[aprssig] Can you make this out?

[Dave Baxter]

Hi.

You can put the image of a 27x256 in the top half of a '512 and in most
hardware it will run OK just like that.

If all else fails, make two images, in top and bottom half's of the '512
and it's 99.9% certain to run!  No hardware changes needed on the host
board for that, unless you *need* to address more than 32k of ROM.

Even then, it's often no more than one knife cut and a bit of Kynar wire
to run for the extra address line, so long as A15 is actually available
for use of course!

Dave G0WBX.


> -----Original Message-----
> From: Ron Stordahl [mailto:ron.stordahl at digikey.com] 
> Subject: Re: [aprssig] Can you make this out?
> 
> Yes, he is running TheNetX1J4 firmware, which requires a 
> 27C512.  Since it is a 1270B, he has made some slight mods to 
> allow it to run with a
> 27C512 rather than the usual 27C256.  It would not be hard to 
> get it back to shape to run UIDIGI with a 27C256 which you 
> would have to burn.  
> See http://groups.yahoo.com/group/uidigi/
> 
> Ron, N5IN
> 
> Fred Atkinson wrote:
> >      I'm talking with a fellow who has a TNC he's willing 
> to part with.  He tells me that it is an MFJ-1270B.  I asked 
> him what version of firmware is in it.  He emailed me the 
> contents of the login screen.  It is as follows: 
> >
> >                TheNet X-1J4 VK2AMW-6 
> >                By DF2AU/DC4OX/G8KBB
> >
> >      Can you make any sense out of this and tell me if this 
> firmware is suitable for our pending APRS digipeater?  
> >
> >      Regards,