mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-27 17:29:49 +00:00
a8ab24004d
need to change a bunch to make this work Now load at $4000 as was too big to fit between $1000 and $2000 also turns out our lz4 code was writing past the end, which you notice when you have important code right after the end of HGR1
281 lines
4.9 KiB
ArmAsm
281 lines
4.9 KiB
ArmAsm
|
|
HGR_SHAPE = $1A
|
|
HGR_SHAPE_H = $1B
|
|
HGR_BITS = $1C
|
|
HGR_COUNT = $1D
|
|
|
|
HMASK = $30
|
|
|
|
DSCTMP = $9D
|
|
|
|
HGR_DX = $D0
|
|
HGR_DX_H = $D1
|
|
HGR_DY = $D2
|
|
HGR_QUADRANT = $D3
|
|
HGR_E = $D4
|
|
HGR_E_H = $D5
|
|
HGR_X = $E0
|
|
HGR_X_H = $E1
|
|
HGR_Y = $E2
|
|
;HGR_COLOR = $E4
|
|
HGR_HORIZ = $E5
|
|
HGR_PAGE = $E6
|
|
|
|
|
|
TXTCLR = $C050
|
|
MIXSET = $C053
|
|
LOWSCR = $C054
|
|
MIXCLR = $C052
|
|
HISCR = $C055
|
|
|
|
|
|
.align $100
|
|
|
|
;==========================
|
|
; HGR
|
|
;==========================
|
|
hgr:
|
|
; F3E2
|
|
lda #$20 ; HIRES Page 1 at $2000
|
|
bit LOWSCR ; BIT SW.LOWSCR Use PAGE1 ($C054)
|
|
bit MIXSET ; BIT SW.MIXSET (Mixed text)
|
|
sethpg:
|
|
; F3EA
|
|
sta HGR_PAGE
|
|
lda HIRES
|
|
lda TXTCLR
|
|
hclr:
|
|
lda #0 ; black background
|
|
sta HGR_BITS
|
|
bkgnd:
|
|
; F3F6
|
|
lda HGR_PAGE
|
|
sta HGR_SHAPE+1
|
|
ldy #0
|
|
sty HGR_SHAPE
|
|
bkgnd_loop:
|
|
lda HGR_BITS
|
|
|
|
sta (HGR_SHAPE),y
|
|
|
|
jsr color_shift
|
|
|
|
iny
|
|
bne bkgnd_loop
|
|
|
|
inc HGR_SHAPE+1
|
|
lda HGR_SHAPE+1
|
|
and #$1f ; see if $40 or $60
|
|
bne bkgnd_loop
|
|
rts
|
|
|
|
|
|
msktbl: .byte $81,$82,$84,$88,$90,$A0,$C0 ; original
|
|
|
|
;====================================================
|
|
; HPOSN
|
|
; time = 9 + 61 + 31 + 22 + 42 + 22 + 23 = 210
|
|
|
|
hposn:
|
|
; F411: move values into expected zp locations
|
|
sta HGR_Y ; 3
|
|
stx HGR_X ; 3
|
|
sty HGR_X+1 ; 3
|
|
;===========
|
|
; 9
|
|
|
|
; calc y-position addr. no lookup table?
|
|
pha ; 3
|
|
and #$C0 ; 2
|
|
sta GBASL ; 3
|
|
lsr ; 2
|
|
lsr ; 2
|
|
ora GBASL ; 3
|
|
sta GBASL ; 3
|
|
pla ; 4
|
|
sta GBASH ; 3
|
|
asl ; 2
|
|
asl ; 2
|
|
asl ; 2
|
|
rol GBASH ; 5
|
|
asl ; 2
|
|
rol GBASH ; 5
|
|
asl ; 2
|
|
ror GBASL ; 5
|
|
lda GBASH ; 3
|
|
and #$1f ; 2
|
|
ora HGR_PAGE ; 3
|
|
sta GBASH ; 3
|
|
;============
|
|
; 61
|
|
; F438
|
|
; divide/mod 16-bit x poisition by 7
|
|
; incoming, X=(y,x)
|
|
; outgoing y=q, a=r
|
|
|
|
; Divide by 7 (From December '84 Apple Assembly Line)
|
|
|
|
txa ; 2
|
|
clc ; 2
|
|
sta HGR_HORIZ ; 3
|
|
lsr ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
adc HGR_HORIZ ; 3
|
|
ror ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
adc HGR_HORIZ ; 3
|
|
ror ; 2
|
|
lsr ; 2
|
|
lsr ; 2
|
|
; x/7 is in A
|
|
;============
|
|
; 31
|
|
