[Coco] Burning EPROMs, ADOS and ADOS-3

[Arthur Flexser]

The file should definitely start with the DK characters;  whatever is
before that should be lopped off.

Art

On Sun, Nov 23, 2014 at 7:17 PM, Rogelio Perea <os9dude at gmail.com> wrote:

> Trying my hand at burning a couple EPROMs for my CoCo 1 & 3 setups, got the
> customized ADOS and ADOS-3 files (.BIN) ported to my Weven system to
> program the 2764s with those images - using a China made TL866CS MiniPRO
> burner.
>
> After burning two 2764s - each from its own .BIN file - I installed the
> chips on a 26-3029 (with an adapter for the 28 pin to 24 pin scenario
> there) and a FD-502 controller (just a drop in on this one). Testing both
> on each computer got my only ECB, apparently the CoCo is not reading the
> DOS.
>
> Snooping around on an image of the previous EPROM I had on the FD-502
> (RSDOS 1.1 modified for 6ms step rate and 'double' sided drive operation),
> I see that the first two bytes on this one relate to the ASCII characters D
> and K (Hex 44 and 4B); the images for both ADOS and ADOS-e BINary files
> have a string of Hex 00 20 00 20 00 20 at the base with Hex 44 and 4B
> coming after those... I suspect there is something amiss on the BINary
> files I have, lost in the haze of my aging memory  recall something from
> years ago about trimming (or padding) the BIN file as read from the CoCo
> because of the way it is written on disk, before committing to the EPROM
> burner...
>
> Any hints on this will be welcome
>
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