[Coco] CoCoSDC utility for OS-9?

[Allen Huffman]

> On Jan 20, 2015, at 10:16 PM, Bob Devries <devries.bob at gmail.com> wrote:
> 
> Rather than muck around with the existing image, I extended it and made the extension into a second partition. I used HxD to do the extension on windows 8.1. I created a descriptor (I called it SDA) and set its OFS to 4800
> 
> Here's a dmode of the "partition"
> 
> nam=SDA mgr=RBF ddr=rbsuper
> hpn=07 hpa=FF4A drv=00 stp=00 typ=80 dns=00 cyl=00F6 sid=40
> vfy=01 sct=0020 t0s=0020 ilv=01 sas=10 wpc=00 ofs=4800 rwc=

Dusting off memory cells…

The original image is 4800 sectors, I take it? Offset skips that. By creating a new descriptor, writes to it would extend the file (but you extended it manually earlier). Interesting.

Size is F6 (tracks) * 0x20 (sectors per track) * 0x40 (sides) * 256 (bytes per sector) = 128974848

128MB. I see.

Any specific reason for doing cylinders at F6 and sides at 40 versus other combinations that would result in the same number of tracks? Is there some CoCoSDC things I need to be aware of with descriptors?

		— Allen