Re: Todd's ELF-ish to get an FDC #Homebrew #microboards

Lee Hart
 

From: "Mike McLaren, K8LH" <@K8LH>
Ok, here's an untested design for inserting both ROM and I/O into the address space...
Here's another trick. Since ROM is read-only, you can map write-only I/O (i.e. output ports) into the ROM memory space. This can be useful (for example) as video RAM.

I used this trick on the 6502 badge to map its LED display outputs into the same memory space as the ROM.

Lee



--
Excellence does not require perfection. -- Henry James
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Lee A. Hart http://www.sunrise-ev.com

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