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hgr: actual hgr now works. N flag on CMP is a but unexpected

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This commit is contained in:
Vince Weaver 2018-07-02 11:20:30 -04:00
parent 81be689dbe
commit 261dbbbe81
1 changed files with 9 additions and 4 deletions
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13
gr-sim/hgr-sim.c
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@ -5,9 +5,12 @@
#include "6502_emulate.h"
static void color_shift(void) {
// F47E
a=a<<1;
if (a>=0xc0) goto done_color_shift;
asl();
cmp(0xc0);
if (!n) goto done_color_shift;
a=ram[HGR_BITS];
a=a^0x7f;
@ -120,7 +123,10 @@ static void hposn(void) {
// F438
a=x;
if (y==0) {
c=0;
goto hposn_2;
} else {
c=1;
}
y=35;
adc(4);
@ -136,8 +142,7 @@ hposn_2:
// MSKTBL=F5B8
ram[HMASK]=a;
a=y;
c=a&1;
a=a>>1;
lsr();
a=ram[HGR_COLOR];
ram[HGR_BITS]=a;
if (c) color_shift();