Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu From: daveh@ccwf.cc.utexas.edu (Dave Huang) Newsgroups: comp.sys.apple2 Subject: Re: DOC RAM on ROM 03 Message-ID: <49216@ut-emx.uucp> Date: 19 May 91 17:24:35 GMT References: Sender: news@ut-emx.uucp Reply-To: daveh@ccwf.cc.utexas.edu (Dave Huang) Organization: The University of Texas at Austin Lines: 22 In article taob@micor.ocunix.on.ca (Brian Tao) writes: > I've been told that there is some sort of "softswitch" (an undocumented >feature?) on the ROM 03 machines that will let you bank-switch two 64K >chunks of memory in and out of the Ensoniq's DOC memory. Someone else >pointed out that this feature "has been around since the first system". I >have never heard of such a thing. Can some verify this? Yes, there is an extended addressing thing in one of the DOC registers, but since all GS's have 64K of DOC ram, that bit should always be 0. It's a DOC feature, not a GS-specific feature, so it's been around since ROM 00, but you can't do anything with it. There were rumors that ROM 3 had 128K of DOC ram, but they were just rumors... >-- >Brian T. Tao *B-) | taob@micor.ocunix.on.ca | "Though this be >2705-1510 Riverside | - or - | madness, yet there >Ottawa, ON K1G 4X5 | taob@micor.uucp | is method in 't." -- David Huang | Internet: daveh@ccwf.cc.utexas.edu | "Help! My ganglion is UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | stuck in some chewing gum!" America Online: DrWho29 |