🚀 go-pugleaf

I've written a TSR that reads from the serial port and writes data to the
hard disk. The TSR only runs from the timer interrupt (0ch) when the 
"indos" flag is clear and the disk bios routine has not been entered (I have
my own flag to check), OR from the 28H interrupt. I carefully set and restore
the PSP, DTA, critial and ctrl-break int routines, and the ctrl-break flag
around the code. I use my own stack.

Now, when the system is heavily loaded by leaning on a key (I don't take
the keyboard over), and heavy disk use from the TSR (the serial port is 
running 9600baud, and data is being stored on the disk), often the system
will appear to "hang" for up to 30 seconds -- it is in the TSR, doing a
DOS disk request, and sitting in the Disk BIOS (the disk light is on, as
well). Then the system seems to recover and starts running again, with 
data loss from the serial port, of course, and an occasional, rare, disk
corruption :-(.

The situation is worsened by running on slower machines (one would expect
that).

Does anyone have any idea what's happening? And is there a cure?

Please reply direct to me. I'll summarize if requested.

Tom Almy
toma@sail.labs.tek.com
Standard Disclaimers Apply


-- 
Tom Almy
toma@sail.labs.tek.com
Standard Disclaimers Apply