On Nov 13, 2019, at 10:41, Nigel Johnson wrote: > > > On 13/11/2019 13:36, Chuck Guzis via cctalk wrote: >> There are other "oddball" combinations, such as 8E1 and 8O1, which sends >> a 9-bit data frame. You can see datasheets on some UARTs as well as MCU >> UARTs that support the 9 bit packet. > According to the diagram of the Smartmodem there is no UART, the 1488s and > 1489s go directly to the Z80.
Somebody has to do speed and word format sensing, to pull off something like the Smartmodem. Hayes Technical Reference pointed at earlier has a table of supported data word formats in section A.1.1, page A-2. Start bits, data bits, parity, stop bits 1, 7, even/odd, 1 or more 1, 7, none, 2 1, 7, mark/space, 1 or more 1, 8, none, 1 or more That’s all! -Frank McConnell
