4 Oct
2015
4 Oct
'15
10:22 p.m.
The other is the 11/05S schematic, which shows
the later boards with
the crystal UART clock
Say what? The "11/05S schematic" from Bitsavers shows the RC clock; look on
page 61, bottom left corner, there's an RC circuit (and a couple of flops)
producing an output "DPH TTY CLK (I) H", which is fed into the baud rate
divider in the upper left corner. (Ooooh, what an ugly circuit! You have to tweak the
trim pot to change from
the 110/220/440/880/1760 speed set to the 150/300/600/1200/2400! Ugly!!)
May be easier than finding the right crystal to change a DL11A-E to the
'other' set of baud rates :-)
-tony
Noel