|Re: hp 49g adapter|
Message #5 Posted by James M. Prange on 2 Nov 2003, 4:29 p.m.,
in response to message #4 by Francesc Casanellas
I hadn't considered the possibility that perhaps Steve hadn't removed an
adapter from the cable.
The 48 series (the "old" ones) uses a 4-pin connector for RS-232, and
you can also connect an overhead projector display unit by plugging it
into one of the expansion slots.
But the 49G doesn't have expansion slots; it uses a 10-pin connector for
both the RS-232 I/O and the display unit.
Note that you can physically connect a cable made for HP palmtops to the
49G, but don't try it; the display goes dark immediately and it may well
fry components in the 49G. Perhaps even more dangerous on 49Gs with
serial numbers starting with ID93 or lower; they had mistakes in the I/O
The earlier 49Gs came with a cable having a 10-pin connector on both
ends for connecting two 49Gs to each other, plus a 10-pin to 4-pin
adapter so you can connect a 49G to a 48 series calculator using the
same cable. If you asked for the "ROM update kit" or purchased a
"connectivity kit", you also got a 10-pin to DB-9 cable in the kit.
Later 49Gs added a 10-pin to DB-9 adapter in the package, so with that,
you can use the same cable to connect two 49Gs to each other, or with
one adapter connect to a 48 series, or with the other to any RS-232
device that uses a DB-9 connector.
If you happen to have two of the 10-pin to 4-pin adapters, the
calc-to-calc cable also works fine for connecting two 48 series
calculators to each other.