At 07:05 AM 9/18/2002 -0700, you wrote:
>ADM-3A/HP 6144 Terminal Updates
>
>ADM-3A
>
>I just "restored" a nice brown/beige ADM-3A. I got a
>new CRT for USD 50, and then noticed that this unit
>didn't have lower case installed. What the "lower
>case" option consisted of was a lower case 2513-type
>ROM and a couple of 2102-1 chips, all of which can be
>inserted into sockets on the motherboard. Problem is,
>the lower case 2513 LC ROM is not readily available.
>So I built an adapter to make the multi-voltage 2513
>PMOS chip I had from my other ADM-3A look like a 2716
>to my EPROM programmer/reader. I read the upper and
>lower case chips, programmed a lower case 2716, and
>made a small adapter from to make the 2716 "look" like
>a 2513 in the socket, installed the chips/adapter,
>flipped a few switches, and voila!
>
>This is detailed at
>http://juliepalooza.8m.com/sl/adm3a-2.htm
>
>
>
>I don't think that this is the FIRST time that this
>has been done - but it might be among the last!
Nice! Back in the day, at Purdue University, we modified
a number of ADM-3a terminals with a 2x PROM which
contained an APL character set. We then added a toggle
switch in the little metal plate on the left of the keyboard
and stuck stickers onto the keyboard so that you could
select normal terminal mode or APL mode and program
in APL...
--tom
>HP2644A
>
>I've finished the keyboard, and got some paint that
>fairly matches what I THINK that the original color of
>this unit was. A several-hour long job was the buffing
>of all (all) of the keys - this made a MAJOR
>difference in the appearance of the unit (the keys are
>NOT supposed to be chalky yellow).
>
>I found a source for the unusual tube - but they want
>USD 225 for it! They assure me that they use a type of
>acrylic between the faceplate and the safety glass
>that will never yellow, separate, or grow mold. Still,
>this is a lot of money, and I intend to do the
>hair-raising act of heating a nichrome wire (arriving
>soon) to separate the faceplate from the CRT's safety
>glass/front. Assuming that I survive with minimal
>injury and am capable of writing anything, I will
>detail this operation on my web pages.
>
>If anyone has $225 to spend on a tube, contact me. I
>beleive that this tube was also used on HP equipment
>more worthy of spending $225 on.
>
>
>http://juliepalooza.8m.com/sl/hp2644a.htm
>
>
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Received on Wed Sep 18 2002 - 09:18:00 BST