On Thu, 3 May 2001, Nate Dannenberg wrote: > > The only problem is maybe the lengh of the busses. We cannot equip this slot > > expander with buffers as we have no means to tell when the buffer should be > > activated and, more important, in what direction. > > Use bus transceivers. These are bi-directional buffers of a sort, with a > Read/Write direction line, which could be tied to the computer's R//W > line. Cartridges use this line of course, to sense read/write operations, > and so the transceivers should, too. As I understand it, the propagation > delay across these things is tiny enough to be of no real concern. This > type of buffer/transceiver has an Output Enable line as well if I remember > right, which of course could just be tied active for most lines, such as > the address and data busses, the clock lines, and so on. > > These little guys have a place in the Power SID project I'm trying to > build (never seem to find the time), and are there to elimiate some of the > noise the SID picks up from the rest of the bus when it's de-selected. > > David: what was the part number for those transceivers you suggested for > PowerSID? I don't have the plans handy. It's the same setup as in the vic20. Two unidirectional buffers , and one bidirectional for the data lines. 74ls244/74ls245. My book isnt available atm :( - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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