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Initialise A20 gate correctly at startup.

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Keyboard controller self-test command enables A20.
HIMEM.SYS included with Windows/286 now works.
This commit is contained in:
TomW 2015-10-12 13:42:09 +01:00
commit 9d2dd22d6d
2 changed files with 15 additions and 4 deletions
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8
src/mem.c
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@ -1736,6 +1736,9 @@ void mem_add_bios()
mem_mapping_add(&bios_high_mapping[7], 0xffffc000, 0x04000, mem_read_bios, mem_read_biosw, mem_read_biosl, mem_write_null, mem_write_nullw, mem_write_nulll, rom + (0x1c000 & biosmask), 0, 0);
}
int mem_a20_key = 0, mem_a20_alt = 0;
static int mem_a20_state = 1;
void mem_init()
{
int c;
@ -1847,6 +1850,8 @@ void mem_resize()
mem_mapping_add(&romext_mapping, 0xc8000, 0x08000, mem_read_romext, mem_read_romextw, mem_read_romextl, NULL, NULL, NULL, romext, 0, NULL);
// pclog("Mem resize %i %i\n",mem_size,c);
mem_a20_key = 2;
mem_a20_recalc();
}
void mem_reset_page_blocks()
@ -1863,9 +1868,6 @@ void mem_reset_page_blocks()
}
}
int mem_a20_key = 0, mem_a20_alt = 0;
static int mem_a20_state = 0;
void mem_a20_recalc()
{
int state = mem_a20_key | mem_a20_alt;