3
|
|
|
|
put_sprite_mask:
|
|
lda (OUTL),Y ; get color at output ; 5
|
|
and MASK ; mask off unneeded part ; 3
|
|
ora COLOR ; or the color in ; 3
|
|
sta (OUTL),Y ; store it back ; 5
|
|
|
|
jmp put_sprite_done_draw ; we are done ; 3
|
|
|
|
put_sprite_all:
|
|
lda COLOR ; load color ; 3
|
|
sta (OUTL),Y ; and write it out ; 5
|
|
|
|
|
|
put_sprite_done_draw:
|
|
|
|
ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
inc OUTL ; increment output pointer ; 5
|
|
dex ; decrement x counter ; 2
|
|
bne put_sprite_pixel ; if not done, keep looping ; 2nt/3
|
|
|
|
inc TEMPY ; each line has two y vars ; 5
|
|
inc TEMPY ; 5
|
|
dec CV ; decemenet total y count ; 5
|
|
bne put_sprite_loop ; loop if not done ; 2nt/3
|
|
|
|
rts ; return ; 6
|
|
|
|
|
|
;================================
|
|
; htab_vtab
|
|
;================================
|
|
; move to CH/CV
|
|
htab_vtab:
|
|
lda CV
|
|
asl
|
|
tay
|
|
lda gr_offsets,Y ; lookup low-res memory address
|
|
clc
|
|
adc CH ; add in xpos
|
|
sta BASL ; store out low byte of addy
|
|
|
|
lda gr_offsets+1,Y ; look up high byte
|
|
adc DRAW_PAGE ;
|
|
sta BASH ; and store it out
|
|
; BASH:BASL now points at right place
|
|
|
|
rts
|
|
|
|
;================================
|
|
; move_and_print
|
|
;================================
|
|
; move to CH/CV
|
|
move_and_print:
|
|
jsr htab_vtab
|
|
|
|
;================================
|
|
; print_string
|
|
;================================
|
|
|
|
print_string:
|
|
ldy #0
|
|
print_string_loop:
|
|
lda (OUTL),Y
|
|
beq done_print_string
|
|
ora #$80
|
|
sta (BASL),Y
|
|
iny
|
|
bne print_string_loop
|
|
done_print_string:
|
|
rts
|
|
|
|
;====================
|
|
; point_to_end_string
|
|
;====================
|
|
point_to_end_string:
|
|
iny
|
|
tya
|
|
clc
|
|
adc OUTL
|
|
sta OUTL
|
|
lda #0
|
|
adc OUTH
|
|
sta OUTH
|
|
|
|
rts
|
|
|
|
|
|
;================================
|
|
; print_both_pages
|
|
;================================
|
|
print_both_pages:
|
|
lda DRAW_PAGE
|
|
pha
|
|
|
|
lda #4
|
|
sta DRAW_PAGE
|
|
jsr move_and_print
|
|
|
|
; lda #8
|
|
; sta DRAW_PAGE
|
|
; jsr move_and_print
|
|
|
|
pla
|
|
sta DRAW_PAGE
|
|
|
|
rts ; oops forgot this initially
|
|
; explains the weird vertical stripes on the screen
|
|
|
|
;=========================================
|
|
; vlin
|
|
;=========================================
|
|
; X, V2 at Y
|
|
vlin:
|
|
|
|
sty TEMPY ; save Y (x location)
|
|
vlin_loop:
|
|
|
|
txa ; a=x (get first y)
|
|
and #$fe ; Clear bottom bit
|
|
