Re: assembling the IIGS system source code (part 2)

[retrogear <larrygr510@gmail.com>]

On Saturday, March 2, 2013 11:51:11 PM UTC-6, retrogear wrote:
> On Saturday, March 2, 2013 10:07:01 PM UTC-6, Sean Fahey wrote:
> 
> > On Saturday, March 2, 2013 10:10:44 AM UTC-6, gid...@sasktel.net wrote:
> 
> > 
> 
> > 
> 
> > 
> 
> > > 
> 
> > 
> 
> > > But I will try to locate that article.  I am sure it was by someone working on the project at the time it was scrapped.
> 
> > 
> 
> > 
> 
> > 
> 
> > Was it "The Computer That Could Have Changed the World"
> 
> > 
> 
> > 
> 
> > 
> 
> > http://www.wannop.info/SSII//SSII_Index_files/SSII_PDF_files/Volume%203%20Issue%201.pdf
> 
> 
> 
> That article was helpful. It indicates the 3.5 floppy controller is a superdrive chipset which would not be present in the GSPort emulator I am using. I set slot 5 to 'your card' instead of smartport. The system now boots into Prodos-8 on a 5.25 floppy and boots into GS/OS 601 on a hard drive !!! That indicates those chipsets were not changed. This system also passes the built-in ROM diagnostics so that section of rom is good also.

I removed the binary for the modified smartport and superdrive and spliced in the binary $33C00-$363FF from the ROM 03 and now my Twain boots and runs 3.5 
disks too. I will need to disassemble that section to reproduce the correct ROM 03 source. The Twain had a built in SCSI hard drive controller but I didn't find any source code in the firmware for it. I realized I'm able to boot the hard drive because it's built into the GSport emulator.