dlyons@Apple.COM (David A. Lyons) (07/31/90)
Todd Whitesel writes, in a message that apparently went out to info-apple but hasn't shown up for me on comp.binaries.apple2 yet: >Getting the O/S to use it would not be very difficult, but it would play hell >with some of the worst-designed (i.e. GS hardware specific) QuickDraw calls. >Most window-based programs would still work, but many of the paint programs >wouldn't be able to use the new graphics mode without substantial modification. >[...] >Todd Whitesel >toddpw @ tybalt.caltech.edu I have to disagree about what the difficulty would be in modifying QuickDraw to use 400 vertical resolution with the video overlay card. QuickDraw is definitely based on the assumption that pixel maps are in arranged linearly, so that the two adjacent scan lines come right after one another in memory. With the video overlay in interlace mode, they alternate banks. Ouch. What *hardware specific* calls are a problem? Stuff like SetAllSCBs? Those could be patched--that's what a toolbox is for (to *keep* flexibility in applications by being able to revise the system software to give the applications increased functionality later). -- David A. Lyons, Apple Computer, Inc. | DAL Systems Apple II Developer Technical Support | P.O. Box 875 America Online: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.