[Coco] Flash updated Dragon DOS into SDC... help!

Zippster zippster278 at gmail.com
Thu Mar 10 17:47:34 EST 2016

Hello Rogelio,

The load address and file length should be in the .bin file 5 byte preamble (header).
You can check it with a hex editor, I’m not sure what Pere used.

The second and third bytes is the file size, The fourth and fifth are the load address.

This may be helpful…

<https://sites.google.com/site/thezippsterzone/coco-sdc-pages/coco-sdc-writing-flash-banks <https://sites.google.com/site/thezippsterzone/coco-sdc-pages/coco-sdc-writing-flash-banks>>

- Ed

> On Mar 10, 2016, at 4:31 PM, Rogelio Perea <os9dude at gmail.com> wrote:
> Got far up as to get the newest Pere release for the Dragon  onto a DSK
> image as a BINary file in the virtual disk.
> I am using my CoCo 1 setup to attempt and flash the DOS into the SDC. After
> changing the jumpers I can see and mount the DSK image from the SDC. I was
> about to do the flashing when a reflection about where in memory is the BIN
> file being loaded to hit me - this, as far as I know - would be a crucial
> bit of information to later issue the proper WRITE command to store the DOS
> in the SDC flash memory, bank 7 as I opted to use.
> Right now my Dragon use SDC has DOSPlus on bank 4 and SDC DOS on bank 0.
> I know the BIN file of the newest DOS is about 14,xxx bytes long (my notes
> are upstairs, too long of a trip hoping on just one foot - long story) and
> that the file's first two bytes are 'D' and 'K' as a proper DOS would have.
> Also known the fact that for regular ML programs there is a way to snoop
> out loading and exec addresses but... I have never tried programming a DOS
> outside the world of EPROMs.
> What would be the proper way to proceed? LOADM the BIN file and then WRITE
> to the flash I figure but where would the CoCo load the file into memory to
> then properly set the WRITE parameters to flash the image?
> -- RP
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