Sc126 and KERMIT... seems to be difficult

[ITSecurity Guy]

Hi, using "minicom" (on a Linux system) and the SC126 via FTDI Serial Connection is not really a secret, and XModem works (although I had to use RTS/CTS flow control with 115200 Baud).

With the same connection, I was not able to use the Kermit protocol, not with "minicom" and KERCPM3 (generic Kermit for CP/M 3.0) and not with Tera Term (and of course a Windows PC).

I already tried to reduce the baud rate, but it does not help.

Is it possible to use the Kermit protocol with a 2nd FTDI Serial Connector (named "Serial B") ? Or must I even use an additional SIO card (hopefully not) ?

I've read the 2nd serial connector does not support RTS/CTS flow control, is that true ?

Thanks for any hint related with the SC126 and the Kermit protocol ;-)

[Richard Deane]

I use Kermit occasionally, and have the SC126 and SC131. 

On a default romwbw build, console is on port A with HW handshaking,  the Z180 second serial port DOES NOT have HW handshaking.

Kermit will not work across the active console connection (but xmodem can). I think kercpm3 will default to lst so use device command to define LST to port B. I do not think that Kermit requires hardware handshaking.

There is a simple change & rom rebuild  (well it was when I did it a year or so ago, but I can't remember the tweak in the bios source) what will swap ROMWBW to use second port for A and the first port for B if you really need handshaking on B to get kermit working.

I used real kermit on windows  (https://www.kermitproject.org/k95.html).

Hope this helps

Cheers

Richard

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[Steve Clarke]

I use kermit regularly on my SC130 running CP/M 3. I have ckermit on my linux desktop. Using the second serial port is entirely possible with some speed limitations due to the lack of rts/cts. I find 9600 is 100% rock solid, but have had success up to 19,200 with the z180's cpu speed increased.  

On the SC130: 

mode com1 9600 

device AUX:=com1

kerm3vt

set flow off

connect

On the PC:

ckermit

set line /dev/ttyUSB0
set modem none
set speed 9600
set carrier-watch off
send <file>

It's not quick but it does work.

[Steve Clarke]

Actually, I made a mistake. I can run up to 38400 baud with the standard 18Mhz cpu clock.