Hey all, I'm primarily a lurker here on this group. I recently was cleaning out a storage area and came across my Elf collection. I thought I'd list the...
Computer Builders, I suppose the sane way to make a qwerty keyboard for an Elf is to start with an inexpensive PC keyboard. Maybe strip out the electronics...
Hey Dan, Thanks for the heads up about your ELF documents and experience. It seems a little quiet on the board these days but maybe you'll stir up some...
This was a little project I did to interface a PS/2 keyboard to vintage computers. http://www.tinymicros.com/wiki/KeyMapper Unfortunately, after the prototype...
Neat idea... After seeing various laptop xboxes, Atari's and the like, I wondered if someone would be inspired to do the same with an 1802 based compute. If it...
the blue hat thing is certainly fugly but I can see the attraction. have you looked inside one to see what the lcd itself is and how the keyboard is handled?...
This has been going on for a few years. A chip I did at HP back in 1994 was the first single chip geometry accelerator (3D graphics engine). It had way more...
If I recall the 9845C was the same. The color display engine was a 2900 bitslice that had more power than the main processor. Or was that the other way around?...
... There's also the MSI/88, which is probably the neatest pre-made package for an 1802 "laptop". Search the old messages in this group for MSI/88 and you...
oh, that idea is still kicking around in a few heads. I received one over the winter courtesy of a board member and I'm waiting for a (hopefully) compatible...
... I think the most straightforward way to provide a keyboard (and display) is to get an old (*very* old) laptop, and use it as a serial terminal. These...
Hello, I was going through all my old parts and came across a tube of CDP1832E chips. I read an older post on this group that mentioned these are 512x8 ROM...
Robert, I am definitely interested in the CDP chips. Gary Sent via BlackBerry by AT&T ... From: "Robert L. Doerr" <rdoerr@...> Date: Mon, 19 May 2008...
... Hello Gary, I have a full tube of the chips but will need to check them out when I get home to count and see exactly how many chips are there. I would...
Thanks, Robert. I am interested in all the CDP chips. I have been collecting all the pieces and will begin building, hopefully soon. I travel too much, which...
OK, I know the editor and assembler of the ELF2000 is a very basic version that should get you through most small projects, but these problems are just...
... That's an odd one. Could it be a 2104? That was an early Intel dynamic RAM chip. -- Ring the bells that still can ring Forget the perfect offering There is...
Hello, I found this for the Intel D2004 parts on American Microsemiconductor: Non-Volatile (NVRAMs) Static RAM, 512x8, 28 pin DIP, 250 ns access & write time. ...
... I'm a fan of minimalist solutions, of which the 1802 is an excellent example. In the interest of "Running Light without Overbyte" as Dr. Dobbs used to say,...
I'm thinking about it, but having trouble visualizing how this works. Is there a simple diagram, maybe with 1 or 2 diodes and a switch that can illustrate? ......
Here's an excellent example of a DIODE ROM: http://www.instructables.com/id/SFB83G9FBVHE7GG/ This one is for 7-Segement Display Decoding. OLD SCHOOL :-) ... ...
... Thanks for the diagram, but I have another question. Why are diodes used instead of wire jumpers? I looked for a way that current could flow the wrong way...
Wire jumpers instead of diodes is not a workable solution at all, since everywhere you have a jumper you'd have a short circuit. By using diodes, they'll only...
Lee Hart ... From: Patrick Draper ... Let me try some ASCII art. View it with a fixed-width font like Courier. This circuit has 4 switches ("0", "1", "2", and...
very nice lee. And Patrick: Look at the top group of four diodes. If you replaced them with wire jumpers you would be connecting all of the vertical runs...
I've been looking for a chess program running on a 1802. I found the Mephisto Chess Computer I, II and III using a 1802, later a 1806. Some nice photos can be...
That's something I've been thinking about as well. There used to be a program that was around in the early 80's that would have the Elf play a fairly static...
