I was looking for my e-mails on the net ideas and noticed I didn't even read your reply (it must have been off screen when I recived it...) Looks like a good idea... what's the cost in general for such chips and are they readily avialable still? I am looking for the low cost method, will keep doing what I have as it requires only connectors and wires, but something along the lines of localtalk protocol/topology would be more usefull for general purpose work. I am not much of a hardware (electonics) person myself. Ethan Dicks wrote: > > --- Larry Anderson <email@example.com> wrote: > > After a little thought about the throughput of the network (ok, I havent > > got 'that far', but I like to plan ahead), I am thinking we can get > > increased speed with more data moved between nodes and less transitions > > (input to output) than going around the ring with each node's data > > (packet->in/out/in/out/in/out ->next packet)... > . [snip!] > Have you ever worked with FDDI or Arcnet or any token-based networking > scheme? If a token is lost, there is always a mechanism for regenerating > the token. Can't go around rebooting servers in a production environment > just because they lost connectivity for a moment. > > Depending on what you really want to do, there is a one-chip ArcNET solution > that is as easy to attach to a 6502 as an ACIA - the COM20020. Dave Haynie > tried to design it into several Amiga models, only to have management remove > it due to cost. His idea was self-terminating RCA jacks (like the ones in > the front of modern VCRs for audio/video - they short out if there is no > plug installed (with a termination resistor in the Amiga's case), or if you > insert a cable, the internal short is opened and the connector passes data. > A low-tech no terminator solution. Think of LocalTalk adapters but cheaper. > > If you use an RS-485 driver chip (8 pins, <$1 each), it's possible to build > a twisted-pair, multidrop ArcNET network. The COM20020 has built-in buffer > RAM, enough for a full packet. You don't have the same problem with data > underruns because of how ArcNET works. It's not broadcast like Ethernet. > > It all depends on what you are really trying to do here, but if a hardware > solution is called for, consider this chip. There's a schematic I worked > on *years* ago (1987?) for an Amiga parallel port ArcNET adapter. I never > built one and we never wrote drivers, but I got questions about it for several > years. I'm pretty sure it's on AmiNET. A search for pocket.lzh might turn > it up. It's not much more than a COM chip, a line driver and a crystal. > Easy as pie. The software is another matter entirely. You'd still have to > implement some kind of protcol stack for the higher layers, but at least > you would be able to get bits from one box to the next from the get go. > > Other schemes might make more sense if they only require a cable and possibly > a line buffer. Depends on the goals. -- 01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101 Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363 300-14.4k bps Classic Commodore pages at: http://www.jps.net/foxnhare/commodore.html 01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011 - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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