stewe@opal.cs.tu-berlin.de (Stephan Wenger) (06/03/91)
Thank you all for your mail concerning my problem with the c004. It seems to be well known by some people. Here is the summary: First, some people suggested to use F series chips instead of ACT (or AC) chips for the line buffers. From: gerst@kodak.com We had 74ACT244's for buffering transputer links between two boards plugged in to a backplane. We found that the 74ACT244's were very susceptible to ground shift problems and sometimes caused data errors. The problem went away when we tried 74F244's. Second, there are problems with the network-tester of the tds2: From: Andy Rabagliati <andyr@inmos.com> Death to the network tester. Your application is probably just fine. Use check. It is available for many hosts from our archive server at archive-server@inmos-c.inmos.com. Send the single line help to get information. From: homeister@informatik.uni-stuttgart.de I had to solve two problems before I could use my C004. First: Check your link speeds. I often forget this and used the wrong link speeds (e.g. T414 10Mbit/s, C004 20Mbit/s). Second: the worm program tests sequentially link0, link1, etc. When It comes to your link 2, the bootcode the worm sends to the (expected) transputer at link 2 is received by the C004 and does something unexpected. In many cases the c004 is reprogrammed or hangs. In my case I had to write my own worm program that excludes testing the root transputer link with the c004 on the other side. Now my worm works fine. From: tfygan@cs.umu.se Hello Stephan, I think i know what's your problem is. Last summer I was playing around with a T800 and the tds. As i remember it, you can't use the worm if you have a c004 in your net. The reason is when the worm tests for the processortype it performs a poke and a peek command down the link. This data corrupts the c004. If you build a "Inhibit" switch on the control link to the c004 and load it with the correct network. If you then lock the link, the worm should work without problem. Another possibility, is to write a buffer for the T800, that you load before the worm, then it would just pass by, and ignore your master transputer. I haven't tested this, because my own interface is out of order and I haven't finished my c004 board. Tomorrow I will go to Oestersund for the summer. And for three months me and a friend will work on our transputer system. ( maybe a T9000 board :-)