Regarding maintenance of Motorola radios: I used to have a colleague in that business. He always kept an old PC with a legacy serial port (16C550A UART) running Windows 95 I believe. In those "pre-NT" Windows editions, DOS apps still had direct access to hardware, DOS style. I understand that some of the old maintenance apps for radio stations (in DOS) did require a standard physical UART (8250 or 16550 compatible).
I'd like to mention that DMP and ICOP still make x86 SoC's and motherboards that have legacy UART's (integrated on chip) as well as USB. I recall an obscure problem in some historical revision of the Vortex86 SoC silicon, in the UART, where the two baud divisor bytes had to be written in a particular order (not in reverse order) otherwise the baud didn't come out allright. I cannot quantify this more precisely (I don't have records). Someone has mentioned second-hand DELL PC's... I remember once meeting a Dell PC (during late naughties?) where the modem signals (DTR I guess) behaved pretty weird. The voltage was allright, but the sequencing was wrong. ICOP hardware might work for the speech synthesizer application too. Frank _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
