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starring: cycle counting

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jmp into middle of a bit instruction
This commit is contained in:
Vince Weaver 2018-09-30 23:07:57 -04:00
parent 32b216a7c0
commit ec8063aec3
3 changed files with 299 additions and 76 deletions
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3
megademo/README
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@ -22,6 +22,9 @@ Starring:
at 60Hz. Also could flip between 4 pages, but need the 8k of at 60Hz. Also could flip between 4 pages, but need the 8k of
HGR page2. HGR page2.
For cycle-counting timing, jmp one into a bit $C055 instruction
which is EOR $C0,X (4 cycles)
E-mail: E-mail:
Half screen text, half 40x96 lores. Half screen text, half 40x96 lores.
Text is also interlaced top/bottom to create new chars (including Text is also interlaced top/bottom to create new chars (including

156
megademo/starring.s
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@ -16,6 +16,7 @@ starring:
; init vars ; init vars
lda #0 lda #0
sta FRAME
sta DRAW_PAGE sta DRAW_PAGE
;============================= ;=============================
@ -98,99 +99,105 @@ stloopB:dex ; 2
dey ; 2 dey ; 2
bne stloopA ; 2nt/3 bne stloopA ; 2nt/3
jmp st_begin_loop jmp st_display_loop
.align $100 .align $100
;================================================ ;================================================
; Starring Loop ; Starring Loop
;================================================ ;================================================
; each scan line 65 cycles ; just kill time, 65*192 = 12480
; 1 cycle each byte (40cycles) + 25 for horizontal
; Total of 12480 cycles to draw screen
; Vertical blank = 4550 cycles (70 scan lines)
; Total of 17030 cycles to get back to where was
; G00000000000000000000 H0000000000000000000000
st_begin_loop:
st_display_loop: st_display_loop:
ldy #24 ; Try X=15 Y=154 cycles=12475 R5
st_outer_loop:
;== line0 nop ; 2
bit PAGE0 ; 4 lda $0 ; 3
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line1
bit PAGE0 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line2
bit PAGE0 ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line3
bit PAGE1 ;IIe ; 4
; bit PAGE0 ;II/II+ ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line4
bit PAGE1 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line5
bit PAGE1 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line6
bit PAGE1 ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line7
bit PAGE1 ; 4
lda #$55 ; 2
sta draw_line_p2+1 ; 4
jsr draw_line_2 ; 6
dey ; 2
bne st_outer_loop ; 3
; -1
ldy #154 ; 2
suloop1:ldx #15 ; 2
suloop2:dex ; 2
bne suloop2 ; 2nt/3
dey ; 2
bne suloop1 ; 2nt/3
;====================================================== ;======================================================
; We have 4550 cycles in the vblank, use them wisely ; We have 4550 cycles in the vblank, use them wisely
;====================================================== ;======================================================
; we want to flip between GR Page0, GR Page1, HGR Page0
; we want to flip at roughly 3Hz, so every 20 times through
; what if 16, for power-of-two easiness? 3.75Hz?
; FRAME== 0 GR/PAGE0
; FRAME==20 GR/PAGE1
; FRAME==40 HGR/PAGE0
; FRAME==60 reset
; default = 13+5+5+7 = 30
; sixty = 13+17 = 30
; forty = 13+5+12 = 30
; twenty = 13+5+5+7 = 30
inc FRAME ; 5
lda FRAME ; 3
cmp #60 ; 2
bne st_not_sixty ; 3
;===========
; 13
st_sixty: ; -1
lda #0 ; wrap frame counter ; 2
sta FRAME ; 3
bit LORES ; 4
bit PAGE0 ; 4
nop ; 2
jmp done_st_vblank ; 3
;===========
; 17
st_not_sixty:
cmp #20 ; 2
bne st_not_twenty ; 3
;============
; 5
st_twenty: ; -1
bit LORES ; 4
nop ; 2
st_seven_cycles:
bit PAGE1 ; 2C 55 C0, 55C0 = EOR $20,X (4 cyc) ; 4
jmp done_st_vblank ; 3
;============
; 12
st_not_twenty:
cmp #40 ; 2
bne st_seven_cycles+1 ; 3
;============
; 5
st_forty: ; -1
bit HIRES ; 4
bit PAGE0 ; 4
;============
; 7
done_st_vblank:
; do_nothing should be 4550 ; do_nothing should be 4550
; +1 fallthrough from above
; -10 keypress ; -10 keypress
; -2 ldy at top ; -30 page flipping
; -132 move letters
; =========== ; ===========
; 4407 ; 4407
; Try X=13 Y=62 cycles=4403 R4 ; Try X=99 Y=9 cycles=4510
nop ; 2 ldy #9 ; 2
nop stloop1:ldx #99 ; 2
ldy #62 ; 2
stloop1:ldx #13 ; 2
stloop2:dex ; 2 stloop2:dex ; 2
bne stloop2 ; 2nt/3 bne stloop2 ; 2nt/3
dey ; 2 dey ; 2
@ -198,6 +205,7 @@ stloop2:dex ; 2
lda KEYPRESS ; 4 lda KEYPRESS ; 4
bpl st_no_keypress ; 3 bpl st_no_keypress ; 3
jmp st_start_over jmp st_start_over
st_no_keypress: st_no_keypress:
@ -207,10 +215,6 @@ st_start_over:
bit KEYRESET ; clear keypress ; 4 bit KEYRESET ; clear keypress ; 4
rts ; 6 rts ; 6
.include "starring1.inc" .include "starring1.inc"
.include "starring2.inc" .include "starring2.inc"

