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entropy: more comments

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Vince Weaver 2018-05-28 01:32:17 -04:00
parent 8df4d4c3e3
commit de27045079
1 changed files with 13 additions and 14 deletions
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27
two-liners/entropy.s
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@ -115,21 +115,21 @@ xloop:
; SCALE=RND(1)*E*20+1
; EPOS is E*100, so RND(1)*(EPOS/10)*2+1
; put random value in FAC
; ldx #1 ; RND(1), Force 1, this set from earlier
jsr RND+6 ; skip arg parsing in RND
; put random value in FAC
; ldx #1 ; RND(1), Force 1, this set from earlier
jsr RND+6 ; skip arg parsing in RND
lda EPOS
jsr FLOAT ; convert value in A to float in FAC
jsr DIV10 ; FAC=FAC/10
jsr FLOAT ; convert value in A to float in FAC
jsr DIV10 ; FAC=FAC/10
ldy #>RND_EXP ; point (Y,A) to RND value
ldy #>RND_EXP ; point (Y,A) to RND value
lda #<RND_EXP
jsr FMULT ; multiply FAC by (Y,A)
jsr FMULT ; multiply FAC by (Y,A)
inc FAC_EXP ; multiply by 2
inc FAC_EXP ; multiply by 2
jsr CONINT ; convert to int (in X)
jsr CONINT ; convert to int (in X)
inx ; add 1
@ -168,11 +168,10 @@ nextx: ; NEXT X
;============
; 20
nexty: ; NEXT Y
pla
; lda YPOS ; y+=6
adc #5 ; carry always set coming in, so only add 5
; sta YPOS
pha
pla ; YPOS on stack
adc #5 ; y+=6
; carry always set coming in, so only add 5
pha ; YPOS back on stack
cmp #189 ; see if less than 189
bcc yloop ; if so, loop