Very impressive.
Maybe someone can combine this with the Cybertech A/V mod (there probably 
isn't enough room for both to coexist separately) and offer it 
commercially.  It's just a drop-in daughtercard that goes into the 6507 
socket, right?  It doesn't require any jumper wires?  The cart port is 
still pretty much the same, right?
I guess you are planning to write the boot-loader so you can load games 
directly through RS232 rather than cart.  Since 32K linear RAM is a nicer 
memory model to work in I'm assuming that if you wrote a game on cart you'd 
probably want to store the game like a file in banked ROM and have a loader 
routine copy it all to RAM and then jump into it.
Plus, with the RS232 then you could write a simple client-server app on the 
PC that could read and write files on demand for the 2600, which could also 
be used in mid-game for levels, high-score saves, etc..
You could write a pretty massive RPG that way.
I know you can still do something like this by sacrificing a joystick port 
by using a Cuttle Cart/SC but you just can't hold much RAM at a time that 
way so you'd be requesting loads pretty constantly.
How fast do you think the serial could go with the stock 2600's 6507 clock 
speed?
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