mlewis@unocss.unomaha.edu (mlewis) (09/26/90)
I recently acquired a Sierra Data Sciences SBC and system and have a
teeny tiny problem. There are two serial ports on teh board, clearly
marked as to which is a terminal port and which is the printer port.
The problem is that there is a largish number of jumper points directly
below the header on the board, which I must assume are there to configure
the port characteristics. I have no idea what the jumpers ought to look
like, and my clone won't talk to it, or vice versa. The monitor listing
implies I don't even need a disk to get the board talking, the jumpers
may have been set for some really bizaare terminal. My clone only requires
a three-wire with 6-8-20 jumpered to make my modem do its magic.
Dies ANYONE out there have a jumper layout for this beast? The PC traces
to the jumper block are not at all obvious, and my familiarity with a
Z-80 DUART is academic at best.
Thank much in advance.
Marc
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---------------------------------------------------------------------------tim@NCoast.ORG (Tim Stradtman) (09/28/90)
In article <3103@unocss.unomaha.edu> mlewis@unocss.unomaha.edu (mlewis) writes: > >I recently acquired a Sierra Data Sciences SBC and system and have a >teeny tiny problem. There are two serial ports on teh board, clearly >marked as to which is a terminal port and which is the printer port. >The problem is that there is a largish number of jumper points directly >below the header on the board, which I must assume are there to configure >the port characteristics. I have no idea what the jumpers ought to look >like, and my clone won't talk to it, or vice versa... The jumpers are setup so that you can swap 2/3 and 4/5, and play around with 6,8 and 20. In general, for a modem you want something like: o o o o o o o o o ! ! ! ! o o o o o o o o o You won't be able to follow the traces without an ohmeter, as some of them are on the inner layers of the board. If you want, I can send you the wiring. I'd send it now, but I don't remember it exactly... I used to work for SDS, and have a complete set of manuals available, as sell as a working 4 user system. Hope this helps Tim -- Tim Stradtman tim@ncoast.org or ak215@cleveland.freeent.edu