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- For those who want to roll their own, here are the particulars on the
- V.42bis upgrade for the USR HST and Dual Standard modems...
-
- 1) You will need to download USR42BIS.ZIP from the database and use that
- to program a 27C512 Rom.
- 2) You will need to purchase a Sony CXK58257P-12L (or equivalent) Ram chip.
- 3) Install the Rom in the Supervisor (SUP) socket.
- 4) Install the Ram in the Ram socket.
- 5) Make up two 3 pin jumpers for P9 and P10 with pins 1 and 2 jumpered
- on one and pins 2 and 3 jumpered on the other. Connect the vacant pin 1
- on the one to the vacant pin 3 on the other with a jumper wire.
- 6) Remove the jumpers on P9 and P10.
- 7) Install the jumper with pins 1 and 2 connected together on P9.
- 8) Connect the jumper with pins 2 and 3 connected together on P10.
-
- That's it!
-