It looks like the T200 puts the 82c51 into async x16 at address 8713h in the rom. (out C8 where a =4Eh
clock has to be 5x faster in this mode, so for 76800 we'd need a clock rate of 76800x16x5 = 6.144MHz. clearly.. not going to work. However if we put the 82c51 into x1 mode it could work. I think the sequence is something like mvi a,40h out C8h -- reset the chip mvi a,4D - 1 stop bit, no parity, 8 bits, 1x mode one would still have to set the clock divider registers separately.
