taob@micor.ocunix.on.ca (Brian Tao) (05/19/91)
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? -- 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."
daveh@ccwf.cc.utexas.edu (Dave Huang) (05/20/91)
In article <RFB823w162w@micor.ocunix.on.ca> 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 |
mattd@Apple.COM (Matt Deatherage) (05/20/91)
In article <RFB823w162w@micor.ocunix.on.ca> 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? > >-- >Brian T. Tao *B-) | taob@micor.ocunix.on.ca | "Though this b I think I accidentally started this rumor a couple of weeks ago when talking to some people online. It was part of a "which of these things isn't true?" contest to which I refused to give the answer. :) It's totally false. There is only 64K of DOC RAM on all IIgs systems, and it's not switchable. -- ============================================================================ Matt Deatherage, Developer Technical | The opinions expressed herein are Support, Apple Computer, Inc. | not those of Apple Computer, and Personal mail only, please. Thanks. | shame on you for thinking otherwise. ^^^^^^^^ Technical questions are not personal. Please post them instead. ============================================================================