ADM-3A/HP 6144 Terminal Updates

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! 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 __________________________________________________ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com