Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!whuxl!whuxlm!akgua!gatech!ut-sally!topaz!harvard!gcc-milo!timp From: timp@gcc-milo.UUCP Newsgroups: net.micro.mac Subject: Re: Re: Hyperdrive 2000 info from GCC Message-ID: <467@gcc-milo.ARPA> Date: Tue, 4-Feb-86 11:33:28 EST Article-I.D.: gcc-milo.467 Posted: Tue Feb 4 11:33:28 1986 Date-Received: Fri, 7-Feb-86 08:13:49 EST References: <412@sol1.UUCP> <290@ius2.cs.cmu.edu> <263@tolerant.UUCP> <139@calma.UUCP> Reply-To: timp@gcc-milo.UUCP (Tim Peacock) Organization: General Computer Company, Cambridge Ma Lines: 40 This message is in reply to the on going debate on HyperDrive 2000 in specific and the effect of higher clock speeds for the 68K on the Mac in general. There has been mention that some of the code in the ROM is timing sensitive. On HyperDrive 2000, accesses to the ROM are clocked at 8MHz and not at the 12MHz rate. This was done primarily because the Mac ROMs are not fast enough for 12MHz. However, it also avoids the issue of any timing sensitive code. The SONY driver has also been mentioned as a possible candidate for problems. Since this driver is ROM based, the 8MHz clocking of the ROM avoids this problem also. Appletalk is RAM based and does contain timing sensitive code. GCC, through an agreement with Apple, will be distributing a version of Appletalk which works on HyperDrive 2000. Any application which uses the ROM based Sound driver should be OK. It is possible that RAM based sound applications could have problems. So far, GCC has not encountered such. Obviously, we are attempting to test all sound related programs we can get our hands on. Feel free to mail me about any you're concerned about. Custom copy protection is truly an interesting area of concern. Since the copy protection is always proprietary, developers rarely are willing to discuss details such as whether or not the code is timing sensitive. GCC will be testing what we can. Anyone who has other issues to bring up should feel free to email it. I'm willing to summarize such stuff to the net if there's interest. Tim Peacock General Computer Company Disclaimer: I am an employee of General Computer Company. As such I am biased towards its products. The message above was an attempt to answer questions being raised on the net, and was not intended as an advertise- ment.