otomatalabs/furnace
8
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

AY8930: Fix tone and noise period in expanded mode.

Browse source 
By doubling the internal clock frequency.

In expanded mode, the same tone period is an octave higher than in compat mode.
In expanded mode, the noise period is twice as fast as currently implemented.

See https://github.com/tildearrow/furnace/pull/416
This commit is contained in:
Laurens Holst 2022-05-03 19:32:17 +02:00
parent ffa0727bf6
commit 49ff39abee
2 changed files with 6 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/engine/platform/ay8930.cpp
View file

@ -27,7 +27,7 @@
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite2(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 8
#define CHIP_DIVIDER 4
const char* regCheatSheetAY8930[]={
"FreqL_A", "00",
@ -645,7 +645,7 @@ void DivPlatformAY8930::setFlags(unsigned int flags) {
chipClock=COLOR_NTSC/2.0;
break;
}
rate=chipClock/8;
rate=chipClock/4;
for (int i=0; i<3; i++) {
oscBuf[i]->rate=rate;
}