tay ;
|
|
lda gr_offsets,Y ; lookup low-res memory address low
|
|
sta GBASL ; put it into our indirect pointer
|
|
iny
|
|
lda gr_offsets,Y ; lookup low-res memory address high
|
|
clc
|
|
adc DRAW_PAGE ; add in draw page offset
|
|
sta GBASH ; put into top of indirect
|
|
|
|
ldy TEMPY ; load back in y (x offset)
|
|
|
|
txa ; load back in x (current y)
|
|
lsr ; check the low bit
|
|
bcc vlin_low ; if not set, skip to low
|
|
|
|
vlin_high:
|
|
lda #$F0 ; setup masks
|
|
sta MASK
|
|
lda #$0f
|
|
bcs vlin_too_slow
|
|
|
|
vlin_low: ; setup masks
|
|
lda #$0f
|
|
sta MASK
|
|
lda #$f0
|
|
vlin_too_slow:
|
|
|
|
and (GBASL),Y ; mask current byte
|
|
sta (GBASL),Y ; and store back
|
|
|
|
lda MASK ; mask the color
|
|
and COLOR
|
|
ora (GBASL),Y ; or into the right place
|
|
sta (GBASL),Y ; store it
|
|
|
|
inx ; increment X (current y)
|
|
cpx V2 ; compare to the limit
|
|
bcc vlin_loop ; if <= then loop
|
|
|
|
rts ; return
|
|
|
|
|
|
;================================
|
|
; hlin_setup
|
|
;================================
|
|
; put address in GBASL/GBASH
|
|
; Ycoord in A, Xcoord in Y
|
|
hlin_setup:
|
|
sty TEMPY ; 3
|
|
tay ; y=A ; 2
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
|
clc ; 2
|
|
adc TEMPY ; 3
|
|
sta GBASL ; 3
|
|
iny ; 2
|
|
|
|
lda gr_offsets,Y ; 4
|
|
adc DRAW_PAGE ; add in draw page offset ; 3
|
|
sta GBASH ; 3
|
|
rts ; 6
|
|
;===========
|
|
; 35
|
|
;================================
|
|
; hlin_double:
|
|
;================================
|
|
; HLIN Y, V2 AT A
|
|
; Y, X, A trashed
|
|
; start at Y, draw up to and including X
|
|
hlin_double:
|
|
;int hlin_double(int page, int x1, int x2, int at) {
|
|
|
|
jsr hlin_setup ; 41
|
|
|
|
sec ; 2
|
|
lda V2 ; 3
|
|
sbc TEMPY ; 3
|
|
|
|
tax ; 2
|
|
inx ; 2
|
|
;===========
|
|
; 53
|
|
; fallthrough
|
|
|
|
;=================================
|
|
; hlin_double_continue: width
|
|
;=================================
|
|
; width in X
|
|
|
|
hlin_double_continue:
|
|
|
|
ldy #0 ; 2
|
|
lda COLOR ; 3
|
|
hlin_double_loop:
|
|
sta (GBASL),Y ; 6
|
|
inc GBASL ; 5
|
|
dex ; 2
|
|
bne hlin_double_loop ; 2nt/3
|
|
|
|
rts ; 6
|
|
;=============
|
|
; 53+5+X*16+5
|
|
|
|
;================================
|
|
; hlin_single:
|
|
;================================
|
|
; HLIN Y, V2 AT A
|
|
; Y, X, A trashed
|
|
hlin_single:
|
|
|
|
jsr hlin_setup
|
|
|
|
sec
|
|
lda V2
|
|
sbc TEMPY
|
|
|
|
tax
|
|
|
|
; fallthrough
|
|
|
|
;=================================
|
|
; hlin_single_continue: width
|
|
