kms@ecsvax.UUCP (Ken Steele) (05/27/89)
There appears to be a bug in the xmodem checksum receive routine in
VT1002.8A. The symptoms are described below.
The amiga is the receiver. The sender is a SYM (a 6502 single
board). If the SYM goes into it's send routine (basically
sitting there looking for a NAK before beginning transmission)
before the receive command is issued on the amiga, then the transfer
works. But if you start the receive on the amiga before starting the
send on the SYM then there is no transfer. There is no trouble like
this when using another program such as Comm1.34.
The problem seems to be that when receive is first started, a NAK is
sent out. But NO other NAK's are sent out afterwards. My
understanding of the xmodem protocol is that the receiver should
continue to send out NAKs periodically for a very long time, as the
sender is looking for that prior to sending the first block.
Has anyone run into this problem? Or did I miss something?
--
Ken Steele Dept. of Psychology kms@ecsvax.[bitnet || UUCP]
Mars Hill College kms@ecsvax.uncecs.edu
Mars Hill, NC 28754 acs@pccuts.pcc.amdahl.com (Tony Sumrall) (05/31/89)
In article <7082@ecsvax.UUCP> kms@ecsvax.UUCP (Ken Steele) writes:
->There appears to be a bug in the xmodem checksum receive routine in
->VT1002.8A. The symptoms are described below.
-> ...
->The problem seems to be that when receive is first started, a NAK is
->sent out. But NO other NAK's are sent out afterwards. My
->understanding of the xmodem protocol is that the receiver should
->continue to send out NAKs periodically for a very long time, as the
->sender is looking for that prior to sending the first block.
->
->Has anyone run into this problem? Or did I miss something?
No one else has reported this problem. No, you didn't miss anything, it
appears that *I* did (i.e. it looks like a you have found a bug in the
XMODEM protocol implementation in 2.8A and prior versions). I'll fix it
2.9.
->Ken Steele Dept. of Psychology kms@ecsvax.[bitnet || UUCP]
-> Mars Hill College kms@ecsvax.uncecs.edu
-> Mars Hill, NC 28754
--
Tony Sumrall acs@pccuts.pcc.amdahl.com <=> amdahl!pccuts!acs
[ Opinions expressed herein are the author's and should not be construed
to reflect the views of Amdahl Corp. ]