; calculate remainder
|
|
clc ; 2
|
|
sta HGR_HORIZ ; 3
|
|
asl ; 2
|
|
adc HGR_HORIZ ; 3
|
|
asl ; 2
|
|
adc HGR_HORIZ ; 3
|
|
; HGR_HORIZ=x/7, A=HGR_HORIZ*7
|
|
; calculate remainder by X-(Q*7)
|
|
sec ; 2
|
|
eor #$ff ; 2
|
|
adc HGR_X ; 3
|
|
; A = remainder ;===========
|
|
; 22
|
|
;============================================================================
|
|
|
|
cpy #0 ; 2
|
|
beq done_mod_nop_23 ; 3
|
|
;==========
|
|
; 5
|
|
theres_high:
|
|
; -1
|
|
clc ; 2
|
|
adc #4 ; make remainder match ; 2
|
|
pha ; 3
|
|
lda HGR_HORIZ ; 3
|
|
adc #36 ; 2
|
|
sta HGR_HORIZ ; 3
|
|
pla ; 4
|
|
|
|
cmp #7 ; 2
|
|
bcc done_mod_nop14 ; blt ; 3
|
|
;============
|
|
; 23
|
|
|
|
|
|
; -1
|
|
sec ; 2
|
|
sbc #7 ; 2
|
|
inc HGR_HORIZ ; 5
|
|
ldy HGR_HORIZ ; nop ; 3
|
|
jmp done_mod ; 3
|
|
;============
|
|
; 14
|
|
;===========================
|
|
; Y=HIGH,bcc = 5+23+ 14 = 42
|
|
; Y=HIGH,bcs = 5+23+ 14 = 42
|
|
; Y=LOW = 5 + 14+23 = 42
|
|
|
|
done_mod_nop_23:
|
|
inc HGR_HORIZ,X ; (nop) ; 6
|
|
dec HGR_HORIZ,X ; (nop) ; 6
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
ldy HGR_HORIZ ; (nop) ; 3
|
|
nop ; 2
|
|
done_mod_nop14:
|
|
inc HGR_HORIZ,X ; (nop) ; 6
|
|
dec HGR_HORIZ,X ; (nop) ; 6
|
|
nop ; 2
|
|
|
|
done_mod:
|
|
ldy HGR_HORIZ ; 3
|
|
tax ; 2
|
|
lda msktbl,x ; 4+
|
|
|
|
sta HMASK ; 3
|
|
tya ; 2
|
|
lsr ; 2
|
|
lda HGR_COLOR ; 3
|
|
sta HGR_BITS ; 3
|
|
;===========
|
|
; 22
|
|
|
|
bcs color_shift ; 3
|
|
; cs = 3+20
|
|
;-1
|
|
|
|
; need 23 = 2+6+X = 15
|
|
inc HMASK,X ; nop ; 6
|
|
dec HMASK,X ; nop ; 6
|
|
lda HMASK ; nop ; 3
|
|
|
|
|
|
rts ; 6
|
|
;===========
|
|
; 23
|
|
|
|
;=====================================
|
|
; HPLOT0
|
|
;=====================================
|
|
; point in (YX),A
|
|
; 244 cycles
|
|
hplot0:
|
|
; F457
|
|
jsr hposn ; 6+210
|
|
lda HGR_BITS ; 3
|
|
eor (GBASL),y ; 5+
|
|
and HMASK ; 3
|
|
eor (GBASL),y ; 5+
|
|
sta (GBASL),y ; 6
|
|
rts ; 6
|
|
;============
|
|
; 244
|
|
|
|
;===================================
|
|
; COLOR_SHIFT
|
|
;===================================
|
|
; positive = 7+(7)+6 = 20
|
|
; negative = 7+ 7 +6 = 20
|
|
|
|
color_shift: ; F47E
|
|
asl ; 2
|
|
cmp #$c0 ; 2
|
|
|
|
bpl done_color_shift ; 3
|
|
; -1
|
|
lda HGR_BITS ; 3
|
|
eor #$7f ; 2
|
|
sta HGR_BITS ; 3
|
|
rts ; 6
|
|
done_color_shift:
|
|
lda HGR_BITS ; nop ; 3
|
|
nop ; 2
|
|
nop ; 2
|
|
rts ; 6
|
|
|
|
.align $100
|
|
|
|
;=============================
|
|
; HCOLOR_EQUALS
|
|
;=============================
|
|
; Color in X
|
|
; 13 cycles
|
|
hcolor_equals:
|
|
|
|
; F6E9
|
|
; TODO: mask to be less than 8
|
|
|
|
lda colortbl,x ; 4+
|
|
sta HGR_COLOR ; 3
|
|
rts ; 6
|
|
|
|
colortbl:
|
|
.byte $00,$2A,$55,$7F,$80,$AA,$D5,$FF
|
|
|