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Some frequency tweaks.

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konamigx: set screen refresh rate to 58Hz (parameters from developer manual are not 100% correct)
Removed sound CPU clock hack. tbyahhoo doesn't require 9.2MHz to boot.

tecmosys: set screen refresh rate to 57.4458Hz according to Guru's measurements. Credit Guru for this.
This commit is contained in:
Yasuhiro Ogawa 2008-06-17 09:20:50 +00:00
parent 8628f1dafe
commit bc743298b7
2 changed files with 10 additions and 7 deletions
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15
src/mame/drivers/konamigx.c
View File

@ -1314,10 +1314,7 @@ static MACHINE_DRIVER_START( konamigx )
MDRV_CPU_PROGRAM_MAP(gx_base_memmap, gx_type2_map)
MDRV_CPU_VBLANK_INT("main", konamigx_vbinterrupt)
/* note: part is a -8, crystals are 18.4 and 32.0 MHz, and
twinbee yahhoo will not pass POST if the 68000 isn't
running at least this fast. so the higher speed is probably a HACK... */
MDRV_CPU_ADD_TAG("sound", M68000, 9200000)
MDRV_CPU_ADD_TAG("sound", M68000, 8000000)
/* audio CPU */
MDRV_CPU_PROGRAM_MAP(gxsndmap, 0)
MDRV_CPU_PERIODIC_INT(irq2_line_hold, 480)
@ -1332,8 +1329,14 @@ static MACHINE_DRIVER_START( konamigx )
MDRV_VIDEO_ATTRIBUTES(VIDEO_HAS_SHADOWS | VIDEO_HAS_HIGHLIGHTS | VIDEO_UPDATE_AFTER_VBLANK)
MDRV_SCREEN_ADD("main", RASTER)
MDRV_SCREEN_RAW_PARAMS(6000000, 288+17+32+49, 0, 287, 224+17+8+16, 0, 223)
MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(600))
// MDRV_SCREEN_RAW_PARAMS(6000000, 288+17+32+49, 0, 287, 224+17+8+16, 0, 223)
/* These parameters should be correct according to developer manual,
but sound and graphics of tbyahhoo's attract mode doesn't sync correctly.
(better than previous 60Hz, though) Setting refresh rate to 58Hz fixes this.
We have to check actual value written to the CCU. */
MDRV_SCREEN_REFRESH_RATE(58)
// MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(600))
MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
MDRV_SCREEN_SIZE(64*8, 32*8)
MDRV_SCREEN_VISIBLE_AREA(24, 24+288-1, 16, 16+224-1)

2
src/mame/drivers/tecmosys.c
View File

@ -936,7 +936,7 @@ static MACHINE_DRIVER_START( deroon )
MDRV_VIDEO_ATTRIBUTES(VIDEO_UPDATE_AFTER_VBLANK)
MDRV_SCREEN_ADD("main", RASTER)
MDRV_SCREEN_REFRESH_RATE(60)
MDRV_SCREEN_REFRESH_RATE(57.4458)
MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(3000))
MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
MDRV_SCREEN_SIZE(64*8, 64*8)