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keen1: more cycle counting

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This commit is contained in:
Vince Weaver 2024-05-09 17:12:56 -04:00
parent 16ae738044
commit 4e0fdf6968
1 changed files with 77 additions and 30 deletions
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107
games/keen/story.s
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@ -206,10 +206,10 @@ check_keypress:
beq do_up_up ; 2/3
; 30
cmp #'S' ; 2
beq do_down ; 2/3
beq do_down_s ; 2/3
; 34
cmp #$0A ; 2
beq do_down ; 2/3
beq do_down_down ; 2/3
; 38
bne done_key41 ; bra ; 3
@ -228,16 +228,34 @@ done_key7:
nop
nop
done_key41:
inc $00
inc $00 ; nop5
lda $00 ; nop3
done_key_49:
inc $00 ; nop5
lda $00 ; nop3
done_key_57:
inc $00 ; nop5
inc $00 ; nop5
nop
done_key_69:
inc $00 ; nop5
nop
done_key_76:
; 18*8*65= 9360
; want to delay 9360 - 41 - 7 - 4 = 9308 - 20 = 9288/9 = 1032
; 1032/256= 4 r 8
; 11623+76 = 11699
; want to delay total of 144+70 lines, 214
; 214*65 = 13910
; -11699
; =========
; 2211
; want to delay 2211 - 4 = 2207 - 20 = 2187/9 = 243
; 243/256= 0 r 243
;
lda #4 ; 2
ldy #8 ; 2
lda #0 ; 2
ldy #243 ; 2
jsr delay_loop
; want to delay 6*8*65 = 3120+4550 = 7670
@ -255,10 +273,14 @@ done_key41:
jsr delay_loop
bit SET_TEXT ; 4
done_key:
;done_key:
jmp draw_loop ; 3
;=================================
; handle up pressed
;=================================
do_up_w:
; 27
nop
@ -271,7 +293,7 @@ do_up_up:
; 38
lda START_LINE_L ; 3
cmp #<story_data ; 2
beq up_done ; 2/3
beq up_done_46 ; 2/3
bne up_ok_ok ; bra ; 3
; 48
@ -285,58 +307,83 @@ up_ok:
up_ok_ok:
sec ; 2
lda START_LINE_L ; 3
beq to_prev_page
sbc #40
jmp up_done
beq to_prev_page ; 2/3
; 55
ldy $0 ; nop3 ; 3
sbc #40 ; 2
jmp up_done ; 3
; 63
to_prev_page:
dec START_LINE_H
lda #200
; 56
dec START_LINE_H ; 5
lda #200 ; 2
up_done:
; 63 / 63
sta START_LINE_L ; 3
jmp done_key_69 ; 3
; 61
up_done_46:
jmp done_key_49 ; 3
;=================================
; handle down pressed
;=================================
; 46
jmp done_key
do_down:
do_down_s:
; 35
nop
nop
do_down_down:
; 39
lda START_LINE_H ; 3
cmp #>story_end ; 2
bne down_ok ; 2/3
; 46
lda START_LINE_L ; 3
cmp #<story_end ; 2
beq done_key ; 2/3
beq down_done ; 2/3
; 53
bne down_ok_ok ; bra ; 3
; 47
down_ok:
lda $0 ; nop5
nop ; nop2
nop ; nop2
down_ok_ok:
; 56
; increment input row
; we don't want to cross a page so if we are
; 200 then skip to next page
; -1
lda START_LINE_L ; 3
cmp #200 ; 2
beq to_next_page ; 2/3
; 6
; 63
ldy $0 ; nop3 ; 3
clc ; 2
adc #40 ; 2
bne down_done ; bra ; 3
; 16
; 73
to_next_page:
; 7
; 64
inc START_LINE_H ; 5
lda #0 ; 2
nop
; 16
nop ; 2
; 73 / 73
down_done:
sta START_LINE_L ; 3
jmp draw_loop ; 3
jmp done_key_76 ; 3
early_down_done:
; 54
jmp done_key_57 ; 3
real_done_with_story: