Bought in March 1976 in Berkely. 2Mhz 8080, and 4K RAM with only the front panel for about 2 months. Then added the Processor technology VDM-1 16X 64 Video card, 3P+S I/O card and a CUTS casette tape interface. When I added the GPM memory board with a 2K byte ROM Monitor, it was actually easy to read a game in from casette and actually use the computer for something. (Target and TREK-80 for the win!) I eventually added some more RAM - 16 K Dynabyte cards and a North Star micro-disk floppy system. The system eventually evolved to a Z-80, CP/M 80, 60K RAM and a Morrow 16 Megabyte Hard disk.
       

Nope, not concurrent. I worked at a fairly large supercomputer center in the S.F. Bay area. We had to build all of our own I/O systems and networks as this was before CISCO etc.

OZ

Actually, for long-haul bulk power, HV DC transmission lines are more efficient than HV AC lines. I took an on-line college class in power generation and distribution systems last year and was surprised to find out that HVDC did not have as much loss as the AC lines. The losses were due to distributed reactance in the lines, both capacitance to ground and series inductance in the wire. These effects are important at the 230KV level.

OZ

In the 80's we built custom interfaces for large computers using wire-wrap Standard Logic Inc. wiring modules. The planes of wiring were assembled into rackmount chassis which were fed DC power via a vertical bus-bar system in the rack. The busbars were about .5 X 1 inch solid copper, insulated by shrink tubing with holes cut for the threaded holes in the busbar. The power supplies were rackmount 100 or 200 A Lambda supplies providing either 5 volts or 12 Volts. It was occasionally a pain to be called into the computer center in the middle of the night to replace one of those heavy power supplies - at least they were at the bottom of the rack.

OZ

John DeArmond has a good article on his site about the $100 1KW Chinese-made generators sold at Northern Tool.

http://www.johndearmond.com/2008/12/24/the-generator-that-could/

Enjoy,

  OZ

I have DSL and cable. I also have a D-Link DL604 load balancing router. It sucks.

The router seems to think that as long as the physical ethernet connection is up, the provider is up. It tends not to detect network failure. There are ways to set up a periodic monitor of some host to detect if the network is up, but it does not seem to work properly.

What I want from this thing is:
Lock SMTP to one port and thus one provider. My AT&T DSL SMTP server will not accept mail from my Comcast account. (this is correct behavior for anti-spam). The DL 604 does this correctly.

I want the router to send any new connection for a naive (not currently in routing table) external network to both providers. I want it to measure the response time ( over a number of packets ) and then lock the route to the network which provides the best performance. It can periodically re-test the routes - perhaps every 5 minutes or so. This should address the problem of non-neutral peering between various providers. It is not always true that the higher bandwidth cable connection is the best connection to where I want to go. If I am accessing a client's machine who is on AT&T DSL, my DSL connection may be faster than my cable connection. I want the router to deeply inspect the traffic and be able to detect if a session breaks on a particular WAN port, and try the other. I also want it to quickly recognize when all sessions on a particular WAN port break and switch to the alternate port, while testing the original port.

I want built-in diagnostics that can show me how often a provider drops the ball, shiny graphs of bandwidth and latency etc. It would be cool if the router would allow me to see what the instant connection graph between my LAN and external networks looks like. ( which of my hosts connect to which external domains at the moment ).

I would like to be able to see graphics of IP address / port scans.

I want the router to be able to do some intrusion prevention, particularly if no one is using my network at the moment - someone tries to scan - shut the thing off for a while. ( do I care if I DOS myself if I am not using the net? NO! )

There is a hardware provider http://www.routerboard.com/ that can provide multi-wan multi-lan and wireless router hardware for cheap. They also have software but nothing that does all the tricks I want...

Coders, here's a base spec, send some bits!

OZ