Re: Simplest MMC Interface hardware
Posted: Sat Aug 04, 2012 10:16 pm
HANG ON!
why do you want a mouse
why do you want a mouse
Defence Force forums
https://forum.defence-force.org/
There are really two approaches:highwayman wrote:that's doable,
but if you can show me the software for the ethernet-stack, the usb driver and so on,
that still leaves room for an aplication program i'd be pretty surprised.
the usb already exists on a number of atmel's,
the ethernet is done via a serial port on the same mcu.
see this for an example.
http://tuxgraphics.org/electronics/2006 ... 6061.shtml
you seem concerned about hardware,
as a hardware guy, my concern is getting as much onto the mcu as possible to save wasting ram in the oric.
Yes there are, quite many actually, why? Do you just need few bytes, or do you need a whole bunch of consecutive bytes?highwayman wrote:and repeating my last question, are there any spare bytes in zero-page?
Well, if I understand correctly what you want to do, you'll use some FRAM to store the expansion ROM and have the Oric program it. I guess it would be done by a routine that should be itself loaded from the cassette port ?highwayman wrote:32k of ram - you mean as 2 banks for o.s.?
i keep getting confused about why anybody wants a ram chip.
and the mcu cant write an o.s. image without sitting on the whole address & data busses - that's gonna eat up all my i/o
i'd rather have the expansion rom just written from the oric side.
Please, if you find an alternative to the Ramtron chips, even in 3.3V or less, please let me knowhighwayman wrote:it may be a problem using fram, i think ramtron may be discontinuing 5v parts!
gonna check this and also a slightly inferior alternative.