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- From: peirce@outpost.SF-Bay.org (Michael Peirce)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Speeding up the IIvx
- Message-ID: <D2150035.hu27b0@outpost.SF-Bay.org>
- Date: 6 Nov 92 01:22:52 GMT
- Reply-To: peirce@outpost.SF-Bay.org (Michael Peirce)
- Organization: Peirce Software
- Lines: 24
- X-Mailer: uAccess - Macintosh Release: 1.6v1
-
-
- In article <1992Nov4.171205.168@news.acns.nwu.edu> (comp.sys.mac.hardware), birdman@casbah.acns.nwu.edu (Christopher Kush) writes:
- >
- > But, fuck Apple, I buy my VX and put 70ns SIMMs in the slots, and (this is the
- > tricky part) force the machine to *ignore* the first 4MB (or, better yet,
- > access them LAST, after the SIMMs have filled up).
- >
- > Hell of a cheap way to dispense with all those wait states.
- >
- > Is there a way to do this?
-
- You could put in 10 ns DRAMs and it still wouldn't make one bit of
- difference. The speed printed on a DRAM is it's maximum rated speed
- not necessarily the speed it will be running at. The circuitry that
- a DRAM is plugged into determines the speed that it actually runs
- at. You Mac IIvx clocks it DRAM to run at 100 ns.
-
- 70 ns DRAM will be happy run at 100 ns. In fact, they're run cooler
- and maybe last longer than if you run them at 70 ns.
-
- -- Michael Peirce -- peirce@outpost.SF-Bay.org
- -- Peirce Software -- Suite 301, 719 Hibiscus Place
- -- -- San Jose, California USA 95117
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