#28 ymodem fails on error

[Anonymous]

I have tried several versions of zbox from the earliest I
could find up to .030. I have found that ymodem send
works perfectly as long as there is no error.
BUT if there is an error then the receiver sends the NAK
and this is received ok but zboxz sends the next packet
instead of resending the LAST packet.
This is not a problem if the receiver is fast and the line is
good.
BUT this is a problem if the line is poor or the receiver is
slow.

I have been able to simulate this condition by
momentarily dropping the line during transfer.
Subsequent naks are treated correctly so that wrong
packet does not keep incrementing.

By the way, thanx for a great program. This works great
when talking to my PC. BUT it usually fails when I am
using it with my old OS-9 devices.

[Nobody/Anonymous]

Logged In: NO

phaeton, are you aware of this problem?
Is this part of the buffer overrun problem??