13 Nov
2019
13 Nov
'19
7:39 p.m.
On Nov 13, 2019, at 10:41, Nigel Johnson wrote:
On 13/11/2019 13:36, Chuck Guzis via cctalk wrote:
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
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.