Post by thread:[ot] Generating higher bit rates than 115200 on a

The UART used in most IBM PC compatibles (16550) and the associated circuitry only allow speeds up to 115,200 BPS. You will have a very difficult time going any higher. Even if you had a serial port capable of going higher, you would have to use special drivers for it, as windows assumes a 16550 or compatible, and doesn't have the ability to set higher speeds. Of course, you COULD use a PIC with a UART and the parallel port... -Adam Soren Knudsen wrote: > > I cant get the proggie to open my serial port at 128000/256000 baud. perhaps > its because its not standard? can anyone rewrite it to meet the standard > speeds as i think it could be quite usefull to me? > > Soren Knudsen

Win98 recognizes my 230bps-capable serial port. HyperTerm, of course, does not. Andy "M. Adam Davis" <spam_OUTadavisTakeThisOuTUBASICS.COM> on 05/11/2000 08:05:52 AM Please respond to pic microcontroller discussion list <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> To: PICLISTKILLspamMITVMA.MIT.EDU cc: (bcc: Andrew Kunz/TDI_NOTES) Subject: Re: [ot] Generating higher bit rates than 115200 on a PC The UART used in most IBM PC compatibles (16550) and the associated circuitry only allow speeds up to 115,200 BPS. You will have a very difficult time going any higher. Even if you had a serial port capable of going higher, you would have to use special drivers for it, as windows assumes a 16550 or compatible, and doesn't have the ability to set higher speeds. Of course, you COULD use a PIC with a UART and the parallel port... -Adam Soren Knudsen wrote: > > I cant get the proggie to open my serial port at 128000/256000 baud. perhaps > its because its not standard? can anyone rewrite it to meet the standard > speeds as i think it could be quite usefull to me? > > Soren Knudsen

I've said this before, but I can say it again. Buy one of those cheap serial cards with a 3.58 MHz colorburst crystal. Then replace the crystal with something a bit faster. We were using 160000 over a short distance for programming serial flash chips. The PC thinks it is running at a lower baud rate, thus it should work with hyperterminal. However, I haven't tried this under windows, only dos. Craig {Original Message removed}