Hi all,
I'm looking for some info on the 2050. The parts list identifies the dsp as
a modified uPD7720 and gives its part number as 351-8869-020. The ICs are
labelled as 3518869020 so I assume the modification was to the die and was
modified NEC as a special for Collins?

Anyone know what the mods are and whether a stock 7720 can be used as a
replacement?

I was thinking about installing U14 for the ISB.

Otherwise, anyone have any of the DSP ICs 351-8869-020 available? or perhaps
a complete A3 board?

While I'm at it, anyone know what U15 is/was for?

Thanks
Greg

gcd. at. iimetro. dot. com. dot. au