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YMODEM
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====1k==== 1024-byte packets had been introduced in XMODEM-1k.<ref name="meeks198902">{{Cite magazine |last=Meeks |first=Brock |date=February 1989 |title=The ABCs of X-, Y-, and ZMODEM |url=https://archive.org/details/eu_BYTE-1989-02_OCR/page/n217/mode/2up?view=theater |access-date=2024-10-08 |magazine=BYTE |pages=163-166}}</ref> This version did not change the trigger character from the receiver, so there was no way for the sender to know whether the receiver supported larger packets. Instead, XMODEM-1k was presented as a separate protocol on both ends of the connection. When such a connection was started, the sender could choose to send either 1024 bytes in a packet or 128, indicating the larger with an {{mono|STX}} character in the header rather than the normal {{mono|SOH}}. Normally only the last few packets would use the smaller packets, to avoid sending large amounts of padding. 1k also assumed CRC for all connections. YAM supported 1k with no changes.
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