Problem with Xmodem on RS-232 port 1

[mmaseda12]

Trying to use Xmodem with IMSAI8080esp. Using tera-term connected to RS-232 port 1 I get the CP/M prompt fine but when I run Xmodem and try a transfer it just hangs. If I connect to RS-232 port 2 and run porta.sub and redirect the console to UC1 I get the CP/M prompt and Xmodem works fine. I have both RS-232 ports are configure the same. Any ideas?

Manuel

[mmaseda12]

Looking further I see there are some SIO parameters in the Xmodem.cfg file. I’m sure that’s my problem. I’ll report back with my findings.

Manuel

[udo-munk]

The first SIO used for the console is configured to strip parity and drop 0 bytes, because of some software sends text with parity set. xmodem is a 8 bit protocol, configure the first SIO same as the second, then it will work.

[mmaseda12]

Do I make this configuration change in Xmodem.cfg? I’ve already made the changes in the esp config files.

Manuel

[udo-munk]

In the ESP config files. A SIO used for datatransfers must be 8bit clean, most protocols require this.

[mmaseda12]

I previously made these changes but it didn’t seem to work. Is there anything else I need to change?

Manuel

Boot.cfg
UART0 = 115201 8N1

System.cfg

SIO 1 Channel A, Ports 2/3 connected to terminal (default)

sio1a_upper_case 0
sio1a_strip_parity 0
sio1a_drop_nulls 0
sio1a_baud_rate 115200

[udo-munk]

This is correct for 8bit data passing the SIO without any modifications. The baud rate might be much to high for data transfers over a physical TTY port, I won't use much more than 9600. Probably your SIO2A is set for that and this is why it works on that one.

[mmaseda12]

Setting to 9600 still doesn’t works. Since it’s working fine on the second port I I’ll just continue to use that. Thanks for your help.

Manuel

[udo-munk]

Running out of ideas, sorry. This should work with both TTY ports, they are not different inside the ESP. Cannot test this my self, I have no RS-232 equipment anymore, doing everything with USB nowadays.

[mmaseda12]

Udo,
I tested this with Z80pack on a Pi5. I used a serial console on the first serial port and configured it the same as I did on the ESP. It worked fine. Must be an issue with ESP. I’ve asked Dave to look into it but said I was in no rush since I could used the second serial port. Thanks again for your help.

Manuel