80486DX2-66/86Box-fork
1
0
Fork 0
Code Issues Pull Requests Activity

Add the lo-tech EMS Board

Browse Source
This commit is contained in:
Jasmine Iwanek
2024-05-31 00:38:07 -04:00
parent c50d0c3208
commit 3f0e5ccf27
1 changed files with 146 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

149
src/device/isamem.c
View File

@@ -33,8 +33,10 @@
*
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Jasmine Iwanek <jriwanek@gmail.com>
*
* Copyright 2018 Fred N. van Kempen.
* Copyright 2018 Fred N. van Kempen.
* Copyright 2022-2024 Jasmine Iwanek.
*
* Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the
@@ -98,6 +100,7 @@
#define ISAMEM_ABOVEBOARD_CARD 12
#define ISAMEM_BRAT_CARD 13
#define ISAMEM_EV165A_CARD 14
#define ISAMEM_LOTECH_CARD 15
#define ISAMEM_DEBUG 0
@@ -318,6 +321,26 @@ ems_read(uint16_t port, void *priv)
return ret;
}
/* Handle a READ operation from one of our registers. */
static uint8_t
consecutive_ems_read(uint16_t port, void *priv)
{
const memdev_t *dev = (memdev_t *) priv;
uint8_t ret = 0xff;
int vpage;
/* Get the viewport page number. */
vpage = (port - dev->base_addr);
isamem_log("ISAMEM: read(%04x) = %02x) page=%d\n", port, ret, vpage);
ret = dev->ems[vpage].page;
if (dev->ems[vpage].enabled)
ret |= 0x80;
return ret;
}
/* Handle a WRITE operation to one of our registers. */
static void
ems_write(uint16_t port, uint8_t val, void *priv)
@@ -393,6 +416,47 @@ ems_write(uint16_t port, uint8_t val, void *priv)
}
}
/* Handle a WRITE operation to one of our registers. */
static void
consecutive_ems_write(uint16_t port, uint8_t val, void *priv)
{
memdev_t *dev = (memdev_t *) priv;
int vpage;
/* Get the viewport page number. */
vpage = (port - dev->base_addr);
isamem_log("ISAMEM: write(%04x, %02x) page=%d\n", port, val, vpage);
isamem_log("EMS: write(%02x) to register 0! (%02x)\n", val);
/* Set the page number. */
dev->ems[vpage].enabled = (val & 0xff);
dev->ems[vpage].page = (val & 0xff);
/* 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 & 0xff) * 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);
/* Enable this page. */
mem_mapping_enable(&dev->ems[vpage].mapping);
} else {
/* Disable this page. */
mem_mapping_disable(&dev->ems[vpage].mapping);
}
}
}
/* Initialize the device for use. */
static void *
isamem_init(const device_t *info)
@@ -476,6 +540,13 @@ isamem_init(const device_t *info)
dev->flags |= FLAG_FAST;
break;
case ISAMEM_LOTECH_CARD:
dev->base_addr = device_get_config_hex16("base");
dev->total_size = device_get_config_int("size");
dev->start_addr = 0;
dev->frame_addr = device_get_config_hex20("frame");
dev->flags |= (FLAG_EMS | FLAG_CONFIG);
default:
break;
}
@@ -663,9 +734,14 @@ isamem_init(const device_t *info)
mem_mapping_disable(&dev->ems[i].mapping);
/* Set up an I/O port handler. */
io_sethandler(dev->base_addr + (EMS_PGSIZE * i), 2,
ems_read, NULL, NULL, ems_write, NULL, NULL, dev);
if (dev->board != ISAMEM_LOTECH_CARD)
io_sethandler(dev->base_addr + (EMS_PGSIZE * i), 2,
ems_read, NULL, NULL, ems_write, NULL, NULL, dev);
}
if (dev->board == ISAMEM_LOTECH_CARD)
io_sethandler(dev->base_addr, 4,
consecutive_ems_read, NULL, NULL, consecutive_ems_write, NULL, NULL, dev);
}
/* Let them know our device instance. */
@@ -1439,6 +1515,72 @@ static const device_t brat_device = {
};
#endif
static const device_config_t lotech_config[] = {
// clang-format off
{
.name = "base",
.description = "Address",
.type = CONFIG_HEX16,
.default_string = "",
.default_int = 0x0260,
.file_filter = "",
.spinner = { 0 },
.selection = {
{ .description = "260H", .value = 0x0260 },
{ .description = "264H", .value = 0x0264 },
{ .description = "268H", .value = 0x0268 },
{ .description = "26CH", .value = 0x026C },
{ .description = "" }
},
},
{
.name = "frame",
.description = "Frame Address",
.type = CONFIG_HEX20,
.default_string = "",
.default_int = 0xe0000,
.file_filter = "",
.spinner = { 0 },
.selection = {
{ .description = "Disabled", .value = 0x00000 },
{ .description = "C000H", .value = 0xC0000 },
{ .description = "D000H", .value = 0xD0000 },
{ .description = "E000H", .value = 0xE0000 },
{ .description = "" }
},
},
{
.name = "size",
.description = "Memory Size",
.type = CONFIG_SPINNER,
.default_string = "",
.default_int = 2048,
.file_filter = "",
.spinner = {
.min = 512,
.max = 4096,
.step = 512
},
.selection = { { 0 } }
},
{ .name = "", .description = "", .type = CONFIG_END }
// clang-format on
};
static const device_t lotech_device = {
.name = "Lo-tech EMS Board",
.internal_name = "lotechems",
.flags = DEVICE_ISA,
.local = ISAMEM_LOTECH_CARD,
.init = isamem_init,
.close = isamem_close,
.reset = NULL,
{ .available = NULL },
.speed_changed = NULL,
.force_redraw = NULL,
.config = lotech_config
};
#if defined(DEV_BRANCH) && defined(USE_ISAMEM_RAMPAGE)
static const device_config_t rampage_config[] = {
// clang-format off
@@ -1676,6 +1818,7 @@ static const struct {
#if defined(DEV_BRANCH) && defined(USE_ISAMEM_IAB)
{ &iab_device },
#endif
{ &lotech_device },
{ NULL }
// clang-format on
};