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- From: Mike_Noreen%cave@sweden.eu.net (Mike Noreen)
- Newsgroups: comp.sys.amiga.misc
- Subject: Re: AA chipset in the A3000 -> I expect it!
- Distribution: world
- Message-ID: <Mike_Noreen.07pd%cave@sweden.eu.net>
- Date: 2 Sep 92 20:51:20 PST
- Organization: The Misty Cave BBS +46 753 33132
- Lines: 42
-
- In a message dated Wed 1 Sep 92 16:18, Mks@cbmvax.commodore.com (michael S
- wrote:
-
- > CA> It may make some kind of sense though. Under the new systems you
- > CA> have to enquire to find out whether there is 2x or 4x speedup.
- > CA> Adding
- > CA> the new chips to the A3000 would only gain 2x speedup due to the
- > CA> different type of RAM chips needed for the 4x speedup. I doubt C=
- > CA> would
- > CA> cripple their new machines by using memory that would only give a 2x
- > CA> speedup, so this may imply you can add the new chips to the 3000, but
- > CA> just not get full utilization.
- >
- >Hm? What you need to get 4x speedup is a 32-bit bus and page-mode DRAMs
- >chip-mem. The A3000 has both.
- >IF the AA-chipset ever becomes available for the A3000, it WILL be able to
- >use all the colours/resolutions available.
-
- MS> Well, guys, it does not. The Custom Chip accesses to CHIP RAM is 16-
- MS> bits.
- MS> The number of pins == 16-bits. The controller (AGNUS) does not
- MS> handle
- MS> more nor does it do page mode.
-
- MS> It is like buying a 4-cylinder car and wanting to upgrade to 8-
- MS> cylinders by
- MS> replacing the pistons. (For those that don't know: this does not
- MS> work)
-
- Well yes offcourse the Agnus -being a 16-bit chip- accesses the chip RAM
- through a 16-bit bus. Nobody thought you could simply replace Agnus with
- <whatever the new agnus might be called>.
- But since the CPU has 32-bit access to chip-ram, would it not be possible
- to put the AA-chips on a board in the CPU-slot? And let the old Agnus et al
- become redundant?
- I'm merely speculating, and you are offcourse in a much better position to
- know than I, but it could be done, couldn't it?
-
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