2017-09-30 15:54:57 UTC
I have been using ADTPro 2.0.2 to transfer disk images to my real Disk II, and also have been making use of VSDrive a bit too. Hardware is Apple IIe (unenhanced - although that is about to change) with SSC.
In general it is a great experience and I have been able to transfer dozens of disk images successfully. Thanks so much to David Schmidt!
However I find that the transfer (and also VSDrive) is not completely reliable. Sometimes I can transfer entire floppy images successfully. Other times, the same image will terminate with a transfer error at some random point. After this has happened, the ADTPro client is usually in a bad state and all actions (eg: 'D'irectory) will result in HOST TIMEOUT. Generally restarting the Apple II and ADTPro client gets things working again. I don't usually have to restart the ADTPro server. I am running ADTPro server under Linux if that makes any difference.
I suspect the problem is a dropped character on RS232 somewhere. Not sure if that is an overrun on the client side or something internal to the SSC or the cheap RS232-USB converter I am using. The ADTPro trace log doesn't show anything very interesting.
Does anyone have any similar experiences? Is ADTPro totally reliable or is the odd issue like this to be expected at 115Kbaud?
I don't really care too much when transferring floppies, since usually two or three retries will do the trick. However it makes using VSDrive rather miserable.