Date   : Fri, 26 May 2006 09:18:34 +0200
From   : Eelco Huininga <eelco@...>
Subject: Re: Status Bits on BBC Micro RS423 port

&FE08 maps to the 6850's status register. The status bits are:

bit 0: RDRF Receive Data Register Full
bit 1: TDRE Transmit Data Register Empty
bit 2: DCD Data Carrier Detect
bit 3: CTS Clear To Send
bit 4: FE Framing Error
bit 5: OVRN Receiver Overrun
bit 6: PE Parity Error
bit 7: IRQ Interrupt Request

A more detailed description of the 6850's status register can be found in
the 6850's datasheet or in the Advanced User Guide on page 389.

Cheers,
Eelco



Graham/Carole Caulton wrote:
> I have an application on my BBC Micro that uses a teletext adaptor to 
> send information to my PC. Under windows xp this is playing up. Does 
> anyone have a definition for the status bits at &FE08 (the RS423 port) 
> which will help me sort out the problem.