Good progress for APPLE IIGS

I am working for APPLE IIGS with SD DISK][ Emulator.

SD DISK][ Emulator RW BIOS doesn't good for APPLE IIGS cause of some timing issue there.

And I decide to change main RW routine but ROM BIOS also have to changed.

The performance of Hard disk have to reduced for stabler and apply for IIGS. 

Please see the picture.

It has some reading issue so internally retry few times.

Someday can support for IIGS too.

Thank you

IAN KIM