[Coco] Coco "Flash2" cartridge progress

[Mark McDougall]

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!"