MMOON.ES@PARC-MAXC.ARPA (03/07/84)
You certain that an alignment problem exists? Do the drives perform the same warm as they do cold? Morrow's data seperator on my controller like most designs of two to three years ago-- uses a digital phase detector which is temperature dependent to a very high degree. This information comes from the close analysis of a friend doing circuit design for Western Digital. Also, which DJ2D are you running? The memory mapped version, the I/O mapped version *without* DMA, or the I/O version *with* DMA. Many of the non-DMA, I/O mapped controllers had layout errors on the board which were corrected via cut & jumper; my own had, I believe, six jumpers, but one pair of cuts had been left out. They turned out to be the triggers to the one-shots controlling the write-gate window for write pre-comp. Failure to make those cuts eventually cost me the 1791 controller. (Note that this board was purchased as-is with my full knowledge that design problems could exist. Very few if any of these were, to my understanding, sold without such information provided. Morrow enjoys my high regard.) My friend from Western Digital found the missing cuts & things seem to have settled down considerably. MMoon.es