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bringing the Twain ROM further to life
- Subject: bringing the Twain ROM further to life
- From: retrogear <larrygr510@gmail.com>
- Date: Wed, 24 Apr 2013 18:59:02 -0700 (PDT)
- Complaints-to: groups-abuse@google.com
- Injection-date: Thu, 25 Apr 2013 01:59:02 +0000
- Injection-info: glegroupsg2000goo.googlegroups.com; posting-host=70.35.104.46; posting-account=jKERDgoAAAC7gLN5mRA-DQeBq0YlQi-t
- Newsgroups: comp.sys.apple2
- User-agent: G2/1.0
Ok, a while ago I said I had compiled the Twain FF ROM and got it to boot to the '*' prompt. I put a link to the screenshot:
http://www.macgui.com/gallery/showphoto.php?pic_id=1950
I ASS-u-me-d the system would not boot further because of the changes in ROM and the superdrive floppy driver present. I also stated not too long ago that I had compiled GSport to not put in any patches to the ROM. Well, guess what - when I launched the modified GSport with my Twain ROM the damn thing booted !!! I then used my new checksum routine I just posted to calculate a checksum 'tweak'. It came back with $9B3D. I put that into the Twain hex file at $3FFF6 and now the Twain ROM passes diagnostics !!! This just gets better !!! I tried to insert an 800k floppy and as expected, it reports it doesn't recognize it and wants to initialize. Just for grins, I tried to init and it hung up but I was still able to eject it.
Larry