TRS-80 Model IV PALs

4 Dec 2019

I have a TRS-80 Model III with a IV upgrade in it (non gate array).

I have a hunch that one or two of the HALs are bad (the primary one 
being 8075208).

Anyone have the JED files to program any of these HALs into PALs or 
GALs ?

Anyone know a source for these ?

Anyone know if these can be read, or if they are protected (for 
example, if I were able to borrow some working ones, could they be 
duplicated ?) ?

Thanks,

-- Curt