Suggestions for VT103?
ard at p850ug1.demon.co.uk
Mon Dec 29 12:34:15 CST 2008
> So forgive my inexperience here -- but just to make sure I'm
> understanding the changes I need to make -- is all that's necessary just
> wiring up the address lines (18-21) from slot 1, to slot 2, to slot 3,
> to slot 4?
Yes, but I think it's _twice_ on each slot (the Q-bus being based round
dual-height boards). So a total of 8 points to link for each of 4 wires.
But it is just a matter of running wires between those points and
soldering them down.
> Also, just to satisfy my curiosity -- it's been mentioned by several
> people that lead-based solder is necessary -- why is this? (I think I
Is there ever a good reason not to use leaded solder in homebrew stuff
and classic computer repairs (neither of which come under any RoHS
directives in the UK)?
It is a very bad idea to mix solders, the worst way, or so I am told is
to use lead-free solder on a PCB that was originally soldered with leaded
solder (the VT103 certainly was!) The resuling lead-free solder
contaminated with a little lead produces a very poor, brittle, joint.
> have a spool of it somewhere that I liberated from my grandfather's
> basement some years back, but I'll have to dig it up...)
This is electornic-grade resin-cored solder, I hope!. You can still buy
leaded solderm at least in the UK, fortunately.
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