To begin with a big thanks to Indra for relaying my mail
when I was down and out !
"M.K.Laha" wrote:
> > > R u aware of places where they will sell me etching
> > > chemicals ( that is without arresting me !!!). I want to
> > > make a PC Board (ISA) for EPROM writing.... Have the circuit
> > > and all... Could you find out if anyone in the ILUG knows
> > > where (in Cal, if not then where in India ...) I can find a
> > > board for double sided etching ( Try the JU guys...)
>
> I haven't done this in the last 10 years but General Radio Corporation
> (GRC) at 6, Madan Street should have 2-sided PCB blanks and they don't
> cost the earth by any means. They should also be having the right kind
> of masking tape. Hot concentrated ferric chloride solution is all that
> is needed to remove the unwanted (and therefore unmasked) copper. Ferric
> chloride is obtainable from any shop selling chemicals (College St,
> Middleton Row, and I don't know where else) and one doesn't get arrested
> for buying it. Getting the etching right takes some experience, though.
#1. I have the PCB Layout and have printed it out on paper
and it seems to be of the right size and need to transfer it
somehow onto the board. I know that this invovles some way
of tranferring the design using UV or something but HOW ???
#2. Last time I went around asking for chemicals like
Glacial Acetic Acid ( to make cooking vinegar) and Lab grade
IsoPropyl Alcohol I was told that these stuff apparently can
be used to make explosives and hence purchase would involve
incurring the wrath of the police !!!
>
> All said and done, it would be best if a ready-made PCB fits (or is
> patched to fit) the bill. GRC again.
#3. I can't find one that will fit both the bill and my
(very limited) pocket ! This is to write BootROMs on EPROMs
without using a fancy (& way too expensive) EPROM Writer...
All I need to do is to make a Boot ROM for the ISA network
card for a Diskless Workstation running X as I can't afford
a HDD.
I would be VERY happy... Hmmm! Let's say ECSTATIC if someone
has an alternative solution ...
>
> - Manas Laha
Thanks
INIGO
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