newsuser@efd.lth.se (News server connection) (12/08/90)
When I opened up my Yamaha TX16W sampler I found out that the CPU in it was a
6309. Somebody told me that this was the Hitachi copy of the 6809.
Is this true?
I also wonder how this processor can handle the fast data transfer that a
sampler of this kind must do. It can sample at a frequency of 55kHz!
Anybody?
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\_________________________________________________________________/pete@wlbr.imsd.contel.com (Pete Lyall) (12/08/90)
Even if sampling at 55Mhz, that's a period time of around 18usec.
That's a yawner for even most 8 bit machines. The 6309 was also a
faster version of the 6809 (3MHZ vice the 68B09 @ 2MHZ or 6809 @
1MHZ), and it was CMOS as well, if I recall correctly.
Pete Lyall
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Internet: pete@wlbr.imsd.contel.com UUCP: {hacgate,jplgodo,voder}!wlbr!pete cxw3455@isc.rit.edu (C.X. Woodward ) (12/09/90)
Just a curiosity. Is the 6309 pin for pin compatable with the 68b09? If so where can I get one, if not would it be easy/hard to "modify" one to work like one. I know turning up the clock speed will ruin the display, but I can correct that. Thanks. -- !------------------------------------------------------------- ! That's right, you guessed it, I represent the EASTER BUNNY. ! Any complaints should be directed to 1-800-5477-277. ! (I don't represent anybody's views, especially not mine! :-)
kdarling@hobbes.ncsu.edu (Kevin Darling) (12/12/90)
(previous posting appears lost) > Somebody told me that this was the Hitachi copy of the 6809. Is this true? Yes, it's the Hitachi CMOS version of the 6809. I run a 63C09E in my CoCo-3 to cut down on my power consumption (since I also still have the *original* CoCo-3 1-meg board installed, which has no external power supply). > I also wonder how this processor can handle the fast data transfer that a > sampler of this kind must do. It can sample at a frequency of 55kHz! The 6309 is rated at up to 3Mhz... tho we ran one at 5Mhz for a short while just for fun ;-). See if you can find the cpu crystal nearby... might give us a clue as to the speed your cpu is being run at. Neat 6309 story #1 - Supposedly, because the Motorola version only goes to 2Mhz, Hitachi is not allowed to advertise theirs as twice (or more) as fast. Neat 6309 story #2 - Hitachi at first wanted to cut one cycle out of all instruction times, but Motorola wouldn't let them do this for compatability reasons. Neat 6309 story #3 - Normally reliable sources have claimed to have seen -15- Mhz versions. I vouch for none of the above stories, btw... altho #1 and #2 are almost certainly true. best - kevin <kdarling@catt.ncsu.edu> PS: the 6809/6309 are plug compatible. Software-wise also, with the minor exception that the 6309 handles invalid opcodes differently, which threw me one day when i had a bug (bad jump into code)... the bug fell threw ok on my 6309, didn't on a 6809. Detail: the 6309 skips the bad byte and continues at the next byte. The 6809 dumps the prefetched next byte (they both have a one-byte prefetch) and continues. - kev
kdarling@hobbes.ncsu.edu (Kevin Darling) (12/15/90)
Because I've gotten a bunch of mail inquiries about using a Hitachi 63C09E (3 Mhz version of the 6809E) I thought I'd better post this in general: Putting in a higher speed-rated chip will _not_ speed up your CoCo. At most, this chip will draw less power, and run much cooler. But the CoCo is designed to run at certain speeds (the max of which is 2Mhz), and cannot be speeded up because of timing requirements for shared video memory access, etc. (Umm, it _is_ possible to design a circuit to speed up the cpu during internal-only calculations.... Bob Puppo did such a circuit, but it's rather complicated for the only about 20% speed increase you can get). But no, just dropping in a 3Mhz rated cpu won't speed you up, any more than putting in 50ns DRAMs would. This is very akin to putting "200mph" tires on a 100mph top speed car... you have more safety margin, but they WON'T make the car go faster. You only got more expensive tires, is all ;-). The 6309 we ran at 3-5Mhz was obviously not in a CoCo... but in a simple controller board without any video, etc. - kevin <kdarling@catt.ncsu.edu>
halkoD@batman.moravian.EDU (David Halko) (01/08/91)
In article <1990Dec8.190654.9640@isc.rit.edu>, cxw3455@isc.rit.edu (C.X. Woodward ) writes: > > Just a curiosity. Is the 6309 pin for pin compatable with the 68b09? > If so where can I get one, if not would it be easy/hard to "modify" one > to work like one. I know turning up the clock speed will ruin the > display, but I can correct that. Thanks. > -- > !------------------------------------------------------------- > ! That's right, you guessed it, I represent the EASTER BUNNY. > ! Any complaints should be directed to 1-800-5477-277. > ! (I don't represent anybody's views, especially not mine! :-) How can you correct that???? David J. Halko
zambotti@wpowz.enet.dec.com (Walter Zambotti) (01/24/91)
Hi there, this is like the second time I've ever used a news reader and I'm stuck. can you direct me to how I can use the news reader. If you like answer this : 1 ) why do different servers present different groups. 2) when I first invoke my news reader it displays a huge list of groups to chose from. After subscribing a couple of these groups (whatever that means) I somehow manage to select an option to isolate those groups and read thru them. Where has the original big group list gone? And how do I get back to it? 3) In any one group that I browse through it is mentioned that there are thousands of articles but when I select that group I can only get to a hand full of them. Why? Where are the other articles and how do I access them? 4) What is the correct proceedure for gaining on line help? regards, Confused, Walter