Comments on: Apple’s Enhanced Computer, the Apple IIe http://blog.modernmechanix.com/2008/06/02/apples-enhanced-computer-the-apple-iie/ Yesterday's tomorrow, today. Sun, 22 Nov 2009 04:15:36 -0800 http://wordpress.org/?v=2.8.4 hourly 1 By: Fred Wendel http://blog.modernmechanix.com/2008/06/02/apples-enhanced-computer-the-apple-iie/comment-page-1/#comment-1066108 Fred Wendel Wed, 25 Feb 2009 19:18:25 +0000 http://blog.modernmechanix.com/?p=4535#comment-1066108 I have an Apple IIe computer for sale. It is in excellent condition along with monitor, ImageWriter, program disks, manuals, and floppy disks. I have an Apple IIe computer for sale. It is in excellent condition along with monitor, ImageWriter, program disks, manuals, and floppy disks.

]]> By: Rick Auricchio http://blog.modernmechanix.com/2008/06/02/apples-enhanced-computer-the-apple-iie/comment-page-1/#comment-1056330 Rick Auricchio Mon, 02 Jun 2008 23:58:31 +0000 http://blog.modernmechanix.com/?p=4535#comment-1056330 Cool! Now I have proof of my fifteen minutes of fame! No doubt I had a copy of the article decades ago, but it's long since discarded. I like the photo of the "Flash" prototype; others are on my web site at http://www.cfcl.com/rick/personal/apple2e.html Much of the challenge of modifying the ROM code was because assembly-language programs would simply jump into routines in the ROM. Most were fairly easy to recode, since we had room to relocate small blocks of code elsewhere in the ROM. One, in particular, was tricky, because it had two entry points, two bytes apart. There wasn't room to insert a 3-byte JMP instruction between them. Late one night, Bryan Stearns (who just participated in Apple's WWDC "Stump the Stars" program) recalled a coding trick used earlier on one of the serial I/O cards. It was a tacky hack wherein the earlier entry executed normal code, but the later entry executed part of an instruction. Jay is probably one of the few who remembers (or can find) the "SEC BCC +18" hack at CLEOL/CLEOLZ. Cool! Now I have proof of my fifteen minutes of fame! No doubt I had a copy of the article decades ago, but it’s long since discarded.

I like the photo of the “Flash” prototype; others are on my web site at http://www.cfcl.com/rick/personal/apple2e.html

Much of the challenge of modifying the ROM code was because assembly-language programs would simply jump into routines in the ROM. Most were fairly easy to recode, since we had room to relocate small blocks of code elsewhere in the ROM.

One, in particular, was tricky, because it had two entry points, two bytes apart. There wasn’t room to insert a 3-byte JMP instruction between them. Late one night, Bryan Stearns (who just participated in Apple’s WWDC “Stump the Stars” program) recalled a coding trick used earlier on one of the serial I/O cards. It was a tacky hack wherein the earlier entry executed normal code, but the later entry executed part of an instruction. Jay is probably one of the few who remembers (or can find) the “SEC BCC +18″ hack at CLEOL/CLEOLZ.

]]> By: jayessell http://blog.modernmechanix.com/2008/06/02/apples-enhanced-computer-the-apple-iie/comment-page-1/#comment-1056299 jayessell Mon, 02 Jun 2008 13:32:40 +0000 http://blog.modernmechanix.com/?p=4535#comment-1056299 Thanks Charlie! Rick (and my friends new and old) check out my Apple photos and videos: http://video.google.com/videoplay?docid=5527308473610248626 http://www.flickr.com/photos/8740359@N04/sets/72157602911970794 http://youtube.com/watch?v=lbxJajIGBWo http://youtube.com/watch?v=-kwDLEOTPhA http://youtube.com/watch?v=XUVjp07AuKw 14:48! Thanks Charlie!
Rick (and my friends new and old) check out my Apple photos and videos:

http://video.google.com/videop.....3610248626

http://www.flickr.com/photos/8.....2911970794

http://youtube.com/watch?v=lbxJajIGBWo

http://youtube.com/watch?v=-kwDLEOTPhA

http://youtube.com/watch?v=XUVjp07AuKw

14:48!

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