[Coco] Coco "Flash2" cartridge progress

[Mark Marlette]

Mark,

Not sure how without A14. I looked at my design and A14 is present and  
then some. More than one way to skin a cat. There is also more than  
meets the eye at first, second glance.

A little hint, all CoCos are not the same.

With the answer I'm sure you will see that you missed a couple of  
important requirements of your design.

The learning is the fun part for sure. Which takes me back to....After  
all these years this machine can still teach you/me something.

I have been in Email contact with two of the designers of the CoCo. I  
would love to meet them face to face someday and just chat. One  
purchased items to play again on it.

Mark
Cloud-9

Quoting Mark McDougall <msmcdoug at iinet.net.au>:

> Mark Marlette wrote:
>
>> We call those equations over here. :)
>
> OK, so maybe I was taking a little poetic license with the word
> "magic", but I was referring to the fact that I had to implement flash
> writes _without_ any signals others than A0 (not A1 after all), D7..0,
> RW# & SCS#... (of course the CPLD generates the flash CE#, OE# signals).
>
>> You will have to include a few more signals and generate some of your own
>> to get the job done. Your learning, as did I. Fun stuff.
>
> Of course I'm learning every day (as we all do in this job) but perhaps
> not at the level you assume... I've been programming FPGAs for several
> years now... ;) Unfortunately I know very little about the Coco, as I'm
> quickly discovering... but that's the fun bit!
>
>> Steve B. did the best job describing the CTS line awhile back and   
>> the difference of ROM/RAM devices and their output. Good words to   
>> follow.
>
> Yes, that's when I discovered that CTS# is not driven on writes -
> *after* I had received the PCBs back from manufacture!!! :(
>
> However, looking at it again this morning, I've realised that I also
> have access to A14, which makes things a bit easier and I can
> more-or-less eliminate the "magic" I was planning... should be
> relatively straight-forward now...
>
> A little puzzle anyone - how do you think I was planning on doing it
> without A14?
>
> Regards,
>
> -- 
> |              Mark McDougall                | "Electrical Engineers do it
> |  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"
>
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