claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ISA memory cards: Implement EMS frame address recalculation.

Browse Source
This commit is contained in:
OBattler
2024-06-03 03:37:47 +02:00
parent 8a8d5f0870
commit d6baa28992
1 changed files with 23 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
src/device/isamem.c
View File

@@ -363,27 +363,24 @@ ems_write(uint16_t port, uint8_t val, void *priv)
dev->ems[vpage].enabled = (val & 0x80);
dev->ems[vpage].page = (val & 0x7f);
/* Make sure we can do that.. */
if (dev->flags & FLAG_CONFIG) {
if (dev->ems[vpage].page < dev->ems_pages) {
/* Pre-calculate the page address in EMS RAM. */
dev->ems[vpage].addr = dev->ram + dev->ems_start + ((val & 0x7f) * EMS_PGSIZE);
} else {
/* That page does not exist. */
dev->ems[vpage].enabled = 0;
}
if (dev->ems[vpage].page < dev->ems_pages) {
/* Pre-calculate the page address in EMS RAM. */
dev->ems[vpage].addr = dev->ram + dev->ems_start + ((val & 0x7f) * EMS_PGSIZE);
} else {
/* That page does not exist. */
dev->ems[vpage].enabled = 0;
}
if (dev->ems[vpage].enabled) {
/* Update the EMS RAM address for this page. */
mem_mapping_set_exec(&dev->ems[vpage].mapping,
dev->ems[vpage].addr);
if (dev->ems[vpage].enabled) {
/* Update the EMS RAM address for this page. */
mem_mapping_set_exec(&dev->ems[vpage].mapping,
dev->ems[vpage].addr);
/* Enable this page. */
mem_mapping_enable(&dev->ems[vpage].mapping);
} else {
/* Disable this page. */
mem_mapping_disable(&dev->ems[vpage].mapping);
}
/* Enable this page. */
mem_mapping_enable(&dev->ems[vpage].mapping);
} else {
/* Disable this page. */
mem_mapping_disable(&dev->ems[vpage].mapping);
}
break;
@@ -408,8 +405,13 @@ ems_write(uint16_t port, uint8_t val, void *priv)
*/
isamem_log("EMS: write(%02x) to register 1 !\n");
dev->ems[vpage].frame = val;
if (val)
dev->flags |= FLAG_CONFIG;
dev->frame_addr = 0x000c4000 + ((((dev->ems[2].frame & 0x80) >> 5) ||
((dev->ems[1].frame & 0x80) >> 6) ||
((dev->ems[0].frame & 0x80) >> 7)) << 14);
mem_mapping_disable(&dev->ems[0].mapping);
mem_mapping_disable(&dev->ems[1].mapping);
mem_mapping_disable(&dev->ems[2].mapping);
mem_mapping_disable(&dev->ems[3].mapping);
break;
default: