Heath8080A — Additional Resources
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Technical Reference Material
Here are some useful links to other technical resources:
H8 Emulation Help — This is the complete help system that is distributed with the emulator, which includes:
...and a whole lot more.
The 8080A programming section includes a good summary of each machine instruction along with an octal opcode reference summary, so the one that used to be here has been removed.
Disclaimer: All but the most trivial code samples have been tested, and the text has been carefully reviewed, but mistakes do get through. After all, there is over half a meg of text and formatting here.
Also, note that this guide was formatted for the Macintosh help viewer. There may be (in fact, are!) some display problems here and there when viewing this material on a normal web browser. Such is life.
8080A Programming Card — This is a terse but comprehensive instruction summary. The format is ASCII text.
8250 UART Technical Details — The 8250 chip in detail, including hardware operation and software programming, from Dave Wallace's site. HTML format.
Other Heathkit Links
Here are some other Heathkit, H8 and other microcomputer links you might find interesting:
Heathkit — Yes, they're still out there! The website only shows their educational products, but I'm told that they still sell documentation and some parts. Call them for info.
Dave Wallace's H8 Emulator Page — Dave's H8 emulator is (a) targeted at Windows NT, and (b) up and running. The web site has interesting history of the H8 and hobby computing in general, with considerable technical background on the H8. His description of "virtual time" alone is worth the visit.
Vintage Computer Festival — "The mission of the Vintage Computer Festival is to promote the preservation of "obsolete" computers by offering people a chance to experience the technologies, people and stories that embody the remarkable tale of the computer revolution."
The Heathkit Virtual Museum — Dedicated to Heathkit radio products, though it does have a picture of an analog Educational Computer that was once marketed by Heathkit before even my time.
8-Bit-Nirvana — Sogar in Deutschland, moegen sie das H8.
Bill Wilkinson's Heath Company Page — Bill Wilkinsen's tribute to the Heathkit company and its products. Has a number of additional resources, including names and e-mail/web addresses of a number of the people in the Heathkit computing community.
In addition, you can get interesting information from the comp.sys.zenith and comp.sys.zenith.z100 Usenet newsgroups. And quite a bit of the information I gathered for this project came from folks who hang out at alt.folklore.computers. The H8 is old enough to have developed folklore... My my.
If you know of any other interesting Heathkit sites, and especially H8 sites, that I might add to this link page, please send them to me.
Credits and Contributions
This project would be a complete failure if it weren't for the help of a number of total strangers who responded to a plea blatantly cross-posted on a number of usenet newsgroups, and in some cases to unsolicited e-mail. Some have gone to considerable effort to put together packages of material, upload software to me, and dig out key bits of documentation.
If you think that civility and a sense of community is dead in the modern world, try looking up one of the original computer hobbyists from the late 1970's. All we had back then was each other. We learned to share.
A partial list of contributors follows. There are others but I don't have permission to list them here.