🚀 go-pugleaf

I am in the process of building a GAL programmer from programming
specs I got from National Semiconductor.

(Unfortunately that's under non-disclosure, so I can't give the specs out.
Just in case someone asks.  It is a shame that the GAL manufacturers don't
make their programming specs available to the public.)

I have a few questions about the JEDEC file format used for downloading
fuse maps to programmer.  Is there a machine readible description of
the JEDEC format available from ftp ?

There are a few of the commands I can't figure out:
(All of these are found in Nation Semiconductor OPAL JR examples)

1)  QP20   <- Is it # of pins ?  (20 right ?)
2)  F0     <- No idea what this might be
3)  C6743  <- Is it the checksum (in Hex) ? How is it computed ?

Does anyone know whether or not the newer devices (22V10, 18V10 from
Lattice & others) have similar programming pins as their respective 20,
24 pin counterpart ?

Thanks in advance.

K. C. Lee
Elec. Eng. Grad. Student