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entropy: add first working version

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This commit is contained in:
Vince Weaver 2018-05-28 00:02:37 -04:00
parent 1b2fd71fc6
commit 07202ab93c
2 changed files with 102 additions and 18 deletions
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35
asoft_basic-utils/float_convert.c Normal file
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@ -0,0 +1,35 @@
#include <stdio.h>
int main(int argc, char **argv) {
// long long values[5]={0x84,0x80,0,0,0}; // 8
// long long values[5]={0x80,0xcc,0xcc,0xcc,0xcc}; // .8
long long values[5]={0x7c,0xf7,0x95,0x54,0xfa}; // .8
long long exponent,mantissa,sign;
long long integer;
double fp=0;
exponent=values[0]-0x80;
sign=1;
// below only true if packed */
// sign=(values[1]&0x80)?-1:1;
mantissa=((values[1]|0x80)<<24)|
(values[2]<<16)|
(values[3]<<8)|
(values[4]);
integer=mantissa>>(32-exponent);
if (mantissa==0) {
printf("DIV BY ZERO\n");
return 0;
}
fp=(double)mantissa/(double)(1ULL<<32);
printf("Sign=%lld Mantissa=%llx Exponent=%llx\n",sign,mantissa,exponent);
printf("Integer=%lld fp=%lf\n",integer,fp);
return 0;
}

85
two-liners/entropy.s
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@ -13,6 +13,17 @@
; SCALE=(RND(1)<E)*RND(1)*E*20+1: XDRAW 1 AT X,Y:
; NEXT: NEXT: NEXT
; Optimization
; 144 bytes: first working version (including DOS33 4-byte size/addr)
;BLT=BCC, BGE=BCS
; zero page locations
@ -46,6 +57,10 @@ YPOS = $FF
SNGFLT = $E301
CONINT = $E6FB
FMULT = $E97F
MUL10 = $EA39
DIV10 = $EA55
MOVAF = $EB63
FLOAT = $EB93
RND = $EFAE
HGR2 = $F3D8
HPOSN = $F411
@ -66,9 +81,18 @@ eloop: ; FOR E=.08 TO .15 STEP .01:
; 0 1 2 3 4 5 6
; EINT 8 9 10 11 12 13 14
; E*20 160 180 200 220 240 260 280
; E*16 $80 $90 $A0 $B0 $C0 $D0 $E0
; 128 144 160 176 192 208 224
; 1.6 1.8 2.0 2.2 2.4 2.6 2.8
; 1 1 2 2 2 2 2
; E*25 200 225 250 275 300 325 350
; 2 2 2 2 3 3 3
; E*16 128 144 160 176 192 218 234
; 8 is E*100
; E*100/5 = 20
; E*80/4 = 20
; 6.4 7.2 8.0 8.8 9.6 10.4 11.2
; E*160/8 = 20
; 12.8 14.4 16.0 17.6 19.2
lda #4
sta YPOS
@ -99,34 +123,59 @@ xloop: ; FOR X=4 to 278 STEP 6
; on the Apple II", Behavior Research Methods, Instruments,
; & Computers, 1987, 19 (4), 397-399.
; put random value in FAC
ldx #1 ; RND(1), Force 1
jsr RND+6 ; we skip passing the argument
; in FAC as that would be a pain
jsr RND ; put random value in FAC
; Compare to E
ldy #>TEN
lda #<TEN
jsr FMULT
ldy #>TEN
lda #<TEN
jsr FMULT
; ldy #>TEN
; lda #<TEN
jsr MUL10
jsr MUL10
jsr CONINT
debug:
; X is now RND(1)*100
cpx EPOS
bcs more
less:
lda #1
jmp done
bcc less ; branch if less than EPOS
more:
lda #2
lda #1 ; the boring case
jmp done
less:
; SCALE=RND(1)*E*20+1
; EPOS is E*100, so RND(1)*(EPOS/10)*2+1
; is EPOS/4 close enough?
; put random value in FAC
ldx #1 ; RND(1), Force 1
jsr RND+6 ; we skip passing the argument
; in FAC as that would be a pain
lda EPOS
jsr FLOAT ; convert value in A to float in FAC
; jsr MOVAF ; mov FAC into ARG
jsr DIV10 ; FAC=FAC/10
ldy #>RND_EXP
lda #<RND_EXP
jsr FMULT ; multiply FAC by (Y,A)
inc FAC_EXP ; multiply by 2
jsr CONINT ; convert to int (in X)
inx
txa ; move to A
; lsr
; clc
; adc #1
done:
sta HGR_SCALE
ldy XPOSH
ldx XPOS
lda YPOS