ArcNet and the Pursuit of Multiple Topologies

Tarsi skrev: A very admirable decision. It depends on the "hybrid" chip on the card. I'll just cut this from the Amiga 4000 hardware guide: ----8<------ The A2060 has some bugs. First, the "hybrid" chip that forms the electronic interface to the Arcnet network comes in two different versions: HCY 9058 (for bus networks) and HCY 9068 (for star networks). As the A2060 manual describes it, the board is for a bus network, but many A2060s come with the 9068 (star) hybrid installed. A bus network needs 93-ohm terminators at each end, and this works fine with the 9058 (bus) version of the hybrid. With the 9068, however, the hybrid itself performs the termination. To connect two machines with 9068 hybrids, run coax from one machine to the other, without using terminators. Using T-connectors to attach more machines in the middle of the bus may or may not work, due to each one adding its termination to the bus. To connect a 9068-version A2060 to a bus network of 9058-version A2060s, place it at the end of the chain and connect the cable directly, without a terminator (this may limit the network to only being operational when the 9068-equipped machine is on). Both versions of the card should have no problems when attached directly to an active hub. It is also possible to replace the HCY 9068 hybrid with the 9058 version, provided you can locate one. ------8<------ There are both active hubs, of which you've apparently got one, and passive hubs, which are just little boxes with a few (four on mine) BNCs on. BTW, I've got a funny ISA ethernet card which may be jumpered between several different impedance levels, so tha tit may be run off ARCnet cabling as well as ethernet and even video cabling, IIRC. Unfortunately none that I'd like to get rid of. But it shouldn't be impossible to buy cable at an electronics shop and crimp/solder yourself. Well, one person in SUGA has a thing called Amigalink, which is some really queer token-passing ring network. It uses D9 connectors at the back on the card, with cables going between D9 and a multi-segmented socket much like 6,3 mm earphone sockets. Those sockets plug into a box which in turn is part of the ring. The official name of the network was the "Superlink unidirectional buffer insertion ring netwrk", and there were adapters for CP/M, MSDOS and Amstrads, too. But this thing is really, really obscure. But I think you should run a piece of ECONET. I think that there is some inital support in NetBSD now thanks to the arm26 portsmaster, Ben Harris(?). -- En ligne avec Thor 2.6a. Vi m?ste vara r?dda om varandra - det ?r det enda reciproka pronomen vi har.