LeechModem was compatible with protocols like XMODEM ( and YMODEM ), but it would mischievously NAK the last packet and then abort the file transfer.
32.
If the packet number was missing, it was assumed it was sending to a non-SEAlink XMODEM, and set the window size to one.
33.
If no packet was forthcoming, the receiver assumed the sender did not know the protocol, and sent an to start a " traditional " XMODEM transfer.
34.
Unlike the predominant protocols of the day ( XMODEM, YMODEM, ZMODEM ), BiModem allowed BBS users to upload and download files at the same time.
35.
If the sender responded by sending a packet, it was assumed the sender " knew " XMODEM-CRC, and the receiver continued sending C's.
36.
It features 40-and 80-column displays, XMODEM file transfers, ASCII / PETSCII conversion, direct display of freely redistributable for non-commercial use.
37.
ProTERM was rich in features such as an extensive " scrollback " Kermit and Xmodem to Ymodem ( Batch, 4K and G ) and Zmodem ( Batch Selections ).
38.
On the downside, BLAST was criticized by XMODEM developer Chuck Forsberg because of its proprietary nature, making it " tightly bound to the fortunes of [ its supplier ] ".
39.
A backwards compatible extensions of XMODEM with 32k and 64k block lengths was created by Adontec for better performance on high-speed error free connections like ISDN or TCP / IP networks.
40.
On the receiver side, all that was required was that the receiver send back the packet number ( contained in all XMODEM packets ) along with the normal ACK or NAK character.
