Aucbvax.1557 fa.info-cpm utzoo!duke!mhtsa!eagle!ucbvax!W8SDZ@MIT-MC Mon Jun 8 00:15:32 1981 Using DC Hayes modem at 450 baud I picked up the following message from a remote CP/M system recently: According to the supplied literature of the D.C.Hayes MicroModem-100, it cannot be operated above 300 baud. The limiting factor is not the Uart or it clock frequency but the Microcoupler itself (according to its designer). Not accepting that their design was such that its upper limit was no higher than 300 I decided to experiment. If you replace the diodes that determine the 12-bit divider for the clock frequency to a decimal 17 - 00010001 - (I used a 16-pin socket and a removeable header), you can squeeze out 450 Baud. I couldn't get 600 baud, but the upper limit probably varies from unit to unit. If you wish you had a PMMI, give this a try. Anything is better than 300. Bob Loesch Bel Air, Md. (301) 879-7135 ----------------------------------------------------------------- gopher://quux.org/ conversion by John Goerzen of http://communication.ucsd.edu/A-News/ This Usenet Oldnews Archive article may be copied and distributed freely, provided: 1. There is no money collected for the text(s) of the articles. 2. The following notice remains appended to each copy: The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996 Bruce Jones, Henry Spencer, David Wiseman.