;=================================
|
|
; width in X
|
|
|
|
hlin_single_continue:
|
|
|
|
hlin_single_top:
|
|
lda COLOR
|
|
and #$f0
|
|
sta COLOR
|
|
|
|
hlin_single_top_loop:
|
|
ldy #0
|
|
lda (GBASL),Y
|
|
and #$0f
|
|
ora COLOR
|
|
sta (GBASL),Y
|
|
inc GBASL
|
|
dex
|
|
bne hlin_single_top_loop
|
|
|
|
rts
|
|
|
|
hlin_single_bottom:
|
|
|
|
lda COLOR
|
|
and #$0f
|
|
sta COLOR
|
|
|
|
hlin_single_bottom_loop:
|
|
ldy #0
|
|
lda (GBASL),Y
|
|
and #$f0
|
|
sta (GBASL),Y
|
|
inc GBASL
|
|
dex
|
|
bne hlin_single_bottom_loop
|
|
|
|
rts
|
|
|
|
|
|
;=============================
|
|
; clear_top
|
|
;=============================
|
|
clear_top:
|
|
lda #$00
|
|
|
|
;=============================
|
|
; clear_top_a
|
|
;=============================
|
|
clear_top_a:
|
|
|
|
sta COLOR
|
|
|
|
; VLIN Y, V2 AT A
|
|
|
|
lda #40
|
|
sta V2
|
|
|
|
lda #0
|
|
|
|
clear_top_loop:
|
|
ldy #0
|
|
pha
|
|
|
|
jsr hlin_double
|
|
|
|
pla
|
|
clc
|
|
adc #$2
|
|
cmp #40
|
|
bne clear_top_loop
|
|
|
|
rts
|
|
|
|
;=====================
|
|
; clear bottom
|
|
;=====================
|
|
clear_bottom:
|
|
lda #$a0 ; NORMAL space
|
|
sta COLOR
|
|
|
|
lda #40
|
|
sta V2
|
|
|
|
clear_bottom_loop:
|
|
ldy #0
|
|
pha
|
|
|
|
jsr hlin_double
|
|
|
|
pla
|
|
clc
|
|
adc #$2
|
|
cmp #48
|
|
bne clear_bottom_loop
|
|
|
|
rts
|
|
|
|
;==========================
|
|
; copy_page1_to_page0
|
|
;==========================
|
|
; x trashed
|
|
|
|
copy_page1_to_page0:
|
|
bit PAGE0
|
|
ldx #120 ; 2
|
|
copy_p1p0_loop:
|
|
lda $800,X ; 4
|
|
sta $400,X ; 4
|
|
lda $880,X ; 4
|
|
sta $480,X ; 4
|
|
lda $900,X ; 4
|
|
sta $500,X ; 4
|
|
lda $980,X ; 4
|
|
sta $580,X ; 4
|
|
lda $a00,X ; 4
|
|
sta $600,X ; 4
|
|
lda $A80,X ; 4
|
|
sta $680,X ; 4
|
|
lda $B00,X ; 4
|
|
sta $700,X ; 4
|
|
lda $B80,X ; 4
|
|
sta $780,X ; 4
|
|
dex ; 2
|
|
bpl copy_p1p0_loop ; 2nt/3
|
|
rts ; 6
|
|
; 2+ [((16*4)+2+3)*120] +5
|
|
; 8287
|
|
|
|
|
|
;==========================
|
|
; copy_page2_to_aux
|
|
;==========================
|
|
; x trashed
|
|
|
|
copy_page2_to_aux:
|
|
bit PAGE1
|
|
ldx #120 ; 2
|
|
copy_p2aux_loop:
|
|
lda $C00,X ; 4
|
|
sta $400,X ; 4
|
|
lda $C80,X ; 4
|
|
sta $480,X ; 4
|
|
lda $D00,X ; 4
|
|
sta $500,X ; 4
|
|
lda $D80,X ; 4
|
|
sta $580,X ; 4
|
|
lda $E00,X ; 4
|
|
sta $600,X ; 4
|
|
lda $E80,X ; 4
|
|
sta $680,X ; 4
|
|
lda $F00,X ; 4
|
|
sta $700,X ; 4
|
|
lda $F80,X ; 4
|
|
sta $780,X ; 4
|
|
dex ; 2
|
|
bpl copy_p2aux_loop ; 2nt/3
|
|
rts ; 6
|
|
; 4+2+ [((16*4)+2+3)*120] +5
|
|
; 8287
|