[Coco] Coco flash

[Ron Klein]

Hi Barry,

I will try this tonight after work.  Please tell your daughter I said
"thank you" for the nice Coco Flash menu system!  ... and thank you as well
for responding.  The information you provided should get me going.

-Ron


On Mon, Mar 20, 2017 at 1:42 AM, Barry Nelson <
barry.nelson at amobiledevice.com> wrote:

> > Ron Klein ron at kdomain.org  <mailto:coco%40maltedmedia.com
> ?Subject=Re%3A%20%5BCoco%5D%20Coco%20flash&In-Reply-To=%
> 3CCANgnoUWU%2BMKuMe8b46%3DRoVtSbLoiPpoi%2BbjmJV2Qq7LMErEQMg%40mail.
> gmail.com%3E>
> > Sun Mar 19 22:39:40 EDT 2017
> >
> > For those of you who own a Coco Flash unit, does anyone know how to flash
> > ROM images greater than 32K?  I understand the concept about 32K ROMs
> where
> > they need to be split in half and the 2 halves are flashed in reverse
> > order.  How would that apply to larger ROMs?  For example, a 64K ROM
> image
> > would be split into 4 equal parts.  In what order are those 4 segments
> > written?  How about 128K images?
> >
> > Thanks
> >
> > -Ron
> Well, I don’t just own one, my daughter and I wrote the programming code.
> :) The CoCo itself only supports up to 32k rom cartridges on a CoCo 3, or
> 16k on a CoCo 1 or 2, but… Certain cartridges have multiple 16k banks an
> special hardware to support that. Fortunately the CoCo Flash imitates that
> very same special bank switching hardware. Unlike a 32k cartridge, which
> really contains a single 32 rom chip that the software has to write in to
> 16k chunks because the programming software just can’t write any more than
> 16k in one pass, these cartridge act like they contain two, four or even
> more separate 16k rom chips that can be selected. Anyway, here is how to
> write them:
> First, just write the 16k segments in order, no swapping. Then when adding
> it to the selection menu data statements, add it like this:
> “NAME OF ROM”,#of_first_bank,34
> Where #of_first_bank equals the number of the first 4k bank that was used
> in the CoCo Flash when you programmed the first 16k of this rom.
> The number 34 in the “type” field of the data statement in the menu tells
> the CoCo Flash to activate the special bank selection circuit that is
> needed for this type of cartridge. Look at Buzzard Bait that was preloaded
> for an example. It is only 32k but uses this special bank switched mode
> since it is designed to run on a CoCo 1 or 2 that don’t normally support
> 32k roms.
>
>
>
>
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