Unibus disk controller with modern storage

[Jon Elson]

On 10/19/2016 07:23 PM, Eric Smith wrote:
> I prefer NOT to use ENIG, as I find HASL tin-lead better for hand 
> assembly, though the lead is a problem due to RoHS regulations in much 
> of the world (but not in USA). I haven't tried HASL lead-free. 
I did **ONE** board with some kind of gold flash that a PCB house 
recommended.
If the solder on the board didn't flow, it was a colossal disaster. You 
had to lift the pin, scrape the black crud down to bare copper and 
re-tin, then solder the lead back down.

Since then, I have used pure tin HASL, and had little trouble.

Jon