216
megademo/starring_people.s Normal file
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@ -0,0 +1,216 @@
; Display Starring Message
; 1st screen = triple page flip
; 2nd/3rd = split low/hires
starring:
;===================
; init screen
jsr TEXT
jsr HOME
bit KEYRESET
;===================
; init vars
lda #0
sta DRAW_PAGE
;=============================
; Load graphic page0
lda #$0c
sta BASH
lda #$00
sta BASL ; load image to $c00
lda #<starring1
sta GBASL
lda #>starring1
sta GBASH
jsr load_rle_gr
lda #4
sta DRAW_PAGE
jsr gr_copy_to_current ; copy to page1
; GR part
bit PAGE1
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
;=============================
; Load graphic page1
lda #$0c
sta BASH
lda #$00
sta BASL ; load image to $c00
lda #<starring2
sta GBASL
lda #>starring2
sta GBASH
jsr load_rle_gr
lda #0
sta DRAW_PAGE
jsr gr_copy_to_current
; GR part
bit PAGE0
;==============================
; setup graphics for vapor lock
;==============================
jsr vapor_lock ; 6
; vapor lock returns with us at beginning of hsync in line
; 114 (7410 cycles), so with 5070 lines to go
jsr gr_copy_to_current ; 6+ 9292
; now we have 322 left
; GR part
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
; 322 - 12 = 310
; - 3 for jmp
; 307
; Try X=9 Y=6 cycles=307
ldy #6 ; 2
stloopA:ldx #9 ; 2
stloopB:dex ; 2
bne stloopB ; 2nt/3
dey ; 2
bne stloopA ; 2nt/3
jmp st_begin_loop
.align $100
;================================================
; Starring Loop
;================================================
; each scan line 65 cycles
; 1 cycle each byte (40cycles) + 25 for horizontal
; Total of 12480 cycles to draw screen
; Vertical blank = 4550 cycles (70 scan lines)
; Total of 17030 cycles to get back to where was
; G00000000000000000000 H0000000000000000000000
st_begin_loop:
st_display_loop:
ldy #24
st_outer_loop:
;== line0
bit PAGE0 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line1
bit PAGE0 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line2
bit PAGE0 ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line3
bit PAGE1 ;IIe ; 4
; bit PAGE0 ;II/II+ ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line4
bit PAGE1 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line5
bit PAGE1 ; 4
lda #$54 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line6
bit PAGE1 ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line7
bit PAGE1 ; 4
lda #$55 ; 2
sta draw_line_p2+1 ; 4
jsr draw_line_2 ; 6
dey ; 2
bne st_outer_loop ; 3
; -1
;======================================================
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; do_nothing should be 4550
; +1 fallthrough from above
; -10 keypress
; -2 ldy at top
; -132 move letters
; ===========
; 4407
; Try X=13 Y=62 cycles=4403 R4
nop ; 2
nop
ldy #62 ; 2
stloop1:ldx #13 ; 2
stloop2:dex ; 2
bne stloop2 ; 2nt/3
dey ; 2
bne stloop1 ; 2nt/3
lda KEYPRESS ; 4
bpl st_no_keypress ; 3
jmp st_start_over
st_no_keypress:
jmp st_display_loop ; 3
st_start_over:
bit KEYRESET ; clear keypress ; 4
rts ; 6
.include "starring1.inc"
.include "starring2.inc"