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Improve lotech EMS

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This commit is contained in:
Jasmine Iwanek
2024-06-07 01:37:51 -04:00
parent b3e72559a7
commit 3258ed67f9
1 changed files with 10 additions and 4 deletions
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14
src/device/isamem.c
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@@ -109,7 +109,8 @@
#define RAM_UMAMEM (384 << 10) /* upper memory block */
#define RAM_EXTMEM (1024 << 10) /* start of high memory */
#define EMS_MAXSIZE (4096 << 10) /* max EMS memory size */
#define EMS_MAXSIZE (2048 << 10) /* max EMS memory size */
#define EMS_LOTECH_MAXSIZE (4096 << 10) /* max EMS memory size for lotech cards */
#define EMS_PGSIZE (16 << 10) /* one page is this big */
#define EMS_MAXPAGE 4 /* number of viewport pages */
@@ -143,6 +144,7 @@ typedef struct memdev_t {
uint8_t flags;
#define FLAG_CONFIG 0x01 /* card is configured */
#define FLAG_LOTECH 0x02 /* Lotech EMS supports upto 4MB with a hack */
#define FLAG_WIDE 0x10 /* card uses 16b mode */
#define FLAG_FAST 0x20 /* fast (<= 120ns) chips */
#define FLAG_EMS 0x40 /* card has EMS mode enabled */
@@ -565,8 +567,9 @@ isamem_init(const device_t *info)
dev->flags |= FLAG_FAST;
break;
case ISAMEM_BRXT_CARD: /* BocaRAM/XT */
case ISAMEM_LOTECH_CARD:
case ISAMEM_LOTECH_CARD: /* Lotech EMS */
dev->flags |= FLAG_LOTECH;
case ISAMEM_BRXT_CARD: /* BocaRAM/XT */
dev->base_addr[0] = device_get_config_hex16("base");
dev->total_size = device_get_config_int("size");
dev->start_addr = 0;
@@ -724,7 +727,10 @@ isamem_init(const device_t *info)
if (dev->flags & FLAG_EMS) {
/* EMS 3.2 cannot have more than 4096KB per board. */
t = k;
if (t > EMS_MAXSIZE)
if ((dev->flags & FLAG_LOTECH) && (t > EMS_LOTECH_MAXSIZE))
/* Lotech EMS cannot have more than 4096KB per board. */
t = EMS_LOTECH_MAXSIZE;
else if (t > EMS_MAXSIZE)
t = EMS_MAXSIZE;
/* Set up where EMS begins in local RAM, and how much we have. */