[Coco] ROM Cart registers

[RETRO Innovations]

On 1/30/2016 6:41 PM, Darren A wrote:
> On Sat, Jan 30, 2016 at 5:19 PM, RETRO Innovations wrote:
>
>> Does anyone know the specifics on the SuperIDE, Cloud-9 FLASH cart, or
>> CocoSDC FLASH register layout?
>>
>> I know the bottom 2 bits of $ff59 (default) on teh SuperIDE and the
>> Cloud-9 FLASH cart are the bank register, but not much else as yet.
>>
>> Anyone?
>
>
> CoCo SDC:
>
> $FF42 (duplicated at $FF46) = Flash Data Register
> $FF43 (duplicated at $FF47) = Flash Bank in bits 0..3; Write Enable in bit 7
>
> With the DRGN switch is in the ON position $FF40..47 are swapped with
> $FF48..4F.
> Decoding of all SDC register addresses requires SCS* to be asserted.
>
>
> - Darren
>
Hmmm, so could be:

$ff42/$ff46
$ff43/$ff47

or

$ff4a/$ff4e
$ff4b/$ff4f

What is the Flash DATA register?   Is there a Flash Address register as 
well, or is it that when the user tries to store a value in ROM space, 
you pull the data from this register? since normally data is not 
available on the MPI during a ROM address write?

Jim

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