Bit bang erial port and Xmodem

[Derek Cooper]

Hi all,

I have an SC114, by default it uses a bit bang serial port at 9600. It does support Hardware flow control.

It works fine as a terminal, I can upload text to it in the SCM monitor. For example I uploaded, as a hex file, Putsys for CP/M no problem. 

The download.com program seems to work ok, i've only tested small files so far.

However Xmodem is a complete waste of space! It never works. It just sits there and never exits. Sometimes you get lots of re-try packets on the sending PC.

Anything I'm doing wrong? Any suggestions?

Derek

[Phil G]

Have you tried a few ms character delay on the Terminal Derek?

[Derek Cooper]

Thank Phil,

I also posted in the retro-comp group (not sure the best place to ask for this one) and Bill Shen point me to a known issue in an old post, thanks to Bill I fixed the issue.

I have patched (botched!) the Console driver for bit bang 9600 to remove the issue of the NULL character being used to denote nothing received. 

Re-compile the PutSys hex file and installed it to my SC114

Success, I am now able to use Xmodem transfers for binary files etc exactly the same as the SIO card. I transferred a 200k file that was a ARC file of sc2 and it works fine.

I have attached the patched file for you to try.

I have also attached a version of PutSys, if you want to try it right away!

Have fun

Derek

ps do you think Steve would want this sent as a patch or something?

[Steve Cousins]

Hi Derek,

Thanks for the  patched code. I'll look to adding this in the next release. I should have fixed it myself but you know how time goes.

Steve