On Sep 5, 2018, at 10:35, Jim Brain <brain@jbrain.com> wrote: > >> I can't tell what the person who designed the chip was thinking, but it's rather telling that both commodore and apple don't appear to have been aware of it when they wrote their drivers. >> > Most people did not make the connection that 1.8432/16 = 115200. However, I think Commodore and Apple did understand. At the time the devices came out, 115200 was not a bps rate in general use, and line drivers at the time would have struggled to keep up and adhere to the standard. I also seem to recall that EIA relaxed the serial standard at some point to allow the higher speeds to comply with the signalling standard. Apple wanted to hit 230.4kbps for their networking over RS-422, so they probably were not as cavalier as Commodore. Justin --Apple-Mail=_92B17A00-820F-4AA0-98CE-37DC960EE6BC Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIILLzCCBUEw ggQpoAMCAQICEHfQVJ0Nnuqr+MwjV9hSJb8wDQYJKoZIhvcNAQELBQAwgZcxCzAJBgNVBAYTAkdC MRswGQYDVQQIExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoT EUNPTU9ETyBDQSBMaW1pdGVkMT0wOwYDVQQDEzRDT01PRE8gUlNBIENsaWVudCBBdXRoZW50aWNh dGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMB4XDTE4MDMyMTAwMDAwMFoXDTE5MDMyMTIzNTk1OVow LDEqMCgGCSqGSIb3DQEJARYbc2hhZG93QGRhcmtzaWRlcmVzZWFyY2guY29tMIIBIjANBgkqhkiG 9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3mfApG24aQAyIZkTRvNUc8hKjhVlfoKURhZDB/1d0lrpF09s 0BzfAe7bXclisZ9eqd8kG7KDIG1Ew++gGBZRbRzg20U1+3qUg3K8A013F/Oc7MIqHAIPsB+Z+aQU HtUIuYeDfpOaEHS7dbvmhFIbhoHd/9Mr+b/G64j4rcg9F4XQDLxm+5w9SkwlWX3SRdt+NVBgpm83 VwZyVH8YWNQ7puMm6D6WFwkUIWc5XYNST/FfFvI5sewXqe6EzN08HO9KYx5T70hbA168iYb0G47Z 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