In SX Microcontrollers, SX/B Compiler and SX-Key Tool, cbmeeks wrote:

Ok, I am building a 6502 based computer.  The 6502 needs ROM to work.  I can't afford a EPROM burner but I have a few SX28s around.

Anyway, here is my idea of turning an SX28 into a ROM chip that the 6502 can read.  Please let me know what you think (try not to laugh too much!)

1) Take PortC as the data bus (all outputs)

2) Make PortA and PortB the address bus (all inputs).


Now, I know that would only be 12 pins address bus which is 4k.  I also realize I would lose some for the coding logic.

But even if I got a good 2k of usable ROM, that would be enough for some neat programs.

So, I thought of having the SX detect the inputs as a binary address and then jump to a location in FLASH memory and output on the databus.

What do you think?  Am I crazy?  lol

Thanks!

cbmeeks

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