tomwest@gpu.utcs.toronto.edu (Tom West) (02/27/87)
I am trying to write a terminal emulator for the 1040ST in Pascal. Unfortunately, the flow control (x-on/x-off) that comes with the Atari is no good. (Unless the user isn't allowed to use ctl-s/q in which case it would do.) To get around this, I have tried to implement flow control myself. The problem comes in that the record that contains the information about the receive buffer (found by doing an XBIOS(14)) seems to be defective. The record looks like tx_Bufptr : bufferPtr; tx_Bufsize : integer; tx_tail : integer; (The BIOS calls documentation reverses tx_head : integer; this, but it's irrelevant.) tx_lowWater : integer; tx_highWater : integer; rx_Bufptr : bufferPtr; rx_Bufsize : integer; rx_tail : integer; rx_head : integer; rx_lowWater : integer; rx_highWater : integer; Anyway, the problem is while the transmit (That's the ATARI transmitting to avoid confusion) seems to work (tx_tail and tx_head cycle around the buffer), the receive buffer seems to be dead. rx_tail and rx_head are ALWAYS 0, and the buffer seems to be all zeroes. Is there anyone else who has encountered similar problems and might know a way around them? Either email or if you think it's of general interest, post. Many thanks in advance. Tom West UUCP: {utzoo, utcsri, mnetor, cbosgd, ihnp4}!gpu.utcs!tomwest -- Tom West UUCP: {utzoo, utcsri, mnetor, cbosgd, ihnp4}!utcs!tomwest
tomwest@gpu.utcs.toronto.edu (Tom West) (03/03/87)
I posted an article a few days ago asking for help about ATARI RS232 buffering. Since then I have found that the mistakes were all on my side. My thanks to all who mailed a reply. Finding out that the interface worked for others enabled me to find the bug. -- Tom West UUCP: {utzoo, utcsri, mnetor, cbosgd, ihnp4}!utcs!tomwest