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- Newsgroups: comp.sys.m68k
- Path: sparky!uunet!munnari.oz.au!newsroom.utas.edu.au!tasman.cc.utas.edu.au!steveh
- From: steveh@tasman.cc.utas.edu.au (Steve Howell)
- Subject: A few Questions on the 68000 and 68008...
- Message-ID: <steveh.726716248@tasman>
- Sender: news@newsroom.utas.edu.au
- Organization: University of Tasmania, Australia.
- Date: Mon, 11 Jan 1993 01:37:28 GMT
- Lines: 28
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- ok.. its been somewhat confirmed that a 6809 is not avail in a SMD package, so
- i guess the time has come to go 68k at long last.
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- just a few questions before i dive in...
- can i do the following with a mc68008?
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- 1) can i use the upper address lines thru say a 74ls138 (3-to-8) decoder
- to create the enable signal for each pheripherial?.. or do i need some
- complex PAL or something (like everone elses uses that ive seen!)
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- 2) the E timming signal on the 68000. is it on the 68008?
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- 3) what is the base adress for RAM ($0000 is what a 6809 is at, but i hear its
- not this simple with 68k devices?.. is this right?)
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- 4) Can i put ROM anywhere i like in the address map? (as long as its big enough)
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- Thanks
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- Steve H
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