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more clarification; no whatsnew.

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This commit is contained in:
Jonathan Gevaryahu 2011-05-29 04:02:50 +00:00
parent b436a833eb
commit 6659e57a43
1 changed files with 8 additions and 5 deletions
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13
src/mame/drivers/segae.c
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@ -11,7 +11,10 @@
An interesting feature of the system is that the CPU is contained on the ROM
board, the MAIN System E board contains the Graphics processor, this opens the
possibility for using processors other than the Standard Z80 to run the main
game code on; several games have an encrypted Z80 module instead.
game code on; several games have an encrypted Z80 module instead. However, the
system as a whole is very Z80-centric; using a completely non-Z80 processor
would require the addition of glue logic to the rom board to make the cpu
'look' like a Z80 to the rest of the system.
Also interesting is each VDP has double the Video RAM found on the SMS console
this is banked through Port Writes, the System also allows for the Video RAM
@ -106,9 +109,9 @@ PCB Layout
| LA4460 |----------------------------------| |
|-----------------------------------------------------|
Notes:
XTAL1 - 10.738535Mhz
315-5124 VDP clock - 10.738535MHz
SN76496 clock - 3.579545MHz [10.7386/3]
XTAL1 - 10.7386Mhz
315-5124 VDP clock - 10.7386MHz
SN76496 clock - 3.579533MHz [10.7386/3]
D4168 - 8k x8 SRAM
VSync - 60Hz
HSync - 15.58kHz
@ -868,7 +871,7 @@ static ADDRESS_MAP_START( io_map, AS_IO, 8 )
ADDRESS_MAP_END
static MACHINE_CONFIG_START( systeme, driver_device )
MCFG_CPU_ADD("maincpu", Z80, XTAL_10_738635MHz/2) /* Z80B @ 5.3693175Mhz */
MCFG_CPU_ADD("maincpu", Z80, XTAL_10_738635MHz/2) /* Z80B @ 5.3693Mhz */
MCFG_CPU_PROGRAM_MAP(systeme_map)
MCFG_CPU_IO_MAP(io_map)