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Some additional comments in CMS

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This commit is contained in:
Jasmine Iwanek
2024-08-19 02:40:14 -04:00
parent c4f88dce13
commit c0e73d777a
1 changed files with 12 additions and 11 deletions
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23
src/sound/snd_cms.c
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@@ -95,15 +95,15 @@ cms_write(uint16_t addr, uint8_t val, void *priv)
int chip = (addr & 2) >> 1; int chip = (addr & 2) >> 1;
switch (addr & 0xf) { switch (addr & 0xf) {
case 1: case 0x1: /* SAA #1 Register Select Port */
cms->addrs[0] = val & 31; cms->addrs[0] = val & 31;
break; break;
case 3: case 0x3: /* SAA #2 Register Select Port */
cms->addrs[1] = val & 31; cms->addrs[1] = val & 31;
break; break;
case 0: case 0x0: /* SAA #1 Data Port */
case 2: case 0x2: /* SAA #2 Data Port */
cms_update(cms); cms_update(cms);
cms->regs[chip][cms->addrs[chip] & 31] = val; cms->regs[chip][cms->addrs[chip] & 31] = val;
switch (cms->addrs[chip] & 31) { switch (cms->addrs[chip] & 31) {
@@ -145,8 +145,9 @@ cms_write(uint16_t addr, uint8_t val, void *priv)
break; break;
} }
break; break;
case 0x6:
case 0x7: case 0x6: /* GameBlaster Write Port */
case 0x7: /* GameBlaster Write Port */
cms->latched_data = val; cms->latched_data = val;
break; break;
@@ -161,14 +162,14 @@ cms_read(uint16_t addr, void *priv)
const cms_t *cms = (cms_t *) priv; const cms_t *cms = (cms_t *) priv;
switch (addr & 0xf) { switch (addr & 0xf) {
case 0x1: case 0x1: /* SAA #1 Register Select Port */
return cms->addrs[0]; return cms->addrs[0];
case 0x3: case 0x3: /* SAA #2 Register Select Port */
return cms->addrs[1]; return cms->addrs[1];
case 0x4: case 0x4: /* GameBlaster Read port (Always returns 0x7F) */
return 0x7f; return 0x7f;
case 0xa: case 0xa: /* GameBlaster Read Port */
case 0xb: case 0xb: /* GameBlaster Read Port */
return cms->latched_data; return cms->latched_data;
default: default: