Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!att!lzaz!hcj
From: hcj@lzaz.ATT.COM (HC Johnson)
Newsgroups: comp.os.minix
Subject: Re: ST RS232 Kernel problems
Summary: you have old files
Keywords: ST RS232
Message-ID: <662@lzaz.ATT.COM>
Date: 28 Jun 89 18:15:23 GMT
References: <2015@qfdts.OZ>
Organization: AT&T ISL Lincroft NJ USA
Lines: 47

In article <2015@qfdts.OZ>, kas@qfdts.OZ (Kas Sommers) writes:
> 
> 
> 1. Attatching another computer running a terminal emulator to the ST serial port
>    and changing /etc/ttys putting a second line reading 101
> 
> I attempted a login....
> Only garbage echoed from minix
> Removing the IOCTL lines from login.c and recompiling this program allows me to
> 
> cat file >/dev/tty1  results in a listing not well aligned vertically and the
> last X ( I think probably 256 chars ) missing
> 
> 
> 2.  cat file >/dev/fd0  is broken  ( Disk I/O error )
>     tos -r /dev/fd0 file      fails also
>  
>     cat file >/dev/rfd0      works
from the author of the changes:
1. looks like you have both old files and incomplete ones.
yes, login.c was changed.  dont thro out the ioctl, add ispeed=ospeed=B2400
or  whatever you are using.

2. there are problems with the speed being changed to 0 (B19200) at unexpected
times because there are programs that need to be relinked with the new ioctl
for libc.

3. there are speed problems above 4800 baud.  MINIX turns the interrupt off
for too long in places and a character gets lost.  should mess up listings
somewhat.
4. the improvement to floppy disk has a bug in the RDAFTERWT code.
change the buffer size to 512.  OR turn off that feature (it is local
to the stfloppy.c file.
5. cat>/dev/tty1 is probably a buffer overrun on the receiving side.
You may have inadvertently turned off xoff.xon at the driver level.

Finally.  These changes make a LARGE kernel.  strange things happen
with the 4 different versions of cv that are out there.
1. original cv.  it just silently breaks things as kernel grows.
2. fixed cv.  Noisily breaks things.
3. refixed cv.  just broken
4. latest cv, with source:  USE IT.

Howard C. Johnson
ATT Bell Labs
att!lzaz!hcj
hcj@lzaz.att.com