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Merge pull request #433 from kazblox/patch-2

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dpcplus - correct ARM speed, fix RAM, add ROM to map
This commit is contained in:
David Haywood 2015-10-28 15:26:50 +00:00
commit 687082f308
1 changed files with 21 additions and 4 deletions
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25
src/devices/bus/vcs/dpcplus.c
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@ -4,7 +4,23 @@
Atari 2600 cart with DPC+
the DPC+ adds an ARM CPU amongst other things
the DPC+ adds an ARM CPU amongst other things (display improvements, etc.)
map (according to a blogpost on atariage):
NOTE: All banks are accessible via $F000
* ARM RAM mapped at $40000000 in this area
$0000-$0BFF: DPC+ driver (not accessible by 2600 itself)
$0C00-$1BFF: Bank 0
$1C00-$2BFF: Bank 1
$2C00-$3BFF: Bank 2
$3C00-$4BFF: Bank 3
$4C00-$5BFF: Bank 4
$5C00-$6BFF: Bank 5
* ARM RAM mapped at $40000C00 in this area
$6C00-$7BFF: Display Data (indirect access)
* ARM RAM mapped at $40001C00 in this area
$7C00-$7FFF: Frequency Data (not accessible by 2600 itself)
***************************************************************************/
@ -41,12 +57,13 @@ void a26_rom_dpcplus_device::device_reset()
}
static ADDRESS_MAP_START( dpcplus_arm7_map, AS_PROGRAM, 32, a26_rom_dpcplus_device )
AM_RANGE(0x00000000, 0x00003fff) AM_RAM
// todo: implement all this correctly
//AM_RANGE(0x00000000, 0x00007fff) AM_ROM // flash, 32k
AM_RANGE(0x40000000, 0x40001fff) AM_RAM // sram, 8k
ADDRESS_MAP_END
static MACHINE_CONFIG_FRAGMENT( a26_dpcplus )
MCFG_CPU_ADD("arm", ARM7, 20000000) // ? type ? speed
MCFG_CPU_ADD("arm", ARM7, 70000000) // correct type?
MCFG_CPU_PROGRAM_MAP(dpcplus_arm7_map)
MACHINE_CONFIG_END