[sebhc] H89 roms

Lee Hart leeahart at earthlink.net
Thu Dec 15 20:39:45 CST 2005

Robin England wrote:
> That's great news about the MTR ROMs, Lee. I'm waiting anxiously for a copy
> of the 444-142, but there's no pressure...   ;-)
> BTW, does anyone already have binaries or logic diagrams for the PALs used
> as memory and I/O map decoders (U516 / U517 / U550)? If not, perhaps we
> should look at 'probing' these?

They are not PALs, they are PROMs. I have the binaries for these, as well as 
the programmer for them. The address decoder is 32x8, and the I/O decoder is 
Lee A. Hart    814 8th Ave N    Sartell MN 56377    leeahart at earthlink.net
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