[Coco] Reading DOS Rom

[Steven Hirsch]

On Mon, 16 Feb 2009, John Eric wrote:


> my programmer didn't support the 68xxx series /rom/eproms, so I stuck a 

> 24-pin socket on top of a 28-pin socket bottom justified with pins 24, 

> 21 and 18 bent out.i then wired pin 24 of the 24p socket to pin 28 of 

> the 28 pin socket, pin21 of 24p to pin 2 of 28p, pin18 of 24p to pin 23 

> of the 28p. Then i placed the rsdos rom into the 24p socket and plugged 

> the contraption into my eprom burner and read it as a 2764. Of course, 

> you should verify my wiring to make sure i haven't messed anything up.


I ended up doing the same thing, but with machined-pin sockets.  Not 
really a lot of fun, but it worked fine.  I'm going to put a ZIF socket on 
the top to avoid repeated inserts and removals.

After capturing the image, I was able to create a dual-personality ROM 
for my floppy controller.  Standard Tandy image in the bottom half and 
Cloud-9 HDB-DOS in the top (I'm using Mark's little adapter).

I'd actually like to mount a switch on the cart case to select between 
them, but it doesn't look like there's enough clearance anywhere.

Has anyone else done this?

Steve


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