X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fnotes.txt;h=04b808aea773b3ec4e8cf0aefca073a5c2babfb3;hb=bb29b68685bde915f16113f5400dbbdb7be6c097;hp=4829af23d829ee01ac8286be61681deea978a27a;hpb=27ad8041c00ff80e50ba0ad9022c3eaa7a05b8b0;p=thunder diff --git a/doc/notes.txt b/doc/notes.txt index 4829af2..04b808a 100755 --- a/doc/notes.txt +++ b/doc/notes.txt @@ -28,7 +28,7 @@ Char matrix is 36x28 (Text mode) -> CMOS seems to be mapped to $5400 in RAM1... - TOP 5 + TOP 5 SCORE AREA INI'T 1ST 30000 5 ALB 2ND 20000 4 LIR @@ -57,7 +57,7 @@ $D803 is bank switch for CPU #2 (4 8K banks) $6000, 6200, 6400, 6600 are voice. 6200 & 6600 are sample # to play, 6000 & 6400 are the strobe lines. -PSG: +PSG: CPU #1's stack is mapped to $5FFF, #2 to $43FF @@ -86,3 +86,41 @@ DIPSWITCH SETTINGS: 10 undefined 11 Type C(cocktail, flip) 2-8: Continuation-off 6 games max, on 3 games max + + +Date: Thu, 30 Jul 1998 18:45:51 -0500 +From: Lee Saito +To: Jimmy Hamm +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! ;)