Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

SB 2.0 mirrors the OPL2 at ports 2x0/2x1 when CMS/Gameblaster chips are not present. Fixes music in Syndicate.

Browse source
This commit is contained in:
SarahW 2018-04-18 16:05:01 +01:00
commit 51db026b90
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/sound_sb.c
View file

@ -1013,6 +1013,12 @@ void *sb_2_init()
"CD version" also uses 250h or 260h for
2x0 to 2x3 -> CDROM interface
2x4 to 2x5 -> Mixer interface*/
/*My SB 2.0 mirrors the OPL2 at ports 2x0/2x1. Presumably this mirror is
disabled when the CMS chips are present.
This mirror may also exist on SB 1.5 & MCV, however I am unable to
test this. It shouldn't exist on SB 1.0 as the CMS chips are always
present there.
Syndicate requires this mirror for music to play.*/
sb_t *sb = malloc(sizeof(sb_t));
uint16_t addr = device_get_config_int("addr");
memset(sb, 0, sizeof(sb_t));
@ -1025,6 +1031,8 @@ void *sb_2_init()
sb_ct1335_mixer_reset(sb);
/* CMS I/O handler is activated on the dedicated sound_cms module
DSP I/O handler is activated in sb_dsp_setaddr */
if (!GAMEBLASTER)
io_sethandler(addr, 0x0002, opl2_read, NULL, NULL, opl2_write, NULL, NULL, &sb->opl);
io_sethandler(addr+8, 0x0002, opl2_read, NULL, NULL, opl2_write, NULL, NULL, &sb->opl);
io_sethandler(0x0388, 0x0002, opl2_read, NULL, NULL, opl2_write, NULL, NULL, &sb->opl);