bill rowe wrote:
Josh: does your serial code do autobaud - i forget? If so it would probably be fine.
No; it doesn't autobaud.
But there are two serial ports; one on the Z80-CPU board, and another on the Z80-SIO board.
The one on the CPU board uses the 4 MHz resonator; so it will still work. It is fixed at 9600 baud; but would be 4800 baud if you used a 2 MHz resonator, or 19200 if you used 8 MHz etc.
The 8250 UART on the Z80-SIO board uses the 1.8 MHz resonator. 18.432 MHz and 3.072 MHz happen to give you all the standard baud rates from 50-38.4Kbaud with negligible error. See the 8250/82C50/16C450 datasheet for details on how to calculate the baud rate constant for various frequencies.
Lee
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Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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