+
+
+Date: Thu, 30 Jul 1998 18:45:51 -0500
+From: Lee Saito <ksaito@concentric.net>
+To: Jimmy Hamm <jlhamm@pacificnet.net>
+Subject: Re: Rolling Thunder clock freqs
+
+Jimmy Hamm wrote:
+
+> >> I need to know the clock frequency and IRQ frequency of both processors,
+> so
+> >> if you could look at the E and Q lines (pins 34 and 35 of the 6809s) and
+> the
+> >> IRQ lines (pin 3 of the 6809s) that would be great!
+> >
+
+OK. I'm looking at the signals now...
+
+First, processor at 11A:
+
+pin 3 (IRQ line): Pulses vary in duration, making it somewhat difficult to
+determine frequency, but it's about 60 Hz (around 16 -17ms per pulse, 60Hz
+would be 16.6ms, I think) This seems to be tied to the sound processor?
+(pulses get real short when no sounds are playing)
+
+pin 35: approx 650 ns/cycle = 1.538 MHz
+
+pin 34: same as 35 (1.538 Mhz)
+
+Processor at 9A:
+
+Pin 3: Same as 11A (looks like 60Hz to me)
+
+Pin 35: Same as other processor (1.538 MHz)
+
+pin 34: Same as other processor (1.538 MHz)
+
+Hope this helps! ;)
+
+
+ROM_START( rthunder )
+ ROM_REGION( 0x18000, REGION_CPU1, 0 )
+ ROM_LOAD( "rt3-1b.9c", 0x8000, 0x8000) /* 9d empty */
+
+ ROM_REGION( 0x40000, REGION_USER1, 0 ) /* bank switched data for CPU1 */
+ ROM_LOAD( "rt1-17.f1", 0x00000, 0x10000)
+ ROM_LOAD( "rt1-18.h1", 0x10000, 0x10000)
+ ROM_LOAD( "rt1-19.k1", 0x20000, 0x10000)
+ ROM_LOAD( "rt1-20.m1", 0x30000, 0x10000)
+
+ ROM_REGION( 0x18000, REGION_CPU2, 0 )
+ ROM_LOAD( "rt3-2b.12c", 0x08000, 0x8000)
+ ROM_LOAD( "rt3-3.12d", 0x10000, 0x8000)
+
+ ROM_REGION( 0x18000, REGION_GFX1, ROMREGION_DISPOSE )
+ ROM_LOAD( "rt1-7.7r", 0x00000, 0x10000) /* plane 1,2 */
+ ROM_LOAD( "rt1-8.7s", 0x10000, 0x08000) /* plane 3 */
+
+ ROM_REGION( 0x0c000, REGION_GFX2, ROMREGION_DISPOSE )
+ ROM_LOAD( "rt1-5.4r", 0x00000, 0x08000) /* plane 1,2 */
+ ROM_LOAD( "rt1-6.4s", 0x08000, 0x04000) /* plane 3 */
+
+ ROM_REGION( 0x80000, REGION_GFX3, ROMREGION_DISPOSE )
+ ROM_LOAD( "rt1-9.12h", 0x00000, 0x10000)
+ ROM_LOAD( "rt1-10.12k", 0x10000, 0x10000)
+ ROM_LOAD( "rt1-11.12l", 0x20000, 0x10000)
+ ROM_LOAD( "rt1-12.12m", 0x30000, 0x10000)
+ ROM_LOAD( "rt1-13.12p", 0x40000, 0x10000)
+ ROM_LOAD( "rt1-14.12r", 0x50000, 0x10000)
+ ROM_LOAD( "rt1-15.12t", 0x60000, 0x10000)
+ ROM_LOAD( "rt1-16.12u", 0x70000, 0x10000)
+
+ ROM_REGION( 0x1420, REGION_PROMS, 0 )
+ ROM_LOAD( "mb7124e.3r", 0x0000, 0x0200) /* red & green components */
+ ROM_LOAD( "mb7116e.3s", 0x0200, 0x0200) /* blue component */
+ ROM_LOAD( "mb7138h.4v", 0x0400, 0x0800) /* tiles colortable */
+ ROM_LOAD( "mb7138h.6v", 0x0c00, 0x0800) /* sprites colortable */
+ ROM_LOAD( "mb7112e.6u", 0x1400, 0x0020) /* tile address decoder (used at runtime) */
+
+ ROM_REGION( 0x10000, REGION_CPU3, 0 )
+ ROM_LOAD( "rt1-4.6b", 0x04000, 0x8000)
+ ROM_LOAD( "rt1-mcu.bin", 0x0f000, 0x1000)
+
+ ROM_REGION( 0x40000, REGION_SOUND1, 0 ) /* PCM samples for Hitachi CPU */
+ ROM_LOAD( "rt1-21.f3", 0x00000, 0x10000)
+ ROM_LOAD( "rt1-22.h3", 0x10000, 0x10000)
+ /* k3 empty */
+ /* m3 empty */
+ROM_END
+