ZModem/XModem Source

 BBS: Inland Empire Archive
Date: 02-09-93 (19:27)             Number: 361
From: ZACK JONES                   Refer#: NONE
  To: FRANCOIS ROY                  Recvd: NO  
Subj: ZModem/XModem Source           Conf: (2) Quik_Bas

Howdy Francois!

Here's some more info about that *BREAK* signal - this is
courtesy of Dave Cleary:


 >A "break" signal is that state in which the comm port sends a steady
 >stream of the "break" character.  Here's a snippet of what Telix does,
 >in algorithmic form, when Ctrl_end is hit:
 >
 >        Get the value of the address of the UART's Line Control Reg.
 >        Turn off interrupts
 >        To turn on a break, OR the LCR with 01000000b
 >        To turn off a break, AND NOT the LCR with 01000000b
 >        Turn on interrupts

There is no need to disable and enable interrupts when sending a break.

OldLCR = INP(BaseAddr% + 3)
OUT BaseAddr% + 3, OldLCR OR &H40
'delay for more than one character period
OUT BaseAddr% + 3, OldLCR

That is all there is to it.

Later           Dave


Take Care, Zack Jones

--- GoldED 2.41.B1207+1536
 * Origin: Zack's Shack San Antonio TX (210) 653-2115 (1:387/641)