Harold, the 16C76 and 16C77 are basically `fat' versions of the 16C73
and 16C74. The '76/'77 have 8K of code space in 4 banks compared to 2K in
2 banks for the '74. The new chips also have 368 bytes of data memory
compared to 192 bytes. One unique feature in the '76/'77 is that the upper
16 bytes of data memory in banks 1, 2, and 3, are mapped to bank 0. So you
can use common variables in those locations without having to manipulate
the page select bits; RP0/RP1. Saving the context during an ISR is one
good use for those locations. Finally, the BRGH=1 `bug' has been fixed.

   Other than the 16 common memory locations and the need to keep track of
the extra PCLATH/RP1 bits, they are identical to the 16C73/74.

   - Tom

At 12:48 PM 9/23/97 EDT, you wrote:
>On Tue, 23 Sep 1997 09:23:19 -0600 Matt Bonner <mbonner@SUNADA.COM>
>writes:
>>Tjaart van der Walt wrote:
>>> I am considering migrating to the '77from the '74. Are there
>>> any 'undocumented features' that any of you have discovered on
>>> it?
>>You've probably already done this - you have to upgrade the Picstart
>>Plus firmware.  Tjaart - if you get any private responses to your
>>posting, could you copy me on them?  I am also in the process of
>>migrating from the 74A to the 77 (just got two 77 samples last week).
>
>
>        Now that I've got several products running on the 16c74a, what
>are the advantages of the 16c77?  (I know... I ottta just get out the
>databook!).
>
>Harold