Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!sol.ctr.columbia.edu!emory!gatech!ncsuvx!news From: kdarling@hobbes.ncsu.edu (Kevin Darling) Newsgroups: comp.sys.m6809 Subject: Re: 6309 Message-ID: <1990Dec12.071103.7358@ncsuvx.ncsu.edu> Date: 12 Dec 90 07:11:03 GMT References: <00940D61.63CAC900@rigel.efd.lth.se> Sender: news@ncsuvx.ncsu.edu (USENET News System) Organization: NCSU Computing Center Lines: 34 (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 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